Physics For Scientists And Engineers 9th Edition By Serway – Test Bank

Physics For Scientists And Engineers 9th Edition By Serway – Test bank

Chapter 11—Angular Momentum

MULTIPLE CHOICE

1. Two vectors lying in the xy plane are given by the equations and . The value of is
a. 19
b. 11
c. 19
d. 11
e. 10

ANS: C PTS: 2 DIF: Average

2. Two vectors lying in the xz plane are given by the equations and . The value of is
a.
b.
c. 7
d. 7
e.

ANS: D PTS: 2 DIF: Average

3. A particle located at the position vector m has a force N acting on it. The torque about the origin is
a. (1 )Nm
b. (5 )Nm
c. (1 )Nm
d. (5 )Nm
e. (2 + 3 )Nm

ANS: A PTS: 2 DIF: Average

4. A car of mass 1 000 kg moves with a speed of 50 m/s on a circular track of radius 100 m. What is the magnitude of its angular momentum (in kgm2/s) relative to the center of the race track?
a. 5.0  102
b. 5.0  106
c. 2.5  104
d. 2.5  106
e. 5.0  103

ANS: B PTS: 2 DIF: Average

5. A solid cylinder of radius R = 1.0 m and mass 10 kg rotates about its axis. When its angular velocity is 10 rad/s, its angular momentum (in kgm2/s) is
a. 50.
b. 20.
c. 40.
d. 25.
e. 70.

ANS: A PTS: 2 DIF: Average

6. A particle whose mass is 2 kg moves in the xy plane with a constant speed of 3 m/s in the x direction along the line y = 5. What is its angular momentum (in kgm2/s) relative to the origin?
a. 30
b. 30
c. 15
d. 15
e. 45

ANS: A PTS: 2 DIF: Average

7. A particle whose mass is 2 kg moves in the xy plane with a constant speed of 3 m/s along the direction . What is its angular momentum (in kgm2/s) relative to the origin?
a. 0
b.
c.
d. 6
e. 6

ANS: A PTS: 1 DIF: Easy

8. A particle whose mass is 2.0 kg moves in the xy plane with a constant speed of 3.0 m/s along the direction . What is its angular momentum (in kgm2/s) relative to the point (0, 5.0) meters?
a. 12
b. 11
c. 13
d. 14
e. 21

ANS: E PTS: 2 DIF: Average

9. In the figure, a 1.6-kg weight swings in a vertical circle at the end of a string having negligible weight. The string is 2 m long. If the weight is released with zero initial velocity from a horizontal position, its angular momentum (in kgm2/s) at the lowest point of its path relative to the center of the circle is approximately

a. 40
b. 10
c. 30
d. 20
e. 50

ANS: D PTS: 2 DIF: Average

10. A massless rope is wrapped around a uniform cylinder that has radius R and mass M, as shown in the figure. Initially, the unwrapped portion of the rope is vertical and the cylinder is horizontal. The linear acceleration of the cylinder is

a. (2/3)g
b. (1/2)g
c. (1/3)g
d. (1/6)g
e. (5/6)g

ANS: A PTS: 2 DIF: Average