You are told 3 things...1. That there are two objects with equal masses. 2. Both objects are in motion. 3. One object has a greater kinetic energy than the other. How is this possible?
This situation can be possible if the two objects have different velocities (speed and direction) even though their masses are equal.
Kinetic energy is directly proportional to the mass and the square of the velocity. Therefore, if two objects have equal mass but different velocities, the one with the higher velocity will have a greater kinetic energy.
For example, let's say we have two objects with mass m. If object A is moving with velocity v₁ and object B is moving with velocity v₂, and v₁ > v₂, then the kinetic energy of object A will be greater than the kinetic energy of object B.
In summary, the difference in kinetic energy between the two objects is due to their different velocities, despite having equal masses.
A large truck and a small car are moving at the same speed, traveling up and down hills, and over bumpy roads. Which one has more kinetic energy?
If the large truck and the small car are moving at the same speed, then their kinetic energies will be directly proportional to their masses. Since the truck has a larger mass than the car, it will have more kinetic energy.
Kinetic energy (KE) is given by the equation:
KE = (1/2) * mass * (velocity)^2
Assuming both the truck and the car have the same velocity, the truck's greater mass will result in a higher value for kinetic energy.
Therefore, the large truck will have more kinetic energy compared to the small car.
Which object has the greatest kinetic energy?(1 point) Responses a red car mass of 500 kg moving at 3 m/s a red car mass of 500 kg moving at 3 m/s a blue car with a mass of 500 kg moving at 30 m/s a blue car with a mass of 500 kg moving at 30 m/s a green car with a mass of 500kg moving at 21 m/s a green car with a mass of 500kg moving at 21 m/s a yellow car with a mass of 500 kg moving at 12 m/s
To determine which object has the greatest kinetic energy, we can use the equation:
Kinetic Energy (KE) = (1/2) * mass * (velocity)^2
Calculating the kinetic energy for each scenario, we get:
1. red car with a mass of 500 kg moving at 3 m/s:
KE = (1/2) * 500 kg * (3 m/s)^2 = 2250 J
2. blue car with a mass of 500 kg moving at 30 m/s:
KE = (1/2) * 500 kg * (30 m/s)^2 = 225,000 J
3. green car with a mass of 500 kg moving at 21 m/s:
KE = (1/2) * 500 kg * (21 m/s)^2 = 220,500 J
4. yellow car with a mass of 500 kg moving at 12 m/s:
KE = (1/2) * 500 kg * (12 m/s)^2 = 36,000 J
Based on the calculations, the blue car with a mass of 500 kg moving at 30 m/s has the greatest kinetic energy, with a value of 225,000 J.
You are told 3 things...1. That there are two objects with equal masses. 2. Both objects are in motion. 3. One object has a greater kinetic energy than the other. How is this possible? (1 point)
Choices
© One object has a greater speed than the other object.
• One object has a greater density then the other object.
• One object is blue and one obiect is red.
O One object has a greater volume than the other obiect.
The correct choice is:
• One object has a greater speed than the other object.
As mentioned earlier, kinetic energy is directly proportional to the mass and the square of the velocity. Therefore, if two objects have equal masses but different velocities, the one with the higher velocity will have a greater kinetic energy. So, it is possible for one object to have a greater kinetic energy than the other object if it has a greater speed.
A wildlife keeper is trying to catch an escaping rabbit. Who has the greater kinetic energy, the rabbit or the wildlife keeper?
(In the pic under the humans feet it says 60kg and under the bunny it says 4kg)
• Neither one because they are moving at the same speed.
• The wildlife keeper because they have a greater mass.
O The wildlife keeper because they speed up and catch the rabbit.
O The rabbit because it has less mass
The correct choice is:
• The wildlife keeper because they have a greater mass.
Kinetic energy is directly proportional to both mass and the square of the velocity. While the speed of the rabbit and the wildlife keeper might be the same, the wildlife keeper would have greater kinetic energy due to their greater mass. Since the wildlife keeper has a mass of 60 kg whereas the rabbit has a mass of 4 kg, the wildlife keeper will possess more kinetic energy.
A skydiver jumps out of a plane and begins to accelerate. His speed increases to 20 m/s, then 30 m/s. His acceleration slows until he reaches a constant speed of 50 m/s. Which statement correctly describes his kinetic energy during this time?(1 point)
Responses
His kinetic energy was positive at first, but it decreased to zero when he stopped accelerating.
His kinetic energy was positive at first, but it decreased to zero when he stopped accelerating.
His kinetic energy increased quickly at first, then it increased at a constant rate.
His kinetic energy increased quickly at first, then it increased at a constant rate.
His kinetic energy would remain the same for the whole fall as long as he lost no mass.
His kinetic energy would remain the same for the whole fall as long as he lost no mass.
His kinetic energy increased while his speed increases, then it became constant.