An idea, event, or object can be represented by a ____ to help people better understand it.

Answer:

A) sunlight to strike at different angles

Explanation:

A tilt in the earth’s axis causes sunlight to strike at different angles.

Answer:

A) sunlight to strike at different angles

Explanation:

Picture the sun's rays hitting Earth.

Here is proof that my answer is correct:

Answer:

average speed = 80/3 miles per hour (exactly)

average speed = 26.7 mph (approximately)

Explanation:

average speed = distance/time

average speed = (80 miles)/(3 hours)

average speed = 80/3 miles per hour (exactly)

average speed = 26.7 mph (approximately)

Explanation:

80/3 mph is the average speed

Oxygen (O) is generally considered the more reactive nonmetal compared to phosphorus (P), due to its higher electronegativity and its strong oxidizing properties.

When comparing the reactivity of phosphorus (P) and oxygen (O), it is important to consider their positions on the periodic table and their chemical properties. Oxygen, which is in the chalcogen group (Group 16), is a highly reactive nonmetal and a strong oxidizing agent that forms compounds with most elements. Being more electronegative, oxygen has a greater tendency to attract electrons, which makes it more reactive than phosphorus in many situations.

Phosphorus is also a very reactive nonmetal, particularly in its white phosphorus form, which can spontaneously inflame in air. However, in reactions with other nonmetals or in the formation of oxides, oxygen's higher electronegativity usually makes it the more reactive element. Therefore, oxygen is considered to be the more reactive nonmetal when compared to phosphorus.

Answer:

the velocity is 10 m/s

Explanation:

Using the expression for kinetic energy we have:

[tex]Ek=\frac{1}{2} *m*v^{2} \\\\Ek=100J\\m=2kg\\v=\sqrt{(2*100/2)}\\ v=10[m/s][/tex]

Answer:

10 m

Explanation:

Answer:

8,790.9

Explanation:

first we start with parentheses so we take (102,900/12) and (170x1.27) and simplify these 102,900/12 would equal 8575, and 170.1.27 would equal 215.9. next we add these together, so (8575)+(215.9), and that would equal our answer which is 8,790.9

To calculate (102,900/12)+(170x1.27) correctly to significant figures, we find that the sum is 119.9 when rounded to the tenths place. It's essential to respect the rules for significant figures, where the precision of the least precise measurement used in the calculation dictates the precision of the final answer.

The solution to the problem (102,900/12)+(170x1.27) needs to be expressed to the correct number of significant figures. When performing calculations with measured values, it's important to consider the precision of the numbers involved. In addition, different operations have different rules for significant figures.

After calculating each component, we then add the two results. The sum must be reported to the lowest place value of the least precise measurement (in this case, the tenths place). This means that the correct final answer, expressed with the appropriate number of significant figures, is 119.9 (assuming the first calculation to be an exact number).

When dealing with the addition of 89.332 and 1.1, since the second number has fewer significant figures after the decimal place, the result should be reported to match that precision. The answer, when rounded to the correct number of significant figures, is 90.4.

Overall, understanding the rules for significant figures is crucial in accurately reporting measurements and results in scientific and mathematical contexts.

From mechanical energy.

Answer:mechanical energy.

Answer:

Pendulum:

A pendulum consists of a mass (known as a bob) attached by a string to a pivot point. As the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

Energy Transformations:

From Max to Mean Position:

When the bob of the pendulum is held high at one maximum. All the energy of the pendulum is in the form of Potential Energy. The speed of the bob is zero. When released, the bob starts moving downward and as it moves, it gains speed. Here, the Potential Energy of the system is being converted into Kinetic Energy. At the mean position, when the bob is at the minimum height, the potential energy of the system is zero and Kinetic Energy is maximum as the bob is at its maximum speed.

From Mean to Max Position:

Due to Inertia, the bob at the speed v continues its motion and moves towards the other extreme position. And as it do so, the speed decreases and becomes zero at the extreme position. The Kinetic energy converts into Potential Energy,

The motion thus continues.

A graph has been attached for better understanding of the Energy Transformations.

Answer:

Sooo . . . whats the answer

Explanation:

Answer:

Explanation:

V= 20m/s

M= 24,500kg.m/s

M = m x v

m = M/v

m = 24,500/20

m = 1,225kg

Answer:

L=2.003696

Explanation:

The question is on expansion due to heat

The general formulae is;

L= L₀ { 1+∝(T₂-T₁)}

where L₀ is initial length of bar at 20°, L is length of bar at asked temperatures, ∝ = 23.1× 10^-6 °c , T₂ is the final temperature, T₁ is the initial temperature in °c

Given;

L₀=2m

T₂=100°c

T₁=20°c

∝ = 23.1× 10^-6 °c

Substitute values in the equation

L= L₀ { 1+∝(T₂-T₁)}

L=2{1+23.1× 10^-6(100-20)}

L=2{1.001848}

L=2.003696

Final answer:

The length of the aluminum bar at a temperature of 100 degrees Celsius would be approximately 2.0009 meters.

Explanation:

The length of a metal bar can change with temperature due to thermal expansion. The relationship between the change in length and the change in temperature is described by the thermal expansion coefficient of the metal. In this case, we are given an aluminum bar that is 2 m long at a temperature of 20 degrees Celsius. To find the length of the bar at a temperature of 100 degrees Celsius, we can use the formula:

Lfinal = Linitial * (1 + α * ΔT)

Where Lfinal is the final length, Linitial is the initial length, α is the thermal expansion coefficient, and ΔT is the change in temperature. The thermal expansion coefficient for aluminum is approximately 0.0000225 per degree Celsius. Plugging in the given values:

Lfinal = 2 * (1 + 0.0000225 * (100 - 20))

Lfinal ≈ 2.0009 mSPJ11

Answer:

Question 1 is true, question 2 is b

Answer:

I believe the answer is D- "all matter is made up of atomic particles which are in constant random motion."

Explanation:

Hopes this helps:)

Answer:

all matter is made up of atomic particles which are in constant random motion

Explanation:

Answer:

Momentum of the skier is 350 Kg.m/sec

Explanation:

Momentum of a body can be calculated using the following rule:

P = m * v

where:

P is the momentum of the body

m is the mass of the body given as 70 Kg

v is the velocity of the body given as 5 m/sec

Substitute with the givens in the above rule to get the momentum of the skier as follows:

P = m * v

P = 70 * 5

P = 350 Kg.m/sec

Hope this helps :)

Answer:

the answer is C.

Explanation:

radiation goes from hot to cold.

Based on the diagram that was drawn by Allison to illustrate radiation, the labels that should replace the X and Y is hot and cold.

Radiation simply means the emission or the transmission of energy in the form of particles or waves through space.

From the complete question, it should also be known that radiation is the energy that comes from a source and then travels through space at the speed of light. From the diagram that was drawn by Allison to illustrate radiation, the labels that should replace the X and Y is hot and cold.

Read related link on:

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Answer:

The act of using senses or tools to gather information is called Observation.

Answer: It is called an observation

Explanation: When we have a phenomenal and we want to gather information about it, we need to "observe" it.

This may be done by using our senses, like looking, smelling, touching, or a more modern approach, using tools, like spectrometers, velocimeter, or the needed tool.

A given feature of a phenomenon that can be measured is called an "observable", and the act of measuring this "observable" is called an "observation"

Answer:

light is refracted towards the normal.

Explanation:

The more dense medium have a higher refractive index and so the light slows down towards the normal.

The answer is the index of refraction of the second medium is lower.

Answer:

Both objects are packed equally tightly.

Explanation:

For Substance R we have

mass = 10 g

Volume = 22 cubic cm

So we know that density is defined as

[tex]\rho = \frac{m}{V}[/tex]

here we have

[tex]\rho = \frac{10 g}{22 cm^3}[/tex]

[tex]\rho = 0.454 g/cm^3[/tex]

For substance S we have

mass = 25 g

Volume = 55 cubic cm

So we know that density is defined as

[tex]\rho = \frac{m}{V}[/tex]

here we have

[tex]\rho = \frac{25 g}{55 cm^3}[/tex]

[tex]\rho = 0.454 g/cm^3[/tex]

So here both have same density

so  correct answer would be

Both objects are packed equally tightly.

Answer:

c

Explanation:

Answer:

C. 720 N up

Explanation:

Newton's third law states that:

"When an object A exerts a force on an object B, then object B exerts an equal and opposite force on object A"

In this situation, we can imagine the man to be object A and the bench as object B. The force exerted by the man on the bench is:

720 N, down

So according to Newton's third law, the bench must exert an equal and opposite force on the man. Therefore, the force exerted by the bench must be

720 N, up

Answer:

1: work

2: energy

3: joule

1) The ability to cause change in matter

Energy

2) The product of force and the distance through which it moves

Work

3) metric unit of work and energy equals to one newton times one matter

joule

Answer: 0.147

Explanation:

just took it

Answer:

0.147

Explanation:

Because i just did it and got it right :))) your welcome

Answer:second

Explanation:

Answer:

The SI unit that is used to measure time is the 'second'.

Explanation:

The International System of Units has defined seven units of measure which are considered as a basic set from which all other SI units can be derived.

Hence, the base unit defined to measure the time is second. It is defined by the oscillations of the radiation which correspond to the transition between two levels of the caesium atom.

Answer:

The force between the planet and the satellite is 4.76 * 10³ Newtons

Explanation:

Given:

Mass of satellite = m = 500 kg

Distance of the satellite from Earth's surface = h = 35000 m

We know that:

Mass of Earth = M = 5.9 * 10²⁴ kg

Radius of Earth = R = 6.4 * 10⁶ m

Gravitational Constant = G = 6.673 x 10⁻¹¹ N m²/kg²

Force between Earth and an object is given as:

F = GmM/(R+h)²

= (6.673 x 10⁻¹¹ x 500 x 5.9 x 10²⁴)/((6.4 * 10⁶)+(3.5*10⁴))²

= (1.97*10¹⁷)/(6.435*10⁶)²

= (1.97*10¹⁷)/(4.14*10¹³)

= 4.76 * 10³ N

Answer: F = 4.76 * 10³ N

Explanation:

We know that the force of gravity between two objects is:

F = G*m*M/r²

Where M is the mass of earth, m is the mass of the satelite, r is the distance between the radius of the earth and the satelite and G is the gravitational constant, and the data that we have is:

Mass of satellite: m = 500 kg

Distance of the satellite from Earth's surface: H = 0.035x10^6 m

Radius of Earth: R = 6.4 x 10⁶ m

So we have that r = R + H = 6.435x10^6

Mass of Earth: M = 5.9 * 10²⁴ kg

Gravitational Constant: G = 6.673 x 10⁻¹¹ N m²/kg²

Then the force that the Earth does in the satellite is:

F = (1.97*10¹⁷)/(6.435*10⁶)²

F = (1.97*10¹⁷)/(4.14*10¹³)

F = 4.76 * 10³ N

Answer:

The shape is a trigonal pyramidal shape.

Hope this helps you.

Answer:

GREEN

Explanation:

Red, Blue, And Yellow are the only Primary colors.

No 2 colors can be combined to make Red, Blue, or Yellow, BUT BLUE AND YELLOW CAN BE COMBINED TO MAKE GREEN.

Therefor, Green is NOT a primary color of light!

Yellow is not a primary color of light.

Hence, the correct option is D.

In the additive color model, which is used in displays like computer screens and TVs, the primary colors of light are red, green, and blue. When combined at full intensity, these colors produce white light.

On the other hand, in the subtractive color model, which is used in mixing pigments like paint or ink, the primary colors are magenta, yellow, and cyan. When mixed in equal amounts, these colors produce black.

While blue, red, and green are primary colors of light, yellow is a primary color in the subtractive color model, but not in the additive color model of light.

Therefore, Yellow is not a primary color of light.

Hence, the correct option is D.

To know more about primary color here

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Answer:

=9696.5J

Explanation:

The latent heat of fusion of a unit mass of copper is the heat released when it changes from its molten state to solid state of the heat absorbed to melt it.

The total energy released is calculated using MLf where M is the mass of the copper and Lf is the latent heat of fusion.

=mLf

=47.30 grams×205.0J/g

=9696.5J

Answer:

-9697

Explanation:

thats the answer

Answer:

It eliminates the reaction force of the object.

Explanation:

It eliminates the reaction force of the object by dissipating the energy on the compression of the padding material and distributing the force of impact over the large surface area. As less area would generate more stress by the force.

We know by the equation:

[tex]\sigma=\frac{F}{A}[/tex]

where F & A are force and area respectively.

Also the compression of material absorbs energy in the form of elastic potential energy given by the equation:

[tex]KE=\frac{1}{2} k.\Delta x^2[/tex]

where:

k= elastic constant

[tex]\Delta x[/tex]= change in the dimension of the elastic materiel

Answer:

it´s C

Explanation:

Answer:

pretty sure its motor 2, with body 1

Explanation:

To build a car with the greatest acceleration, choose motor 2 and body 1.

To find the car with the greatest acceleration, Devon should consider both the motor force and the body mass.

The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

In this case, if Devon wants the greatest acceleration, he should choose motor 2 with body 1. Motor 2 provides the most force, and body 1 has the smallest mass.

This combination will result in the greatest net force and therefore the greatest acceleration.

Learn more about acceleration here:

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Answer:

9.2 N, with significant figure rounding (2 s.f.)

Explanation:

This problem can be solved using momentum. The following equation relates momentum (mass & velocity) with force and time:

Note that  where v is the final velocity and v₀ is the initial velocity. Δv just means change in velocity.

Mass of the egg is 150 g, but we need to convert to kilograms if we want to use Newtons as a unit. 150 g is equal to 0.15 kg. since 1000 g = 1kg. 

m = 0.15 kg

The dropped from 3.0 meters is irrelevant as the question tells us the initial velocity of the egg: 4.4 m/s before it hits the ground.

v₀ = 4.4 m/s [down]

When it comes to a stop, the egg will have a velocity of 0.

v = 0 m/s

The time it takes for the egg to stop is 0.072 seconds.

Δt = 0.072 s

Therefore, if down is positive, then

We round to two significant figures since every quantity has two sig. figs.

We only care about the magnitude, not direction. The answer is 9.2 N.

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5.0

The magnitude of force that the ground exerted on the egg is 9.2N

The change in momentum is equal to the product of impact force applied while colliding and time for that impact.

F. t = m (Vf -Vi)

where, Vf is the final velocity and Vi is the initial velocity.

Given, mass of the egg is 150 g, m = 0.15 kg

The egg is dropped from 3.0 meters and the initial velocity v₀ = 4.4 m/s [down]

When egg strikes the ground, the egg will move with v = 0 m/s

The time taken for the egg to stop is Δt = 0.072 s

Substitute the values into the expression, we get

F x 0.072 = 0.15 x (0 - 4.4)

F = 9.16N

Thus the magnitude of force is 9.2 N.

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Use Pascal's Law.

F1/A1 = F2/A2

F1 = 4400N

A1 = 0.020m^2

F2 = X

A2 = 0.040m^2

4400/0.020 = X/0.040

Cross multiply:

(4400 * 0.040) = 0.020X

176 = 0.020x

Divide both sides by 0.020

X = 176 / 0.020

X = 8800

The force is 8800 N

use pascal's law..to solve the question