A car is going around an unbanked curved road with a constant speed. What is the

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A car is going around an unbanked curved road with a constant speed. What is the direction of the frictional force keeping the car on the curved road?

Select one:

a. away from the center of the car's circular path

b. towards the center of the car's circular path

c. up towards the sky

d. down towards the earth

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A 650-N force acts in a northwesterly direction. A second 650-N force must be exerted in what direction so that the resultant of the two forces points westward?

Select one:

a. southeasterly direction

b. southwesterly direction

c. northwesterly direction

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You are pushing a safe up an incline (as in Example 4.10 in the text). List all the forces that you would draw in a free body diagram of the safe.

Select one:

a. the gravitational and normal forces

b. the applied and frictional forces

c. the applied and gravitational forces

d. the applied, frictional, gravitational and normal forces

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What are the SI units for angular velocity?

Select one:

a. degrees per second

b. revolutions per second

c. radians per second

d. radians per minute

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Which of the following statements about the arc length is INCORRECT:

Select one:

1. The arc length has units of radians per second.

2. The definition of arc length is the angle subtended by the arc times the radius of the circle.

3. The arc length for an angle of 360 degrees is the circumference of the circle.

Explanation / Answer

A car is going around an unbanked curved road with a constant speed. What is the direction of the frictional force keeping the car on the curved road?

aNSWER: b. towards the center of the car's circular path

centripetal force should act on the body which is dorected toeadrs the center of the circle

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A 650-N force acts in a northwesterly direction. A second 650-N force must be exerted in what direction so that the resultant of the two forces points westward?

answer : b. southwesterly direction

here we need to cancel north ward force which is possible by applying force in south.

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You are pushing a safe up an incline (as in Example 4.10 in the text). List all the forces that you would draw in a free body diagram of the safe.

answer:d. the applied, frictional, gravitational and normal forces

all these forces acts on the body

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What are the SI units for angular velocity?

ANSWER: c. radians per second

As angualr velcoity W = 2pir/T

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Which of the following statements about the arc length is INCORRECT:

answer: 1. The arc length has units of radians per second.

it is measured in only RADIANS

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