Question. Source. Yahoo ! Answers !

Issacs car collides with a stationary trolley . After the collision, the car and trolley lock together and move as one.mass of Issac’s car = 1700 kg

mass of trolley = 800 kg

Initial velocity of Issac’s car = 30 m s–11- Calculate the final velocity of the car and trolley together.

2- Mike’s car has a long crumple zone. Explain in detail why having this crumple zone would make a difference during impact. what are the ideas of velocity before and after the impact.

mass of trolley = 800 kg

Initial velocity of Issac’s car = 30 m s–11- Calculate the final velocity of the car and trolley together.

2- Mike’s car has a long crumple zone. Explain in detail why having this crumple zone would make a difference during impact. what are the ideas of velocity before and after the impact.

Issac’s car is towed away by a tow truck. The rope attached to the car makes an angle of 50 with the horizontal. The rope pulls the car with a force of 900N. The car moves a distance of 40 m along the horizontal road during a time of 20s.

3- What is the work done by the tow truck on the car.

4- What is the power produced by the tow truck while it is moving the car.

Solution.

1)

Let’s start with collision

It is Perfectly inelastic collision .

M1*V1=(M1+M2)*UM1 – mass of Issac’s car

V1 – Initial velocity of Issac’s car

M2 – mass of trolley

U – final velocity of the car and trolley together1700*30=(1700+800)*U So, U = 20.4 m/s

It is Perfectly inelastic collision .

M1*V1=(M1+M2)*UM1 – mass of Issac’s car

V1 – Initial velocity of Issac’s car

M2 – mass of trolley

U – final velocity of the car and trolley together1700*30=(1700+800)*U So, U = 20.4 m/s

2) than zone longer, Mike’s car safety

Source:

http://en.wikipedia.org/wiki/Crumple_zon…

3)

W=F*D*COS (A)

W – work

F – force

D- distance

A – angle

W=900*40*COS(50)=23140.35 J

4)

P=W/t

P – Power

t – time

P=23140.35/20=1157.02 Watt

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