Physics

# Problems

PhysicsProblems

### Problems

#### 6.1Angle of Rotation and Angular Velocity

16.
What is the angle of rotation (in degrees) between two hands of a clock, if the radius of the clock is 0.70\,\text{m} and the arc length separating the two hands is 1.0\,\text{m}?
1. 40^\circ
2. 80^\circ
3. 81^\circ\!
4. 163^\circ
17.
A clock has radius of 0.5\,\text{m}. The outermost point on its minute hand travels along the edge. What is its tangential speed?
1. 9\times10^{-4}\,\text{m/s}
2. 3.4\times10^{-3}\,\text{m/s}
3. 8.5\times10^{-2}\,\text{m/s}
4. 1.3\times10^1\,\text{m/s}

#### 6.2Uniform Circular Motion

18.

What is the centripetal force exerted on a 1,600 kg car that rounds a 100 m radius curve at 12 m/s?

1. 192 N
2. 1, 111 N
3. 2, 300 N
4. 13, 333 N
19.

Find the frictional force between the tires and the road that allows a 1,000 kg car traveling at 30 m/s to round a 20 m radius curve.

1. 22 N
2. 667 N
3. 1, 500 N
4. 45, 000 N

#### 6.3Rotational Motion

20.

An object’s angular acceleration is 36 rad/s2. If it were initially spinning with a velocity of 6.0 m/s, what would its angular velocity be after 5.0 s?

21.

When a fan is switched on, it undergoes an angular acceleration of 150 rad/s2. How long will it take to achieve its maximum angular velocity of 50 rad/s?

1. −0.3 s
2. 0.3 s
3. 3.0 s
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