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Test Bank For Physics for Scientists And Engineers Foundations And Connections 1st Edition by Debora M. Katz
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1. A constant force of 12 N in the positive x direction acts on a 4.0-kg object as it moves from the origin to the point m. How much work is done by the given force during this displacement?
|
a. |
+60 J |
|
b. |
+84 J |
|
c. |
+72 J |
|
d. |
+48 J |
|
e. |
+57 J |
| ANSWER: |
c |
| POINTS: |
2 |
| DIFFICULTY: |
Average |
|
2. A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
|
a. |
78 J |
|
b. |
82 J |
|
c. |
85 J |
|
d. |
74 J |
|
e. |
43 J |
| ANSWER: |
c |
| POINTS: |
2 |
| DIFFICULTY: |
Average |
|
3. A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
|
a. |
+0.29 kJ |
|
b. |
−0.29 kJ |
|
c. |
+30 J |
|
d. |
−30 J |
|
e. |
−50 J |
| ANSWER: |
b |
| POINTS: |
2 |
| DIFFICULTY: |
Average |
|
4. How much work is done by a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?
|
a. |
0.22 kJ |
|
b. |
0.20 kJ |
|
c. |
0.24 kJ |
|
d. |
0.27 kJ |
|
e. |
0.31 kJ |
| ANSWER: |
b |
| POINTS: |
2 |
| DIFFICULTY: |
Average |
|
5. A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
|
a. |
+2.0 J |
|
b. |
+20 J |
|
c. |
−2.0 J |
|
d. |
−20 J |
|
e. |
+40 J |
| ANSWER: |
d |
| POINTS: |
2 |
| DIFFICULTY: |
Average |
|
6. A 2.0-kg particle has an initial velocity of m/s. Some time later, its velocity is m/s. How much work was done by the resultant force during this time interval, assuming no energy is lost in the process?
|
a. |
17 J |
|
b. |
49 J |
|
c. |
19 J |
|
d. |
53 J |
|
e. |
27 J |
| ANSWER: |
a |
| POINTS: |
2 |
| DIFFICULTY: |
Average |
|
7. A block is pushed across a rough horizontal surface from point A to point B by a force (magnitude P = 5.4 N) as shown in the figure. The magnitude of the force of friction acting on the block between A and B is 1.2 N and points A and B are 0.5 m apart. If the kinetic energies of the block at A and B are 4.0 J and 5.6 J, respectively, how much work is done on the block by the force P between A and B?
|
a. |
2.7 J |
|
b. |
1.0 J |
|
c. |
2.2 J |
|
d. |
1.6 J |
|
e. |
3.2 J |
| ANSWER: |
c |
| POINTS: |
2 |
| DIFFICULTY: |
Average |
|
8. A constant force of 15 N in the negative y direction acts on a particle as it moves from the origin to the point m. How much work is done by the given force during this displacement?
|
a. |
+45 J |
|
b. |
−45 J |
|
c. |
+30 J |
|
d. |
−30 J |
|
e. |
+75 J |
| ANSWER: |
b |
| POINTS: |
2 |
| DIFFICULTY: |
Average |
|
| 9. An object moving along the x axis is acted upon by a force Fx that varies with position as shown. How much work is done by this force as the object moves from x = 2 m to x = 8 m?
|
a. |
−10 J |
|
b. |
+10 J |
|
c. |
+30 J |
|
d. |
−30 J |
|
e. |
+40 J |
| ANSWER: |
c |
| POINTS: |
2 |
| DIFFICULTY: |
Average |
|
| 10. A body moving along the x axis is acted upon by a force Fx that varies with x as shown. How much work is done by this force as the object moves from x = 1 m to x = 8 m?
|
a. |
−2 J |
|
b. |
−18 J |
|
c. |
−10 J |
|
d. |
−26 J |
|
e. |
+18 J |
| ANSWER: |
d |
| POINTS: |
2 |
| DIFFICULTY: |
Average |
|
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