Physics

# Problems

PhysicsProblems

### 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 $0.70 m$ and the arc length separating the two hands is $1.0 m$?
1. $40 Superscript ring$
2. $80 Superscript ring$
3. $81 Superscript ring$
4. $163 Superscript ring$
17.
A clock has radius of $0.5 m$. The outermost point on its minute hand travels along the edge. What is its tangential speed?
1. $9 times 10 Superscript negative 4 Baseline m slash s$
2. $3.4 times 10 Superscript negative 3 Baseline m slash s$
3. $8.5 times 10 Superscript negative 4 Baseline m slash s$
4. $1.3 times 10 Superscript 1 Baseline m slash s$

### 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