课程名称︰普通物理学甲上
课程性质︰大一必修
课程教师︰李庆德
开课学院：电资学院
开课系所︰电机工程学系
考试日期（年月日）︰2014/10/16
考试时限（分钟）：50分钟
试题 :
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General Physics A Quiz( October 16, 2014 )
1. A certain vector in the xy plane has an x-component of 4m and a y-component
of 10m. It is then rotated in the xy plane so its x-component is doubled. Its
new y-component is about:
(A) 20 m (B) 7.2 m (C) 5.0 m (D) 4.5 m (E) 2.2 m
2. A stone is tied to a string and whirled at constant speed in a horizontal
circle. The speed is then doubled without changing the length of the string.
Afterward the magnitude of the acceleration of the stone is:
(A) the same (B) twice as great (C) four times as great
(D) half as great (E) one-fourth as great
3. A girl jogs around a horizontally circle with a constant speed. She travels
one fourth of a revolution, a distance of 25 m along the circumference of the
circle, in 5.0 s. The magnitude of her acceleration is:
(A) 0.31 m/s^2 (B) 1.3 m/s^2 (C) 1.6 m/s^2
(D) 3.9 m/s^2 (E) 6.3 m/s^2
4. A 13-N weight and a 12-N weight are connected by a massless string over a
massless, frictionless pulley. The 13-N weight has a downward acceleration
with magnitude equal to that of a freely falling body times:
(A) 1 (B) 1/12 (C) 1/13 (D) 1/25 (E) 13/25
5. You stand on a spring scale on the floor of an elevator. Of the following,
the scale shows the highest reading when the elevator:
(A) moves downward with increasing speed
(B) moves downward with decreasing speed
(C) remains stationary
(D) moves upward with decreasing speed
(E) moves upward at constant speed
6. A car is traveling at 15 m/s on a horizontal road. The brakes are applied
and the car skids to a stop in 4.0 s. The coefficient of kinetic friction
between the tires and road is:
(A) 0.38 (B) 0.69 (C) 0.76 (D) 0.92 (E) 1.11
7. A box rests on a rough board 10 meters long. When one end of the board is
slowly raised to a height of 6 meters above the other end, the box begins to
slide. The coefficient of static friction is:
(A) 0.8 (B) 0.25 (C) 0.4 (D) 0.6 (E) 0.75
8. A 5.0-kg crate is on an incline that makes an angle 30°with the
horizontal. If the coefficient of static friction is 0.5, the maximum force
that can be applied parallel to the plane without moving the crate is:
(A) 0 (B) 3.3 N (C) 30 N (D) 46 N (E) 55 N
9. An object of mass 1 g is whirled in a horizontal circle of radius 0.5 m at
a constant speed of 2 m/s. The work done on the object during one revolution
is:
(A) 0 (B) 1 J (C) 2 J (D) 4 J (E) 16 J
10. The amount of work required to stop a moving object is equal to the:
(A) velocity of the object
(B) kinetic energy of the object
(C) mass of the object times its acceleration
(D) mass of the object times its velocity
(E) square of the velocity of the object
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