Underline ALL correct answers 1- A bullet is fired at a tree and become embedded

Question

Underline ALL correct answers

1- A bullet is fired at a tree and become embedded. The collision is elastic or inelastic?

2- What is always conserved during collision, linear momentum or kinetic energy?

3- A car is accelerated from rest by constant force. The velocity of the car is measured at 4 and s seconds after beginning of the acceleration. What is the ratio of velocity at t=4 s to velocity t=2 s

4- Linear momentum of the car is linear function of velocity?

5- Kinetic energy of the car is linear function of velocity?

6- While firing a gun (when bullet accelerates in the gun’s barrel) the shooter feels a push to their shoulder from the gum (the so called recoil). Assuming we know the maximum velocity of a bullet, what law of conservation should we use for estimation of the recoil strength? Linear momentum or energy?

7- A rubber ball is dropped on the concrete floor so it bounced once. The temperature of the ball is measured. Then the experiment is repeated with play-doh (soft plastic) ball which after a fall from the same height got stuck. Temperature of this ball is measured. which ball has a higher temperature. Rubber, play-doh, or both temperatures should be the same

8- Linear momentum before and after collision is always: the same, zero, positive, or 50%

9- I pull a sled for 100m, applying tension to the rope. What minimal additional information is needed to calculate my power during the process. Force, distance, angle, the length of the rope, the mass of the sled, the sled velocity?

Explanation / Answer

1)   The collision is inelastic .

2)    linear momentum .

3)   ratio of velocity = 2 .

4)   Yes, Linear momentum of the car is linear function of velocity .

5) No , Kinetic energy of the car is not linear function of velocity .

6)   Linear momentum .

7)   both temperatures should be the same .

8)   Linear momentum before and after collision is always: the same .

9)   Force, the sled velocity .

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