A point charge of +3.0 mC is located at the origin of a coordinate system and a second point charge of -9.0 mC is at x = 1.0 m. At what point on the x axis is the electrical potential zero?
a. +0.33 m
c. +0.25 m
b. -0.25 m
d. +0.75 m
[Ques. 2] A 0.12-m radius grinding wheel takes 2.1 s to speed up from 2.0 rad/s to 11.0 rad/s. What is the wheel's average angular acceleration?
a. 9.6 rad/s2
c. 1.6 rad/s2
b. 4.3 rad/s2
d. 0.33 rad/s2
[Ques. 3] A point charge of +3.0 mC is located at the origin of a coordinate system and a second point charge of -9.0 mC is at x = 1.00 m. What is the electric potential at the x = 0.50 m point? (ke = 8.99 109 Nm2/C2)
a. -5.4 104 V
c. 16 104 V
b. 11 104 V
d. -11 104 V
[Ques. 4] A grindstone spinning at the rate of 12 rev/s has what approximate angular speed?
a. 3.2 rad/s
c. 52 rad/s
b. 26 rad/s
d. 75 rad/s
[Ques. 5] At what distance from a point charge of 14 mC would the electrical potential be 4.2 104 V? (ke = 8.99 109 Nm2/C2)
a. 0.76 m
c. 3.0 m
b. 0.58 m
d. 1.7 m
[Ques. 6] 1300 rev/min is equivalent to which of the following?
a. 2600 rad/s
c. 273 rad/s
b. 136 rad/s
d. 60 rad/s
[Ques. 7] Two point charges of values +3.4 mC and +6.6 mC are separated by 0.20 m. What is the electrical potential at the point midway between the two charges? (ke = 8.99 109 Nm2/C2)
a. +1.8 106 V
c. +0.90 106 V
b. -0.90 106 V
d. +3.6 106 V
[Ques. 8] At liftoff, the engines of the Saturn V rocket consumed 14,000 kg/s of fuel and exhausted the combustion products at 2900 m/s. What was the total upward force (thrust) provided by the engines?
a. 3.77 107 N
c. 1.47 108 N
b. 7.54 107 N
d. 4.06 107 N
[Ques. 9] Find the electrical potential at 0.055 m from a point charge of 6.0 mC. (ke = 8.99 109 Nm2/C2)
a. 1.5 105 V
c. 9.8 105 V
b. 1.2 107 V
d. 3.6 105 V
[Ques. 10] A model rocket sits on the launch pad until its fuel is ignited, blasting the rocket upward. During the short time of blast-off, as the ignited fuel goes down, the rocket goes up because:
a. the fuel pushes on the ground. b. air friction pushes on the escaping fuel.
c. the downward force of gravity on the rocket is less than the rate of downward momentum increase of the fuel.
d. of none of the above reasons.
Quick Reply
