Question
In: Physics
This all counts as 1 question in class because it's supposed to be already known. So...
This all counts as 1 question in class because it's supposed to be already known. So please answer all of them. I just want to be sure I'm right.
Question 1
Which of the following statements are true regarding momentum? Check all that apply.
| The total momentum of an isolated system is conserved, but internal forces can change the total momentum of the system |
|
pinitial = (m1v1)i + (m2v2)i + (m3v3)i + … |
|
pfinal = (m1v1)f + (m2v2)f + (m3v3)f + … |
| The x and y components of momentum are independently conserved |
| Total momentum is conserved, but angular momentum is not. |
| A figure skater spins faster when she draws in her arms because torque is conserved. |
| Momentum points in the same direction as the applied force |
| Angular momentum points in the same direction as the net applied torque |
| Momentum points in the same direction as the velocity of the object |
Question 2
A bug and the windshield of a moving car collide. Indicate which of the following statements are TRUE. (Select all that apply)
| The impulse on the bug and the car are the same magnitude |
| The impact force on the bug and the car are the same magnitude |
| The change in velocity of the bug and the car are the same |
| The change in momentum of the bug and the car are the same magnitude |
| None of the above |
Question 3
A running thief is being chased by the police, and he jumps on a stationary skateboard hoping he will be able to go faster. That is a good idea because:
| Momentum is conserved, and thus his velocity will increase when he jumps on the skateboard (which has a smaller mass). |
| Angular momentum is conserved, so that the wheels on the skateboard can spin much faster than his feet can run on the ground. |
| Momentum is conserved, and since his mass combined with the skateboard is larger, he can go faster. |
| Momentum is conserved, which means he will go a little slower on the skate, but will look cooler as he does so. |
Question 4
Which of these are forms of energy? Check all that apply:
| Kinetic Energy |
| Gravitational Potential Energy |
| Spring Potential Energy |
| Friction Energy |
| Thermal Energy |
| Inertial Energy |
| None of the above |
Question 5
Bob pushes a 1-meter wide bookcase with a force of 100 N for 10 seconds, but the bookcase does not move due to friction. How much work has Bob done?
| 100 Nm |
| 1000 Nm |
| 10 Nm |
| None of the above |
Question 6
Which of the following are units of Work?
|
kg / s2 |
| N m |
| Joules |
| Calories |
| Degrees |
|
(kg m / s)2 / kg |
| None of the above |
Question 7
If an object has kinetic energy, then it also must have... (check all that apply)
| Speed |
| Impulse |
| Acceleration |
| Force |
| None of the above |
Question 8
When an object is lifted 10 meters, it gains a certain amount of potential energy. If the same object is lifted 20 meters, its potential energy is:
| Less |
| The same |
| Twice as much |
| Four times as much |
| None of the above |
Question 9
Which of the following statements are true? Check all that apply:
| Work is the what you get when a force acts over a certain distance. Therefore, without distance or force there would be no work. |
| Work and Distance are related because force is acted over a long distance. |
| Without work you do not have force. |
| Energy is the ability to do work or make work, and work is not done without it. |
| Energy causes a change, and work is needed for energy to exist. |
| Energy is the ability to do work or cause a change, and work is the transfer of energy. |
| Kinetic energy is the energy of motion, and potential energy is stored energy. |
| Potential energy is the energy of weight, and kinetic energy is the energy of nuclear atoms. |
| None of the above |
Solutions
genius_generous answered 2 years agoRelated Solutions
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