1) An 76-kgkg football player traveling 4.4 m/s is stopped in 1.0 s by a tackler

What average power is required to stop him? Express your answer to two significant figures and include the appropriate units.

2) A golf ball of mass 0.045 kg is hit off the tee at a speed of 38 m/s . The golf club was in contact with the ball for 3.3010³ s .

Find the impulse imparted to the golf ball. Express your answer to two significant figures and include the appropriate units.

Find the average force exerted on the ball by the golf club. Express your answer to two significant figures and include the appropriate units.

3) A 91-kgkg fullback is running at 3.8 m/s to the east and is stopped in 0.85 s by a head-on tackle by a tackler running due west.

Calculate the original momentum of the fullback. Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the momentum is to the east, and negative value if the direction of the momentum is to the west.

Calculate the impulse exerted on the fullback. Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the impulse is to the east, and negative value if the direction of the impulse is to the west.

Calculate the impulse exerted on the tackler. Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the impulse is to the east, and negative value if the direction of the impulse is to the west.

Calculate the average force exerted on the tackler. Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is to the east, and negative value if the direction of the force is to the west.

4) A 7400-kg railroad car travels alone on a level frictionless track with a constant speed of 15.5 m/s . A 3250-kg load, initially at rest, is dropped onto the car.

What will be the car's new speed? Express your answer to three significant figures and include the appropriate units.

5) Calculate the force exerted on a rocket when the propelling gases are being expelled at a rate of 1600 kg/s with a speed of 3.910⁴ m/s .Express your answer to two significant figures and include the appropriate units. Enter positive value if the force is opposite to the velocity of the propelling gases and negative value if the force is in the same direction as the velocity of the propelling gases.

6) A 0.145-kg baseball pitched horizontally at 37.9 m/s strikes a bat and is popped straight up to a height of 52.2 m .

If the contact time is 1.90 ms , calculate the magnitude of the average force on the ball during the contact. Express your answer using two significant figures.

Calculate the direction of the average force on the ball during the contact. Express your answer using two significant figures.

7) A ball of mass 0.494 kg moving east (+x+x direction) with a speed of 3.80 m/s collides head-on with a 0.247 kg ball at rest. Assume that the collision is perfectly elastic.

What is be the speed of the 0.494-kg ball after the collision? Express your answer to three significant figures and include the appropriate units.

What is the speed of the 0.247-kg ball after the collision? Express your answer to three significant figures and include the appropriate units.

8) In a ballistic pendulum experiment, projectile 1 results in a maximum height h of the pendulum equal to 2.3 cm. A second projectile (of the same mass) causes the pendulum to swing twice as high, h_2 = 5.2 cm.

The second projectile was how many times faster than the first? Express your answer numerically.

9) The CM of an empty 1200-kg car is 2.35 m behind the front of the car.

How far from the front of the car will the CM be when two people sit in the front seat 2.60 m from the front of the car, and three people sit in the back seat 3.60 m from the front? Assume that each person has a mass of 65.0 kg .Express your answer to three significant figures and include the appropriate units.

10) A 56-kgkg person riding a bike puts all her weight on each pedal when climbing a hill. The pedals rotate in a circle of radius 17 cm .

What is the maximum torque she exerts?