Broward College - Central Campus
PHY2053
Review Chapter 7
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) A traveler pulls on a suitcase strap at an angle 36° above the horizontal. If 555 J of work
are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the
tension in the strap?
A) 56 N
B) 37 N
C) 46 N
D) 52 N 1) 2) A 30-N box is pulled upward 6.0 m along the surface of a ramp that rises at 37° above
the horizontal. How much work does gravity do on the box during this process?
A) -1100 J
B) -110 J
C) 120 J
D) -180 J
E) -140 J 2) 3) Matthew pulls his little sister Sarah along the horizontal ground in a wagon. He exerts a
force on the wagon of 60.0 N at an angle of 37.0° above the horizontal. If he pulls her a
distance of 12.0 m, how much work does Matthew do?
A) 433 J
B) 720 J
C) 575 J
D) 185 J 3) 4) Find the net work done by friction on a box that moves in a complete circle of radius
1.82 m on a uniform horizontal floor. The coefficient of kinetic friction between the floor
and the box is 0.25, and the box weighs 65.0 N.
A) 0 J
B) 370 J
C) 190 J
D) 1800 J 4) 5) A person carries a 25.0-N rock through the path shown in the figure, starting at point A
and ending at point B. The total time from A to B is 1.50 min. How much work did
gravity do on the rock between A and B? 5) A) 75 J B) 275 J C) 0 D) 20.0 J 1 J E) 625 J 6) A person carries a 2.00-N pebble through the path shown in the figure, starting at point A
and ending at point B. The total time from A to B is 6.75 min. How much work did
gravity do on the rock between A and B? A) -36.0 J B) -56.0 J C) 30.0 J D) -30.0 J E) 6) 56.0 J 7) How much kinetic energy does a 0.30-kg stone have if it is thrown at 44 m/s?
A) 510 J
B) 290 J
C) 440 J
D) 580 J 7) 8) A 1000-kg car is moving at 15 km/h. If a 2000-kg truck has 23 times the kinetic energy
of the car, how fast is the truck moving?
A) 41 km/h
B) 61 km/h
C) 72 km/h
D) 51 km/h 8) 9) What is the minimum energy needed to change the speed of a 1600-kg sport utility
vehicle from 15.0 m/s to 40.0 m/s?
A) 20.0 kJ
B) 40.0 kJ
C) 1.10 MJ
D) 10.0 kJ
E) 0.960 MJ 9) 10) A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J. It hits a wall
and comes back with half its original speed. What is the kinetic energy of this object at
this point?
A) 0.50 J
B) 1.0 J
C) 4.0 J
D) 0.25 J
E) 2.0 J 10) 11) When a car of mass 1167 kg accelerates from 10.0 m/s to some final speed, 4.00 × 105 J
of work are done. Find this final speed.
A) 25.2 m/s
B) 28.0 m/s
C) 30.8 m/s
D) 22.4 m/s 11) 12) A 12) 13) A 13) stone initially moving at 8.0 m/s on a level surface comes to rest due to friction after it
travels 11 m. What is the coefficient of kinetic friction between the stone and the
surface?
A) 0.80
B) 0.43
C) 0.25
D) 0.13
E) 0.30
driver, traveling at 22 m/s, slows down her 2000 kg truck to stop for a red light. What
work is done on the truck by the friction force of the road?
A) -9.7 × 105 J
B) -4.4 × 104 J
C) -2.2 × 104 J
D) -4.8 × 105 J 2 14) In 14) 15) A 15) 16) A 16) a ballistics test, a 28-g bullet pierces a sand bag that is 30 cm thick. If the initial bullet
velocity was 55 m/s and it emerged from the sandbag moving at 18 m/s, what was the
magnitude of the friction force (assuming it to be constant) that the bullet experienced
while it traveled through the bag?
A) 38 N
B) 1.3 N
C) 13 N
D) 130 N
10-kg mass, hung by an ideal spring, causes the spring to stretch 2.0 cm. What is the
spring constant (force constant) for this spring?
A) 20 N/m
B) 49 N/cm
C) 5.0 N/cm
D) 0.0020 N/cm
E) 0.20 N/cm
child pulls on a wagon with a force of 75 N. If the wagon moves a total of 42 m in
3.1 min, what is the average power delivered by the child?
A) 21 W
B) 26 W
C) 17 W
D) 22 W 3 Answer Key
Testname: REVIEW CHAPTER 7 1) C
2) B
3) C
4) C
5) C
6) D
7) B
8) D
9) C
10) A
11) B
12) E
13) D
14) D
15) B
16) C 4

 

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