Hw M6 (Impossible to Fail Quiz - Pt1)

1a.) Which is NOT the appropriate MKS units for the following?

• Acceleration [m/s]

• Displacement [meters]

• Energy [Joules]

• Spring constant k [N/m]

1b.) Which of the quantities does NOT have the correct MKS units?

• Momentum [kg ⋅ m/s]

• Velocity [m/s]

• Mass [pounds]

• Force [Newtons]

1c.) True or False: Units for impulse, otherwise known as change in momentum, are Newtons per second (N/s)

• True

• False, units of impulse are N⋅s

2.) Two cars, one 4 times heavier than the other, are driving on the H-1 freeway at the same speed. Compared to the heavier car, the momentum of the lighter car is ________________________________ as much as the heavier car.

• a fourth (1/4)

• half (1/2)

• the same

• twice (2)

• four times (4)

3.) Two baseball players are at the batting cages. Batter A hits the ball with 2 times as much force as Batter B, but Batter B is able to apply her force over a duration 4 times as long. Which batter has the most impulse on the ball?

• Player A

• Player B

• Both give the baseball the same momentum

• Cannot answer because not enough information

4.) What is the momentum of a 20-kg child walking at 2 m/s?

• 2 kg⋅m/s

• 10 kg⋅m/s

• 20 kg⋅m/s

• 40 kg⋅m/s

5.) What is the momentum of a 50-kg Cheetah running at 80 mph?

• 1.6 kg⋅m/s

• 50 kg⋅m/s

• 80 kg⋅m/s

• 1790 kg⋅m/s

• 4000 kg⋅m/s

6.) A 3,000 kg Toyota Tacoma travels east at a speed of 15 m/s. What must the mass of a car moving at 50 m/s be in order to have the same momentum as the Tacoma?

• 60 kg

• 900 kg

• 3,000 kg

• 45,000 kg

7a.) You are driving your 1200 kg Honda Accord down the H-2 freeway with a velocity of 29 m/s (65 mi/hr). There is an accident ahead of you and you're required to stop your car. If you take 5 seconds to stop your car, what is the change in momentum of your car?

• 41 N⋅s

• 240 N⋅s

• 6,000 N⋅s

• 34,800 N⋅s

7b.) You are driving your 1200 kg Honda Accord down the H-2 freeway with a velocity of 29 m/s (65 mi/hr). There is an accident ahead of you and you're required to stop your car. If you take 5 seconds to stop your car, what is the force required to stop the car?

• 8 N

• 48 N

• 1,200 N

• 6960 N