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Question 1: Suppose that a young woman heads outside to roller skate on the sidewalk

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Question 1: Suppose that a young woman heads outside to roller skate on the sidewalk. While skating, she realizes she needs to stop and heads for a smart car that is parked nearby. Putting out her arms, she carefully slows herself down to a stop against the car. Which of the following statements is true?

 

A.) The magnitude of the force the woman exerts on the car is the greater than the force the car exerts on the woman.

B.)The magnitude of the force the woman exerts on the car is the equal to the force the car exerts on the woman.

C.)The magnitude of the force the woman exerts on the car is the less than the force the car exerts on the woman.

D.)The only force in this scenario is the force the woman exerts on the car.

E.) Neither the woman nor the car exert a force on each other.

 

Question 2: Suppose the roller skating woman has a mass of 41.3kg.Her roller blades have a coefficient of kinetic friction μk?=0.0306 with respect to the street. She approaches the car, slowing to a speed of v=6.23m/s when she touches the car. If the average force she exerts to slow herself down has a magnitude of F=68.3N how long does it take for her to come to a stop?

 

A.) 3.77s

B.)20.8s

C.) 3.19s

D.)4.60s

E.) 1.95s

 

Question 3: Suppose the smart car from the previous problem has a mass of 634kg. The frictional force the car feels has a magnitude

fk?=65.3N which opposes its motion. What is the car's velocity v after the woman comes to a stop? Assume that the woman slows down for

t=10s.

 

A.) 1.08m/s

B.)2.11 m/s

C.)0m/s

D.) 0.0473m/s

E.) 1.03m/s