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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)
Responses
One object is blue and one object is red.
One object is blue and one object is red.
One object has a greater density then the other object.
One object has a greater density then the other object.
One object has a greater volume than the other object.
One object has a greater volume than the other object.
One object has a greater speed than the other object.
The correct answer would be:
One object has a greater speed than the other object.
Kinetic energy is directly proportional to the mass and the square of the velocity of an object. So, if two objects have equal masses but different kinetic energies, it implies that the object with greater kinetic energy must have a greater velocity or speed.
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?(1 point)
Responses
The car and truck have the same kinetic energy.
The car and truck have the same kinetic energy.
The car has more kinetic energy because it moves fast down hills.
The car has more kinetic energy because it moves fast down hills.
The truck has more kinetic energy because it has a greater mass.
The truck has more kinetic energy because it has a greater mass.
The truck has less kinetic energy because it has greater mass.
The correct answer is:
The truck has more kinetic energy because it has a greater mass.
The kinetic energy of an object is directly proportional to its mass. Since the truck has a greater mass compared to the car, it will have more kinetic energy, assuming both are moving at the same speed.
Which object has the greatest kinetic energy?(1 point)
Responses
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 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 yellow car with a mass of 500 kg moving at 12 m/s
a yellow car with a mass of 500 kg moving at 12 m/s
The correct answer is:
A blue car with a mass of 500 kg moving at 30 m/s
The kinetic energy of an object is given by the equation KE = (1/2)mv^2, where m represents the mass of the object and v represents its velocity/speed. Comparing the options provided, the blue car with a mass of 500 kg moving at 30 m/s will have the greatest kinetic energy.
A wildlife keeper is trying to catch an escaping rabbit. Who has the greater kinetic energy, the rabbit or the wildlife keeper?
(1 point)
Responses
The wildlife keeper because they speed up and catch the rabbit.
The wildlife keeper because they speed up and catch the rabbit.
Neither one because they are moving at the same speed.
Neither one because they are moving at the same speed.
The wildlife keeper because they have a greater mass.
The wildlife keeper because they have a greater mass.
The rabbit because it has less mass.
The correct answer is:
The wildlife keeper because they speed up and catch the rabbit.
In this scenario, since the wildlife keeper is actively chasing and catching the rabbit, they accelerate and increase their speed. As a result, the wildlife keeper has a greater kinetic energy compared to the rabbit, which is trying to escape.