Final answer:
A truck with greater mass has more inertia and needs more force to achieve the same acceleration as a lighter truck. A heavier truck does not have less inertia, nor can it be 100 percent efficient in terms of energy use.
Explanation:
Based on Newton's laws of motion, particularly the second law which states that force equals mass times acceleration (F = ma), it is clear that an object with more mass will have more inertia. Inertia is the resistance of any physical object to any change in its velocity. A truck with more mass than another will inherently have more inertia, not less, because inertia is directly proportional to mass.
Because of this direct proportionality, a truck with more mass will also need more force to move or accelerate at the same rate as a lighter truck. This is also why heavier objects accelerate slower than lighter ones when the same force is applied. Regarding efficiency, no machine or vehicle, including trucks, can be 100 percent efficient due to the second law of thermodynamics, which says that some energy is always lost in the form of heat or other non-usable forms during energy transfers.
Why are fossil fuel resources sometimes referred to as "buried sunshine"?
Answer:
Fossil fuel resources sometimes referred to as "buried sunshine"? Because they make the Earth warm because they are found deep in the Earth and the energy stored in them was obtained from the sun long ago because they produce energy the same way the sun does all of the above.
Explanation:
Answer:
Explained
Explanation:
All plants or producers which there food by sunlight with help of a process called photosynthesis. These plants are eaten by consumers that is animals and plant eaters are eaten by animal eaters. In this process the energy is transmitted. Although the primary source of energy is sun. These plants and animals when dead are buried under the earth to form fossil fuels. This why fossils are sometimes referred as " buried sunshine"
Which of the following could be classified as matter? Check all of the boxes that apply.
Answer: desk, water, helium and clouds
Explanation:
Answer:
Desk
Water
Cloud
Helium
Explanation:
Edge 2023
49. The potential energy of a spring is 0.3 J when it is compressed 0.04 m to the left of its equilibrium position. At this
point it comes to its leftmost position. What is its kinetic energy at this point?
A. -0.3 J
B. zero
C. 0.3 J
D. 375 N/m
Answer:
B. zero
Explanation:
The total mechanical energy of a spring is equal to the sum of its kinetic energy, K, and its potential energy, U:
[tex]E=K+U[/tex]
Where
[tex]K=\frac{1}{2}mv^2[/tex] is the kinetic energy, where m is the mass and v is the speed
[tex]U=\frac{1}{2}kx^2[/tex] is the potential energy, with k being the spring constant and x the displacement
The total mechanical energy is conserved during the entire motion of the spring. We have two particular situations:
- At the equilibrium position, the displacement is zero: x=0, so U=0 and the kinetic energy is maximum.
- At the position of maximum displacement (so the leftmost or rightmost position), the displacement is maximum, so U is maximum while the speed is zero (v=0), and therefore the kinetic energy is also zero: K = 0.
Therefore, the correct answer is
B. zero
The energy transfer diagram represents the energy of a light bulb.
How much electrical energy is involved in this transformation?
60 J
80 J
100 J
120 J
Answer:
D) 120 J
Explanation:
EDG 2019-2020
The electrical energy is involved in this transformation will be 120 J. Option D is correct.
What is the law of conservation of energy?According to the law of conservation of energy, the energy of an isolated system stays unchanged throughout time; it is said to be conserved.
Energy can not be created nor be destroyed and can be transferred from one form to the other form.
We have an initial amount of electrical energy. Which is turned into two types of energy, electric and the light energy.
Electrical energy, (E)=?
Light energy (L)=100 J
Heat energy (H) =20 J
The equation is found as;
[tex]\rm E= L + H \\\\ E=100+20 \\\\ E=120 \ J[/tex]
Hence, the electrical energy is involved in this transformation will be 120 J.
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The phenomenon that describes the emission of electrons from a metal surface when light shines on it is the
Answer:
The phenomenon that describes the emission of electrons from a metal surface when light shines on it is the Photoelectric effect.
The phenomenon that describes the emission of electrons from a metal surface when light shines on it is the Photoelectric effect.
Explanation:
The term photo is used to define light and so photoelectric effect defines the phenomena when the light falls on the metal and the resultant effect of electrons on the surface of the conductor. Photoelectric effect also known as photoemission.
When the light is made to be incident on the surface of a conductor, electrons are discharged or released from the metal. Here the energy of the light acts as a work function so that it is used for the energy that is required to emit electrons.
You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the ship. It takes him 4 minutes (240 s) to row the treasure with a constant force of 500 N. What power does the pirate supply? A) 75 W B) 100 W C) 125 W D) 250 W
Answer:
C
Explanation:
Power is work divided by time:
P = W / t
Work is force times distance:
W = F d
Therefore:
P = F d / t
Given that F = 500 N, d = 60 m, and t = 240 s:
P = 500 N * 60 m / 240 s
P = 125 W
Answer is C.
You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the ship. It takes him 4 minutes (240 s) to row the treasure with a constant force of 500 N. The pirate supply 125 W of power.
What is force?
A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Power is work divided by time:
P = W / t
Work is force times distance:
W = F d
Therefore:
P = F d / t
Given that F = 500 N, d = 60 m, and t = 240 s:
P = 500 N * 60 m / 240 s
P = 125 W
You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the ship. It takes him 4 minutes (240 s) to row the treasure with a constant force of 500 N. The pirate supply 125 W of power.
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Classify the items based on whether they are or are not matter.
toothpaste
happiness
gasoline
sound
bacteria
cell
Matter: Toothpaste, Gasoline, Bacteria, Cell
Non-matter: Happiness, Sound.
Explanation:
The substances which occupies mass or volume occupying space is known as matter. It comprises of those things that can be seen through the eyes and it may include things like water, plants, food, dresses, etc. It can be defined by color or hardness.
The substances that are made of energy without occupying space is known as non-matter substances. It can be classified as form of some energy. Some examples include light energy from torch, heat energy from fire and sound energy form whistle, etc.
what are the effect of propagation of light
The propagation of light describes how light spreads out from a source and diminishes in intensity with distance, following the inverse square law. This concept is vital in fields like sample analysis and lithography. Understanding light propagation is essential for theoretical and practical physics and technology applications.
The propagation of light is an essential concept in physics with significant implications. When light travels from a source, such as a lightbulb, it expands in all directions, covering an ever-widening area. Because the total amount of light doesn't change, the amount of light in any given place decreases as the distance from the source increases, illustrating the inverse square law.
This weakening of light intensity has various practical applications:
Sample Analysis: In scientific research, when a sample is illuminated, and its scattered light is measured, the detected light is affected by both the sample and the propagation effects. Lithography: When printing patterns onto substrates using a mask, the light reaching the photoresist is altered by propagation. Therefore, masks must be designed to account for this to ensure the correct pattern is transferred.Additionally, the wave-like nature of light is crucial in understanding interference and diffraction, as evidenced by the double-slit experiment. This experiment demonstrated that light behaves as a wave, creating observable interference patterns.
Overall, understanding how light propagates is vital for theoretical science and practical applications in technology and industry.
In the seventeenth century, astronomer Johannes Kepler observed the planets revolving around our sun and analyzed data about them. He found that as the distance from the Sun increases, the amount of time it takes for the planet to go all the way around the Sun increases. Even though Kepler did not know why his observation was true, it has been found that planets in all solar systems always revolve around suns the same way.
Which best describes why Kepler’s observation of planetary motion is a law instead of a theory?
It does not discuss independent and dependent variables that can be observed or tested.
It does not provide an explanation for why the relationship exists between distance and orbit time.
A lot of new technology has been developed that can record more accurate data about planetary motion.
A lot of different understandings of why planets move have been developed, and Kepler’s provides the best explanation.
Answer:
"A lot of different understanding of why planets move have been developed, and Kepler's provides the best explanation."
Explanation:
All of the other three choices actually contradict the initial question which is asking why Kepler’s observation of planetary motion is a law instead of a theory. A law is a well established theory which means that it is an emergent truth that is known to be true. Kepler's laws have been verified and proven numerous times:) For a deductive proof of Kepler's laws look to Sir Isaac Newton.
The statement that best describes why Kepler’s observation of planetary motion is a law instead of a theory is, It does not provide an explanation for why the relationship exists between distance and orbit time.
What is Kepler's law of planetary motion?The law says that planets revolve in elliptical orbits around the Sun as a focus. Also, it covers the same area of space in the same amount of time while orbiting. The third law is orbital period of a planet is proportional to its semi-major axis.
The law gives the relation between time and distance according to second and third law. But, if we go about the reason, why is so? Then, it has no answers.
Thus, It does not provide an explanation for why the relationship exists between distance and orbit time.
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A pendulum has 232 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom of its swing?
Answer:
232 J
Explanation:
Energy is conserved. All of the potential energy at the highest point of the swing is converted to kinetic energy at the lowest point.
An object that has the ability to do work has __________ energy.
Answer:
Kinetic energy. ( i didnt reallysee if someone answered already but if so, sorry!)
Answer:Kinetic energy
Explanation:
two tenses R1 and R2 are connected in parallel across a supply. what is the ratio of heat produced in resistances R1 and R2.
**please tomorrow is my exam,
if you answer I'll mark you brainliest
Answer with explanations:
V=I1*R1=I2*R2 (when R1 and R2 are connected in parallel)
Therefore, rearranging above, I1/I2=R2/R1
Heat produced = I^2R
Ratio of heat produced by R1 and R2
= (I1^2*R1) / (I2^2*R2 )
= (I1/I2)^2 * (R1/R2)
= (R2/R1)^2 * (R1/R2)
= R2/R1
A small 17 kilogram canoe is floating downriver at a speed of 2 m/s. What is the canoe's kinetic energy?
Ke=34J. The canoe's kinetic energy floating downriver at a speed of 2m/s and 17kg mass is 34J.
This is a problem of kinetic energy, which is a form of energy, known as motion energy. The kinetic energy of an object is that which is produced because of its movements that depends on its mass and velocity.
The kinetic energy is represented by the following formula: Ke = ½ mv². The kinetic energy is measured in Joules (J), the mass in kilograms (kg) and the speed in meters over seconds (m/s).
A small 17kg canoe is floating downriver at a speed of 2m/s. Let's calculate canoe's kinetic energy.
Ke= (17kg)[(2m/s)²]/2= 68/2 kg m²/s²=34J
.
All of the elements heavier than oxygen are created by fusion reactions in _____.
All stars at birth begin to fuse hydrogen to form helium through nuclear fusion.
However, when the "fuel" of the star (hydrogen and helium) is exhausted, the star will become a red giant and begin to form other elements heavier than oxygen, and then when the star is in the supernova phase, it will generate the rest of the heavy elements that exist in the periodic table, which are even heavier than iron.
Therefore:
All of the elements heavier than oxygen are created by fusion reactions in red supergiants and supernovas.
4 questions!! please Help!! 40 points!!
Answer: digital signals, near both poles, voltage, and the planets travel around Earth.
Explanation:
36. B. digital signal
Electronic signals that pulse current in a series of ones and zeros are known as Digital Signals. A digital signal refers to an electrical signal that is converted into a pattern of bits.
37. C. near both poles
The Magnet field would be strongest on both sides, the North and the south pole. It is equally strong at the north pole when compared with the south pole.
38. C. Voltage
A transformer is designed to convert alternating current from one voltage to another. It can be designed to "step up" or "step down" voltages
39. A. Earth travels around the sun
Earth travels around the sun, the gravity of the Sun keeps Earth and the other planets in their orbits. Just as the Moon orbits the Earth because of the pull of Earth's gravity, the Earth orbits the Sun because of the pull of the Sun's gravity.
Hope this helps :)
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in a compressing spring in a toy dart gun, 0.8 j of work is done. when the gun is fired, rhe spring gives its potential energu to a dart with a mass of 0.04 kg. what is the darts kinetic enegy when it leaves the gun?
Answer:
0.8 J
Explanation:
According to the law of conservation of energy, all the elastic potential energy stored in the spring is converted into kinetic energy of the dart:
[tex]U=K[/tex]
where we have
[tex]U=\frac{1}{2}kx^2[/tex] is the elastic potential energy of the spring, where k is the spring constant and x is the compression/stretching of the spring
[tex]K=\frac{1}{2}mv^2[/tex] is the kinetic energy of the dart, where m is the mass and v is the speed
The elastic potential energy of the spring is equal to the work done in compressing it, so
U = 0.8 J
and according to the law of conservation of energy, the kinetic energy gained by the dart is exactly equal to the potential energy stored in the spring:
K = U =0.8 J
Exposure to what type of radiant energy is sensed by human skin as warmth?
gamma rays
infrared
X-rays
ultraviolet
Answer:Another name for heat energy is... Infrared waves. These cannot be seen by your eyes but can be felt by your skin. ... Gamma Rays. ... Which type of electromagnetic radiation can result in sunburns and skin cancer? Ultraviolet Radiation ... X Rays. What is the distance between one point of a wave to the same point in the ...
Answer:
INFRARED
Explanation:
I TOOK THE TEST
~ K12 STUDENT
8TH GRADE
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2. A person began running due east and covered 15 kilometers in 2.0 hours. What is the average velocity of the person?
Answer:
7.5 km/h (2.1 m/s) due east
Explanation:
The average velocity of the person is given by:
[tex]v=\frac{d}{t}[/tex]
where
d is the displacement
t is the time taken
In this problem,
d = 15 km is the displacement
t = 2.0 h is the time elapsed
so the average velocity is
[tex]v=\frac{15 km}{2.0 h}=7.5 km/h[/tex]
and the direction is the same as the displacement (east).
We can also convert the velocity into SI units (m/s). We have:
d = 15 km = 15,000 m
t = 2.0 h * 3600 s/h = 7200 s
[tex]v=\frac{15,000 m}{7200 s}=2.1 m/s[/tex]
Answer: the answer is 7200s
Explanation: i just now it
Please brainliest
difference between G and g
Explanation:
G is the universal constant of gravitation, approximately 6.67×10⁻¹¹ m³/kg/s².
g is the acceleration due to gravity. It's defined by the universal law of gravity as:
g = MG / r²
where M is the mass of the planet and r is the distance from the planet's center to the object.
Near the surface of the Earth, g is approximately 9.8 m/s².
How much force does the ground exert a 120 pourd person that is standing still?
Answer:
529.2 N
Explanation:
First of all, we need to convert the mass of the person into kg. We have:
1 pound = 0.45 kg
So
[tex]m=120 p \cdot 0.45 kg/p = 54 kg[/tex]
Now the force exerted by the ground on the man is equal to the weight of the man:
[tex]F=mg[/tex]
where
g = 9.8 m/s^2 is the acceleration due to gravity
Substituting
[tex]W=(54 kg)(9.8 m/s^2)=529.2 N[/tex]
a simple pendulum has a period of 3secs. if the value of g is 9.9m/s^2. calculate the length of the pendulum
Answer:
2.3 m
Explanation:
A simple pendulum has a period of:
T = 2π √(L/g)
If T = 3 seconds and g = 9.9 m/s², then L is:
3 = 2π √(L/9.9)
3/(2π) = √(L/9.9)
(3/(2π))² = L / 9.9
L = 9.9 (3/(2π))²
L ≈ 2.3 m
To calculate the length of the pendulum, use the formula T = 2π√(L/g). Rearrange the formula, plug in the given values for T and g, and solve for L.
Explanation:To calculate the length of the pendulum, we can use the formula for the period of a simple pendulum which is T = 2π√(L/g). In this case, we are given that T = 3 sec and g = 9.9 m/s². Plugging in these values, we can rearrange the formula to solve for L:
T = 2π√(L/g)
3 = 2π√(L/9.9)
Squaring both sides of the equation, we get:
9 = 4π²(L/9.9)
Dividing both sides of the equation by 4π² and multiplying by 9.9, we get:
L = (9.9 * 9) / (4π²)
Calculating this expression, we find that the length of the simple pendulum is approximately 0.250 m.
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Countries establish internal economic zones in order to
have fewer economic restrictions
Explanation:
Answer:
have fewer economic restriction
Explanation:
just took quiz
What is the source of the radioactivity in the sun
Answer:
Fusion of Hydrogen to form Helium
Explanation:
The sun is a big ball of gas and it provides solar energy that drives external processes on the earth surface.
The pressure and temperature within the sun provides energy to fuse abundant hydrogen atoms together to form helium atoms. This nuclear fusion process releases a huge amount of energy.
The fusion of hydrogen atoms to form helium is the source of radioactivity in the sun.
8.
An airplane sprinkles black soot on a snow-covered field. The soot will increase the rate that the snow melts because _____.
Black soot decreases the albedo of snow, leading to increased absorption of solar radiation and faster snow melting due to positive feedbacks in climate dynamics.
Explanation:An airplane sprinkles black soot on a snow-covered field. The soot will increase the rate that the snow melts because the darker-colored soot absorbs more solar radiation than the light-colored snow. Unlike snow, which has a high albedo and reflects most solar radiation, soot has a low albedo and thus absorbs more heat, leading to faster melting of the snow. This process is a part of positive feedbacks in climate dynamics, where an initial change is amplified by the effects it induces, such as increased absorption of solar energy leading to further melting.
On Earth, water exists as
Answer:
a resource
Explanation:
people and animals drink it and it keeps use from being dehydrated.
A solid, a liquid, and a gas.
A nonconservative force does the same work regardless of the path taken. True or false ?
Look at the figure, which shows the motion of three balls. The curved paths followed by balls B and C are examples of _____. projectile motion rolling friction linear motion fluid friction
Answer:the answer is projectile motion
Explanation:
Answer:
projectile motion
Explanation:
If a turtle walks at a constant speed of 0.23 m/s, how long will it take to cover a distance of 65 meters?
Time = (distance) / (speed)
Time = (65 meters) / (0.23 m /s)
Time = (65 / 0.23) sec
Time = 282.6 seconds ( that's 4 minutes 42.6 seconds)
The time it would take a turtle moving with a speed of 0.23 m/s to cover a distance of 65 meters is approximately 282.61 seconds.
Explanation:The subject of this question is physics, specifically the concept of speed, distance, and time. The formula that relates these three quantities is speed = distance/time.
In this case, we are asked to calculate the time it would take for a turtle moving with a constant speed to cover a certain distance. Here, the given speed (0.23 m/s) of the turtle and the distance it needs to cover (65 meters) are known.
By rearranging the formula to solve for time, we get time = distance / speed. Plugging in the values, we get time = 65 meters / 0.23 m/s. Doing the math gives approximately 282.61 seconds. Thus, it would take the turtle around 283 seconds to cover the distance of 65 meters at a speed of 0.23 m/s.
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A friend doesn’t believe there are mountain ranges at the bottom of the ocean. About which of the following does he need more information
Answer:Tectonic Plates
Explanation:The ocean floor is part of the Earth's crust, which is made up of tectonic plates that all collide with eachother and form mountain ranges. Sometimes these ranges and valleys are under the ocean.
what term describes the rate at which electric energy is used
Answer:
Power (P)
Explanation:
In electromagnetism, power is defined as the rate at which electric energy is used:
[tex]P=\frac{E}{t}[/tex]
where
E is the electric energy
t is the time
Power is measured in Watts (W), where 1 W corresponds to 1 Joule per second (1 J/s).
In electric circuits, power can be also rewritten as
[tex]P=VI[/tex]
where
V is the voltage drop on the element we are considering
I is the current flowing through the element
The power dissipated through a resistor is also written as
[tex]P=I^2 R[/tex]
where I is the current through the resistor and R the resistance.