The gravitational force of a star on an orbiting planet 1 is f1. planet 2, which is four times as massive as planet 1 and orbits at three times larger distance from the star, experiences gravitational force f2

Answers

Answer 1

Final answer:

The gravitational force on Planet 2, which is four times more massive but orbits at three times the distance from a star compared to Planet 1, would be 4/9 of the gravitational force on Planet 1, according to Newton's law of universal gravitation.

Explanation:

The question pertains to the gravitational force exerted by a star on two different planets in orbit. According to the provided scenario, Planet 1 experiences a gravitational force denoted as f1. Planet 2 is four times as massive as Planet 1 and orbits at a distance that is three times larger from the star, resulting in gravitational force f2. To compare f1 and f2, one can use Newton's law of universal gravitation, which states that the force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. For Planet 2, which has four times the mass (4M), but is at three times the distance (3d), the force of gravity, f2, can be calculated as follows:

f2 = (G * (4M) * M_star) / (3d)^2 = (4/9) * (G * M * M_star) / d^2

Where:

G represents the gravitational constant

M is the mass of Planet 1

M_star is the mass of the star

d is the original distance between Planet 1 and the star

Comparing f2 with f1, which is (G * M * M_star) / d^2, it becomes clear that f2 = (4/9)f1. Therefore, the gravitational force acting on Planet 2 is 4/9 that of the gravitational force acting on Planet 1.


Related Questions

A bowling ball leaves a bowlers hand. An accelerometer inside the ball reads zero. Which of the following best describes what happens to the ball

Answers

It says 0 so it must mean the ball stopped moving meaning he must have put it on a table or something, thats what I think at least. 

Seagulls are often observed dropping clams and other shellfish from a height to the rocks below, as a mean of opening the shells. If a seagull drops a shell from rest at a height of 14.0m, how fast is the shell moving when it hits the rocks?

Answers

This is free fall with initial speed zero under the acceleration of gravity [tex]g[/tex]
We apply the equation 
[tex]v^2=v_0^2+2a*s[/tex]
rewritten as
[tex]v^2=2gh[/tex]
From this we find the sspeed of the shell as
[tex]v= \sqrt{2*9.81*14}=16.57 (m/s) [/tex]

Final answer:

The shell dropped by the seagull would be moving at a speed of approximately 16.7 m/s when it hits the ground. This calculation is based on the physics concept of final velocity in a free-fall motion.

Explanation:

In this scenario, the concept of kinematics, an aspect of Physics, will be employed. Particularly, we'll be focusing on free fall motion. The speed of the shell just before hitting the ground can be calculated using the equation for the final velocity in free fall: v = √(2gs) where v is the final velocity, g is the acceleration due to gravity (approximately 9.81 m/s² on Earth), and s is the height from which the object is dropped.

Substituting the given values (s = 14.0m, g = 9.81m/s²) into the equation, the calculation should look like this:

v = √(2*9.81*14.0) ≈ 16.7 m/s

So, the shell should be moving at approximately 16.7 m/s when it hits the rocks below.

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Explain how to identify a starting position on a line.

Answers

a fully shaded bubble with a line going right.

Sample Response: Pick a reference point on the line to be the zero position. Determine the direction and measure the distance from zero in standard units.

-The reference point is set on the line.

-The distance from that reference point can be used to describe movement.

-Standard units of measurement can be used to identify the distance from the reference point.

The total volume of hydrogen gas needed to fill the hindenburg was 2.09 × 108 l at 1.00 atm and 25.1°
c. how much energy was evolved when it burned?

Answers

Final answer:

The energy released from the burning of the Hindenburg's hydrogen can be calculated using Einstein's theory of relativity and the mass of hydrogen converted into helium. However, actual values may vary.

Explanation:

To answer your question, we need to calculate the amount of energy produced when hydrogen is converted into helium. From the provided reference, when 1 kilogram of hydrogen is converted into helium, the mass of the helium is only 0.9929 kilogram, and 0.0071 kilogram of material is converted into energy. This conversion is guided by Einstein's theory of relativity, which states that energy equals mass times the speed of light squared. So, the energy released by the conversion of just 1 kilogram of hydrogen into helium can be calculated using the formula E=mc² (where 'm' is mass and 'c' is the speed of light). Therefore, applying the numbers, the energy evolved would be 0.0071 kg * (3 * 10⁸ m/s)². However, please note that real-world values can be different due to various factors like loss of gas, incomplete reaction, etc.

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The energy of [tex]\( 2.45 \times 10^9 \text{ kJ} \)[/tex] is evolved when the hydrogen gas is used to fill the Hindenburg.

To calculate the energy evolved when the hydrogen gas used to fill the Hindenburg burned, we need to know the combustion reaction and the energy released per mole of hydrogen gas.

The combustion reaction of hydrogen gas is:

[tex]\[ 2H_2(g) + O_2(g) \rightarrow 2H_2O(g) \][/tex]

The enthalpy change [tex](\(\Delta H\))[/tex] for this reaction is approximately [tex]\(-286 \text{ kJ/mol}\) of \(H_2\)[/tex].

Using the ideal gas law PV = nRT to find the number of moles (n) of [tex]\(H_2\)[/tex]:

P = 1.00 atm

[tex]\[ V = 2.09 \times 10^8 \text{ L} \][/tex]

[tex]\[ R = 0.0821 \text{ L} \cdot \text{atm} / \text{mol} \cdot \text{K} \][/tex]

T = 298.25 K

[tex]\[ n = \frac{PV}{RT} \][/tex]

[tex]\[ n = \frac{(1.00 \text{ atm})(2.09 \times 10^8 \text{ L})}{(0.0821 \text{ L} \cdot \text{atm} / \text{mol} \cdot \text{K})(298.25 \text{ K})} \][/tex]

[tex]\[ n = \frac{2.09 \times 10^8}{24.45} \][/tex]

[tex]\[ n \approx 8.55 \times 10^6 \text{ moles} \][/tex]

Now, calculate the total energy evolved when this amount of hydrogen burns:

[tex]\[ \text{Energy evolved} = n \times \Delta H \][/tex]

[tex]\[ \text{Energy evolved} = (8.55 \times 10^6 \text{ moles}) \times (-286 \text{ kJ/mol}) \][/tex]

[tex]\[ \text{Energy evolved} = -2.45 \times 10^9 \text{ kJ} \][/tex]

The negative sign indicates that energy is released, so the total energy evolved is [tex]\[ 2.45 \times 10^9 \text{ kJ} \][/tex].

A 25 n box is pulled across a frictionless surface by an applied force of 22 n. the coefficient of kinetic friction between the box and the surface is 0.3. find the acceleration of the box. use g = 10 m/s2 .

Answers

Final answer:

The acceleration of the box is -2.12 m/s^2.

Explanation:

To find the acceleration of the box, we need to calculate the net force acting on it. The net force is the difference between the applied force and the force of kinetic friction. The force of kinetic friction can be calculated by multiplying the coefficient of kinetic friction by the normal force, which is the weight of the box. The weight of the box is mass multiplied by the acceleration due to gravity. With this information, we can plug in the given values and calculate the acceleration.



Calculate the weight of the box. Weight = mass x acceleration due to gravity. Given that the mass of the box is 25 N, and acceleration due to gravity is 10 m/s2, the weight of the box is 25 N x 10 m/s2 = 250 N.Calculate the force of kinetic friction. Force of kinetic friction = coefficient of kinetic friction x weight of the box. Given that the coefficient of kinetic friction is 0.3 and the weight of the box is 250 N, the force of kinetic friction is 0.3 x 250 N = 75 N.Calculate the net force. Net force = applied force - force of kinetic friction. Given that the applied force is 22 N and the force of kinetic friction is 75 N, the net force is 22 N - 75 N = -53 N (negative because the force of kinetic friction opposes the motion).Calculate the acceleration. Acceleration = net force / mass. Given that the net force is -53 N and the mass is 25 N, the acceleration is -53 N / 25 N = -2.12 m/s2. Since the acceleration is negative, it means that the box is slowing down.

Therefore, the acceleration of the box is -2.12 m/s2.

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Final answer:

To find the acceleration of the box, you subtract the frictional force from the applied force, then divide by the box's mass. In this case, the acceleration is found to be 5.8 m/s².

Explanation:

To find the acceleration of the box, we need to apply Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In this case, the net force is the applied force minus the force of friction. Given the normal force (created by the box's weight) is 25 N, the force of friction would be the coefficient of kinetic friction (0.3) multiplied by the normal force. That equals 0.3 * 25 = 7.5N.

Then, the net force is the applied force (22 N) minus this frictional force: 22 - 7.5 = 14.5 N. Since force equals mass times acceleration (F = ma), you can find the acceleration (a) by dividing the net force by the mass. Remember that the mass should be calculated by dividing the weight by gravitational acceleration (m = N/g). The mass is 2.5 kg. Therefore, the acceleration (a) would be F/m = 14.5 N divided by 2.5 kg= 5.8 m/s².

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do all protostars become stars?

Answers

Final answer:

A protostar, an early stage of stellar evolution, does not always become a star. It depends on the mass of the protostar. Protostars with enough mass become stars by successfully starting nuclear fusion, while those with lower mass may become brown dwarfs.

Explanation:

In the field of Astronomy, a protostar refers to the early stage of stellar evolution, a dense area in a molecular cloud where a star begins to form. Not all protostars successfully become stars. The evolution of a protostar into a star is largely dependent on the mass of the protostar. If the protostar has enough mass, it will continue to condense and heat up until it begins nuclear fusion, and officially becomes a star. If the protostar doesn't have enough mass, it may instead become a brown dwarf - a type of sub-stellar object that is too low in mass to sustain nuclear fusion in its core.

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Final answer:

Not all protostars become stars. Protostars with enough mass ignite nuclear fusion of hydrogen and become main sequence stars, while lower mass protostars that can't sustain hydrogen fusion become brown dwarfs, a category between planets and stars.

Explanation:

In the context of stellar evolution, not all protostars necessarily become stars in the traditional sense. Protostars are essentially young stars in the process of formation, a phase that sees impressive contraction and accumulation of dust and gas from their environment. This process notably generates heat and infrared radiation. However, the endpoint of a protostar's journey relies much on its mass.

If the protostar accretes enough matter to increase its core temperature and trigger nuclear fusion of hydrogen, it successfully becomes a main sequence star which is commonly referred to as a 'star'. In fact, our very own Sun went through this stellar development path. Otherwise, if a protostar lacks sufficient mass to instigate hydrogen fusion, it ends up becoming a 'failed star' known as a brown dwarf. Brown dwarfs are objects that straddle the line between planet and star, with some characteristics of both.

To elaborate, as a protostar collapses under its own gravity, it radiates away its heat, shrinking and becoming denser until its core becomes hot enough to trigger nuclear fusion, turning hydrogen into helium. If the mass is there, this fusion process will continue, and a star is born. If the mass isn't sufficient, nuclear fusion won't occur and thus, a brown dwarf is formed.

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A car with a mass of 2500 kg accelerates when the traffic light turns green. If the net force on the car is 5000 Newton’s, what is the car’s acceleration?

Answers

a=Fnet/m
a=5000N/2500kg
a= 2 m/s^2 (meters per second squared)

Final answer:

The car's acceleration can be calculated using Newton's second law of motion, which states that force is equal to mass multiplied by acceleration. By rearranging the formula, we can find the car's acceleration to be 2 m/s².

Explanation:

The acceleration of a car can be calculated using Newton's second law of motion, which states that force is equal to mass multiplied by acceleration (F = ma). In this case, the net force acting on the car is 5000 N and the mass of the car is 2500 kg. Using the formula, we can rearrange it to solve for acceleration:

a = F / m

Substituting the given values, we have:
a = 5000 N / 2500 kg

Simplifying the equation gives:
a = 2 m/s²

Therefore, the car's acceleration is 2 m/s².

Is the arctic ocean larger than the indian ocean?

Answers

The Arctic Ocean is the smallest ocean. It is more than five times smaller than Indian and Atlantic Oceans.

Barometer is taken from the base to the top of a 279-m tower. assuming the density of air is 1.29 kg/m3, what is the measured change in pressure?

Answers

Answer : P = 3527 Pa Explanation: Given : height, h = 279 m and density of air , Ď = 1.29 kg/m3 Change in pressure , P = h*Ď*g We know that gravity, g = 9.8 m/s2 Therefore P = 279 * 1.29 * 9.8 = 3527 Pa
Final answer:

To determine the change in atmospheric pressure, apply the formula for hydrostatic pressure, p = hdg, where h is height (279m), d is air density (1.29 kg/m³), and g is acceleration due to gravity (9.81 m/s²). The product gives you the change in pressure in Pascals (Pa).

Explanation:

The calculation of the change in pressure as the barometer is taken from the base to the top of the 279m tower involves using the formula for hydrostatic pressure. This formula is given by p = hdg, where h is the height of the fluid column, d is the fluid density and g is the acceleration due to gravity. In this case, the fluid is air.

Given that the density (d) of air is approximately 1.29 kg/m³, the height of the tower (h) is 279 m, and g (the acceleration due to gravity) is 9.81 m/s², you would calculate the change in pressure by simply plugging these values into the formula: p = 1.29 kg/m³ * 279 m * 9.81 m/s². Once you have multiplied these numbers together, the answer will give you the change in atmospheric pressure in Pascals (Pa).

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How would a 50 percent increase in earth's albedo impact average surface temperatures?

Answers

Ice sheets would advance, thereby increasing earth's overall albedo and further cooling earth's surface.

How long does it take for tylenol to work?

Answers

If you take Tylenol on an empty stomach, it starts to work within 15 to 20 minutes. On the other hand, if you are taking Tylenol when your stomach is full, it takes about 30 to 60 minutes to work.

Potential energy
a. transfers motion to matter.
b. is stored energy unavailable to do work.
c. is kinetic energy that has not yet been turned to heat.
d. contains less energy than kinetic energy.
e. is contained in matter placed in certain positions or arrangements.

Answers

the answer would be B.

How long does it take for an obituary to appear?

Answers

24hours is the correct answer
If they have to do an autopsy then it can take a while (week) otherwise if he died late on Sept 5th then it would take probably 2 days before the notice would be in the Obits. Other than that you can go to the web sites of Funeral homes in the area where he lived and look up the death notices and he should be on there. Did you try all of the newspapers in your area. Just go on line to save time. Some families are so shocked at the death that they don't publish it until later or have a quiet funeral with immediate family and then after have a memorial where anyone can speak about the decease.

The refractive index of medium A is 1.54 and that of medium B is 2.12. Which statement is correct about this information?

Answers

the statement that is correct about this information is a ray of light passing from medium A to B will bend toward the normal.

Answer:

A ray of light passing from medium A to B will bend toward the normal.

Explanation: Plato user

Ryan and Becca are moving a folding table out of the sunlight. A cup of lemonade, with the message 0.44 kg is on the table. Becca lifts her end of the table before Ryan does, as a result, the table makes an angle of 150.0° with the horizontal. Find the components of the cups weight that are parallel and perpendicular to the plane of the table

Answers

Calculate the weight of the table through the equation,

   W = mg

where W is the weight, m is the mass, and g is the acceleration due to gravity. Substituting the known values,
   W = (0.44 kg)(9.8 m/s²) 
   W = 4.312 N

The components of this weight can be calculated through the equation,

   Wx = W(sin θ) 

and Wy = W(cos θ)

x - component:
   Wx = W(sin θ)
Substituting,
  Wx = (4.312 N)(sin 150°) = 2.156 N

  Wy = (4.312 N)(cos 150°) = -3.734 N
Final answer:

The components of the cup's weight that are parallel and perpendicular to the plane of the table can be found using trigonometry.

Explanation:

The magnitude of the component of the weight parallel to the slope is w|| = w*sin(25°) = mg*sin(25°), and the magnitude of the component of the weight perpendicular to the slope is w1 = w*cos(25°) = mg*cos(25°).

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Think Critically:
A lightbulb converts 10 percent of the electrical energy it uses into radiant energy. Make a hypothesis about the other form of energy produced.

Answers

Plants Almost 90 percent of the electrical

energy generated in the United States is produced by Oil

nuclear and fossil fuel power plants, as shown in 3%

Figure 15. Other types of power plants include hydro- Coal Gas
51%
electric (hi droh ih LEK trihk) and wind. Hydroelec- 14%

tric power plants transform the kinetic energy of Hydro
moving water into electrical energy. Wind power 9%
plants transform the kinetic energy of moving air into
electrical energy. In these power plants, a generator Nuclear Other
converts the kinetic energy of moving water or wind 20% renewable
3%

to electrical energy.

To analyze the energy transformations in a power

plant, you can diagram the energy changes using arrows. A coal- Figure 15 The graph shows

burning power plant generates electrical energy through the fol- sources of electrical energy in the

lowing series of energy transformations. United States.

chemical thermal kinetic kinetic electrical Name the energy source that you
energy → energy → energy → energy → energy think is being used to provide the
electricity for the lights overhead.
of coal of water of steam of turbine out of

generator

Nuclear power plants use a similar series of transformations.
Hydroelectric plants, however, skip the steps that change water
into steam because the water strikes the turbine directly.

Summary Self Check

Changing Forms of Energy 1. Describe the conversions between potential and
kinetic energy that occur when you shoot a basketball
• Heat usually is one of the forms of energy pro- at a basket.
duced in energy transformations.
2. Explain whether your body gains or loses thermal
• The law of conservation of energy states that energy if your body temperature is 37°C and the
energy cannot be created or destroyed; it can temperature around you is 25°C.

only change form. 3. Describe a process that converts chemical energy to
thermal energy.
• The total energy doesn’t change when an
energy transformation occurs. 4. Think Critically A lightbulb converts 10 percent of
the electrical energy it uses into radiant energy.
• As an object rises and falls, kinetic and poten- Make a hypothesis about the other form of energy
tial energy are transformed into each other, produced.

but the total energy doesn’t change. 5. Use a Ratio How many times greater is the amount of
electrical energy produced in the United States by
Generating Electrical Energy coal-burning power plants than the amount produced
by nuclear power plants?
• A generator converts kinetic energy into elec-
trical energy.

• Burning fossil fuels produces thermal energy
that is used to boil water and produce steam.

• In a power plant, steam is used to spin a tur-
bine which then spins an electric generator.

Answer:

When you touch a light bulb, you can notice that the lightbulb is actually really hot. This is because some of the energy that reaches the lightbulb is transformed into heat, if 10% of the electrical energy is used to make radiant energy (light ) then the other 90% is dissipated as heat.

a cannonball with a mass of 1.0 kilogram is fired horizontally from a 500.- kilogram cannon, initially at rest, on a horizontal, frictionless surface. The cannonball is acted on by an average force of 8.0x10^3 newtons for 1.0x10^-1 second. (a) What is the magnitude of the average net force acting on the cannon? (b) Determine the acceleration of the cannon ball.

Answers

In this exercise we will use the knowledge of Newton's laws to be able to answer about the force, in this way:

A) opposite direction to the movement.

B) a = 8,000 m/s^2

So, recalling Newton's concept of force, we have:

One newton corresponds to the force exerted on a body of mass equal to 1 kg that induces an acceleration of 1 m/s² in the same direction as the force.

A)The magnitude of a force is linked to its direction, so we will have that force is in the opposite direction to the movement.

B) We solve this using the formula:

[tex]F = m a\\8.0*10^3 N = (1.0 kg) a\\a = 8,000 m/s^2[/tex]

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The mixture you separated was a mixture of iron filings, sand, and salt. Based on your understanding of matter, is this mixture a homogenous mixture or heterogenous mixture? How do you know? Question 1 options: homogenous mixture-the parts are uniformly mixed homogenous mixture-the parts are not uniformly mixed heterogenous mixture-the parts are not uniformly mixed heterogenous mixture-the parts are uniformly mixed

Answers

This would be a heterogenous mixture. Nothing was dissolved in anything else. The things could not have been mixed completely evenly because of their different weights and densities. Homogenous mixtures are usually solutions where one thing is dissolved in another and can't be easily separated out by hand.

Answer: Heterogeneous mixture - the parts are not uniformly mixed.

A mixture contains components having distinct chemical properties. There are two types of mixtures: homogeneous and heterogeneous. In a homogeneous mixture there is uniform distribution of components. we cannot distinguish one portion of the mixture from another. for example salt mixed in water. In heterogeneous mixture, the components are not uniformly mixed. hence, we are able to distinguish different parts of a mixture, like the mixture of iron, sand and salt given in this question.

In a chemical reaction sodium and chlorine react to form sodium chloride.

Which term names the sodium?

A.an ion

B.an electron

C.a product

D.a reactant

Answers

Sodium is D. a reactant

Answer:

The answer is D) A Reactant!

Explanation:

The answer is D because just like water, salt is made up of two different components. Making it a reactant!

How does speed affect the friction between a road and a skidding tire?

Answers

speed does not affect friction, friction affects force

A car traveling in a straight line at an initial speed of 8.0 meters per second accelerates uniformly to a speed of 14 meters per second over a distance of 44 meters. What is the magnitude of the acceleration of the car?

Answers

The equation we can use here is:

v^2 = v0^2 + 2 a d

where v is final velocity, v0 is intial velocity, a is acceleration and d is distance

 

14^2 = 8^2 + 2 a (44)

a = 1.5 m/s^2

The acceleration of the car travelling in a straight line is [tex]\fbox{\begin\\1.5\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{{{\text{s}}^{\text{2}}}}}}\right.\kern-\nulldelimiterspace}{{{\text{s}}^{\text{2}}}}}\end{minispace}}[/tex].

Further Explanation:

A car travelling in a straight line with a constant uniform acceleration will always follow the Newton’s law of motion.

Given:

The initial velocity of the car is [tex]8\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{\text{s}}}}\right.\kern-\nulldelimiterspace}{\text{s}}}[/tex].

The final velocity of the car is [tex]14\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{\text{s}}}}\right.\kern-\nulldelimiterspace}{\text{s}}}[/tex].

The total distance covered by the car is [tex]44\,{\text{m}}[/tex].

Concept:

The car is following the Newton’s law of motion. As per the Newton's laws of motion, the motion of a body is governed by the three equations of motion.

To calculate the uniform acceleration of car when initial velocity, final velocity, and distance covered by car given, the equation of motion we can use here is:

[tex]\fbox{\begin\\v^2 = {u^2} + 2as\end{minispace}}[/tex]

Rearrange the above equation for value of acceleration :

[tex]a=\dfrac{{{v^2}-{u^2}}}{{2s}}[/tex]

Here, [tex]s[/tex] is the distance covered by car, [tex]u[/tex] is the given initial velocity of the car, [tex]v[/tex] is the given final velocity of the car and [tex]a[/tex] is the acceleration of the car.

Substitute [tex]14\,{{\text{m}} \mathord{\left/ {\vphantom {{\text{m}} {\text{s}}}} \right. \kern-\nulldelimiterspace} {\text{s}}}[/tex] for [tex]v[/tex], [tex]8\,{{\text{m}} \mathord{\left/ {\vphantom {{\text{m}} {\text{s}}}} \right. \kern-\nulldelimiterspace} {\text{s}}}[/tex] for [tex]u[/tex] and [tex]44\,{\text{m}}[/tex] for [tex]s[/tex] in the above equation.

[tex]\begin{aligned}a&=\dfrac{{{{\left({14\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{\text{s}}}}\right.\kern-\nulldelimiterspace}{\text{s}}}}\right)}^2}-{{\left({8\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{\text{s}}}}\right.\kern-\nulldelimiterspace}{\text{s}}}}\right)}^2}}}{{2\times44}}\\&=1.5\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{{{\text{s}}^{\text{2}}}}}}\right.\kern-\nulldelimiterspace}{{{\text{s}}^{\text{2}}}}}\\\end{aligned}[/tex]

Thus, the acceleration of the car travelling in a straight line is [tex]\fbox{\begin\\1.5\,{{\text{m}}\mathord{\left/{\vphantom{{\text{m}}{{{\text{s}}^{\text{2}}}}}}\right.\kern-\nulldelimiterspace}{{{\text{s}}^{\text{2}}}}}\end{minispace}}[/tex].

Learn more:

1.  Conservation of momentum https://brainly.com/question/9484203

2.  Motion of a ball under the gravity https://brainly.com/question/10934170

3. The motion of a body under the friction force https://brainly.com/question/4033012

Answer Details:

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords:

Initial speed of 8.0 m/s,Newton's law, motion, distance, final speed of 14.0 m/s, car travelling in a straight line, accelerates uniformly and distance of 44 m.

7 km is equal to:

0.7 m
70 m
700 m
7,000 m

Answers

The answer is 7000 meters.
Salutations!

You need to keep the following in mind:

→ [tex]1km = 1000m[/tex]

so >>> [tex]7*1000=7000m[/tex]

Hope I helped (:

Have a great day!

An object has a mass of 30 grams and measures 3cmx2cmx1cm. What is the density of the object?

Answers

The density of the object is the ratio of its mass and volume. From the given dimensions above, we determine the volume through the equation,

      V = L x W x H

Substituting,

    V = (3 cm)(2 cm)(1 cm) = 6 cm³

From the idea presented above,
    d = m/V

Substituting the known values,

   d = (30 g)/ (6 cm³) = 5 g/cm³

ANSWER: 5 g/cm³

What is the value of work done on an object when a 10–newton force moves it 30 meters and the angle between the force and the displacement is 25°?


Answers

The component of force which is parallel to the path of the motion is 10N * cos25 = 9.06 N 
This component is the only "effective" force, and it is the one doing work. 

Work = force * distance

Work = 9.06 N * 30 m

Work = 2.7×10^2 J

Answer:

2.7×10^2 Joules

Explanation:

A solar powered car converts _______________ energy into _________________ energy. A) light, chemical B) light, mechanical C) mechanical, light Eliminate D) electrical, mechanical

Answers

the answer is B) because solar energy comes from the sun and then you need it to change to mechanical to run your car 

A solar-powered car converts light energy into mechanical energy. Therefore, option (B) is correct.

What is a solar-powered car?

A solar car is a vehicle running on electricity produced by the conversion of sunlight into useful energy. Solar cars are a combination of aerodynamics, laws of motion, and clean converted energy.

Solar panels help in the conversion of solar power into usable electricity that is stored in batteries. These batteries are used as the fuel which we need to run the vehicles.

A solar car only depends on the photovoltaic cells to absorb the sunlight and transform it into usable energy to power the engine. Photovoltaic cells are based on the principle of solar thermal energy by converting solar energy instead of thermal conversion, directly to usable electricity.

Solar cars have solar panels to be mounted on the surfaces absorbing maximum sun rays, which are generally on the rooftop. The photovoltaic cells comprise Silicon, Galium, Indium, and Nitrogen gas.

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When mars is on the opposite side of the sun from earth, it is about 4.0×108km away. how long does it take a radio signal traveling at the speed of light, c=3.00×105km/s, to go from earth to mars at this time? be sure to give your answer with the appropriate precision?

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Final answer:

When Mars and Earth are on opposite sides of the sun, the distance between them is approximately 4.0x108 km. Given that the speed of light is about 3.00x105 km/s, it takes just over 22 minutes (or around 1333.33 seconds) for a radio signal to travel from Earth to Mars.

Explanation:

The speed of light, denoted as c, is approximately 3.00 x 105 km/s. We are given that the distance between Mars and Earth when they are on opposite sides of the Sun is approximately 4.0 x 108 km. Since speed is defined as the distance traveled per unit of time, we can calculate the time it takes for a radio signal to travel from Earth to Mars by dividing the total distance by the speed of light.

Calculating Time

Using the formula Time = Distance/Speed, replacing the symbols with the values given results in: Time = 4.0x108 km / 3.00x105 km/s. Performing the calculation reveals that it takes approximately 1333.33 seconds for a radio signal to travel from Earth to Mars when they are on opposite sides of the sun.

This answer tells us that even at the speed of light, interplanetary communication experiences considerable delays due to the vast distances involved. For instance, if astronauts on Mars were trying to communicate with their counterparts on Earth, there would be a delay of just over 22 minutes each way.

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What do scientist mean when they use the term inertia?

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The term inertia means a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, and less that state is changed by an external force

The word inertia is the resistance of any physical object to any change in it's state of motion.   Things like the objects direction, speed, or it's state of rest are all included. 

Inertia can also be defined as the tendency of objects to keep moving in a straight line at it's constant velocity.


A certain machine changes a large input force into a smaller output force. how will the machine affect the distance over which the force is applied? explain.

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A machine that lowers the input force is a step down machine. If the force is lowered, the distance at which the the force is applied will be lowered as well. Assuming that the work done by the force does not stay constant and is affected by force, the distance will be reduced.

Tracy took a road trip out west where she had a chance to visit both the north and south rims of the Grand Canyon. She observed more wildlife and a greater variety of views from the south rim, but enjoyed a less crowded more peaceful experience at the north rim. She was able to hike several trails at both locations and found the staff to be helpful. What would be the best way for Tracy to categorize her observations? a. Similarities = variety of views, crowds, peaceful Differences = amount of wildlife, hiking trails, staff b. Similarities = helpful staff, ability to hike Differences = variety of views, crowds, peacefulness, wildlife sightings c. Similarities = helpful staff, views, amount of wildlife Differences = difficulty levels of hiking trails, crowds, peacefulness d. Similarities = Both crowded, excellent views, ability to hike Differences = peacefulness, staff availability, amount of wildlife

Answers

similarities to differences 
B is the answer hope I helped 

A passenger with a mass of 140,000 kg flies at a constant velocity of 220 m/s at an altitude of 11,000 meters. What net force acts on the plane?

Answers

Final answer:

According to Newton's first and second laws of motion, since the plane is flying at a constant velocity without acceleration, the net force acting on the plane is zero.

Explanation:

The question refers to a concept in Physics known as Newton's first law of motion, commonly referred to as the 'law of inertia'. According to this law, an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force. The question states that the plane is experiencing constant velocity, indicating there is no acceleration. According to Newton's second law (F = ma), where F is force, m is mass, and a is acceleration, if there is no acceleration (a = 0), there will be no net force acting upon the object. Regardless of the plane's mass or its velocity, due to the absence of acceleration, the net force acting on the plane will be zero.

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Final answer:

The net force acting on a passenger plane with a mass of 140,000 kg flying at a constant velocity of 220 m/s and an altitude of 11,000 meters is zero, due to the forces being balanced as per Newton's first law of motion.

Explanation:

A passenger plane with a mass of 140,000 kg flies at a constant velocity of 220 m/s at an altitude of 11,000 meters. The net force acting on the plane is zero. This is because when an object is moving with a constant velocity, it means that there is no net acceleration.

According to Newton's first law of motion, if an object is moving at a constant velocity, the forces acting on the body must be balanced, resulting in no net force acting on the object. In the context of an airplane flying at a constant velocity and altitude, the thrust produced by the engines must be equal to the sum of all drag forces and the gravitational pull, creating a balanced force scenario where the net force equals zero.

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