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 has a greater volume than the other object.
One object has a greater speed than the other object.
One object is blue and one object is red.
One object has a greater density then the other object.
The correct answer would be: One object has a greater speed than the other object. Kinetic energy depends on both mass and speed, so if two objects have equal masses but different speeds, they will have different kinetic energies.
The correct answer would be: The truck has more kinetic energy because it has a greater mass. Kinetic energy is directly proportional to mass, so the larger truck, with a greater mass, will have more kinetic energy compared to the smaller car. The speed or the motion of going up and down hills and over bumpy roads does not affect the comparison of kinetic energy.
The correct response is: His kinetic energy increased while his speed increases, then it became constant.
Kinetic energy is directly proportional to the square of an object's velocity. As the skydiver accelerates, his speed increases, leading to an increase in kinetic energy. Once he reaches a constant speed of 50 m/s, his kinetic energy remains constant since the square of 50 m/s is the same as the square of 50 m/s.
You're welcome! I'm glad I could assist you. If you have any more questions, feel free to ask.
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 truck has more kinetic energy because it has a greater mass.
The car and truck have the same kinetic energy.
The truck has less kinetic energy because it has greater mass.
The car has more kinetic energy because it moves fast down hills.
Which object has the greatest kinetic energy?(1 point)
Responses
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 green car with a mass of 500kg moving at 21 m/s
a red car mass of 500 kg moving at 3 m/s
To determine which object has the greatest kinetic energy, we need to calculate the kinetic energy of each object using the formula KE = 1/2 * mass * velocity^2.
Calculating the kinetic energies for each object:
- Blue car: KE = 0.5 * 500 kg * (30 m/s)^2 = 225,000 J
- Yellow car: KE = 0.5 * 500 kg * (12 m/s)^2 = 36,000 J
- Green car: KE = 0.5 * 500 kg * (21 m/s)^2 = 110,250 J
- Red car: KE = 0.5 * 500 kg * (3 m/s)^2 = 2250 J
The object with the greatest kinetic energy is the blue car with a mass of 500 kg moving at 30 m/s, which has a kinetic energy of 225,000 J.
Use the image to answer the question.
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 rabbit because it has less mass.
Neither one because they are moving at the same speed.
The wildlife keeper because they have a greater mass.
The wildlife keeper because they speed up and catch the rabbit.
Unfortunately, since there is no image provided, I am unable to use it to answer the question accurately. However, I can provide a general response.
To determine which has the greater kinetic energy, we need to consider the mass and speed of both the rabbit and the wildlife keeper. If the rabbit has a higher speed than the wildlife keeper, it may have more kinetic energy even though it has less mass. On the other hand, if the wildlife keeper has a higher speed or a significantly greater mass than the rabbit, it is possible for them to have greater kinetic energy. Additionally, the circumstances of the chase and any changes in speed would also affect the comparison.
Without specific information about the mass and speed of both the rabbit and the wildlife keeper, it is not possible to determine who has the greater kinetic energy.
the rabbit is 5 m/s and 4 kg
The wildlife keeper is 5 m/s and 60 kg
To determine who has the greater kinetic energy, we can calculate the kinetic energy for both the rabbit and the wildlife keeper using the formula KE = 1/2 * mass * velocity^2.
For the rabbit:
Mass (m1) = 4 kg
Velocity (v1) = 5 m/s
KE1 = 1/2 * 4 kg * (5 m/s)^2 = 50 J
For the wildlife keeper:
Mass (m2) = 60 kg
Velocity (v2) = 5 m/s
KE2 = 1/2 * 60 kg * (5 m/s)^2 = 750 J
Therefore, the wildlife keeper has the greater Kinetic energy.
the rabbit is 5 m/s and 4 kg
The wildlife keeper is 5 m/s and 60 kg
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 rabbit because it has less mass.
Neither one because they are moving at the same speed.
The wildlife keeper because they have a greater mass.
The wildlife keeper because they speed up and catch the rabbit.
Apologies for the incorrect response in my previous message. Thank you for providing the correct information.
Given that both the rabbit and the wildlife keeper are moving at the same speed (5 m/s), we can now compare their kinetic energies based on their masses.
For the rabbit:
Mass (m1) = 4 kg
Velocity (v1) = 5 m/s
KE1 = 1/2 * 4 kg * (5 m/s)^2 = 50 J
For the wildlife keeper:
Mass (m2) = 60 kg
Velocity (v2) = 5 m/s
KE2 = 1/2 * 60 kg * (5 m/s)^2 = 750 J
Therefore, the wildlife keeper has the greater kinetic energy. The correct response is: The wildlife keeper because they have a greater mass.
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 increased while his speed increases, then it became constant.
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.
thank you so much
The masses, volumes, and speeds of several objects are shown. Which object has the greatest kinetic energy?(1 point)
Responses
mass = 5 kg, volume = 2,000 cm3, speed = 10 m/s
mass = 5 kg, volume = 2,000 cm 3 , speed = 10 m/s
mass = 2 kg, volume = 10,000 cm3, speed = 5 m/s
mass = 2 kg, volume = 10,000 cm 3 , speed = 5 m/s
mass = 5 kg, volume = 5,000 cm3, speed = 5 m/s
mass = 5 kg, volume = 5,000 cm 3 , speed = 5 m/s
mass = 2 kg, volume = 5,000 cm3, speed = 10 m/s