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(Figure 1) shows the angular velocity graph of the crankshaft in a car. Part A W

ID: 1657349 • Letter: #

Question

(Figure 1) shows the angular velocity graph of the crankshaft in a car.

Part A

What is the crankshaft's angular acceleration at t = 1 s?

Express your answer using two significant figures.

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Part B

What is the crankshaft's angular acceleration at t = 3 s?

Express your answer using two significant figures.

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Part C

What is the crankshaft's angular acceleration at t = 5 s?

Express your answer using two significant figures.

1 of 1

(Figure 1) shows the angular velocity graph of the crankshaft in a car.

Part A

What is the crankshaft's angular acceleration at t = 1 s?

Express your answer using two significant figures.

= rad/s2

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Part B

What is the crankshaft's angular acceleration at t = 3 s?

Express your answer using two significant figures.

= rad/s2

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Part C

What is the crankshaft's angular acceleration at t = 5 s?

Express your answer using two significant figures.

1 of 1

(rad/s) 250 200 150 100 50 0 t (s) 0 1 2 3 4 5 67

Explanation / Answer

A)

at t=1 s,

acceleration = slope of straight line

= change in y / change in x

= (250 - 50) rad/s / (2-0)s

= 100 rad/s^2

Answer: 100 rad/s^2

B)

At t = 3 s,

w is constant

so,

acceleration = 0 rad/s^2

Answer: 0 rad/s^2

C)

at t=5 s,

acceleration = slope of straight line

= change in y / change in x

= (100 - 250) rad/s / (7-4)s

= -150/3 rad/s^2

= -50 rad/s^2

Answer: -50 rad/s^2

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