How much charge can be placed on a capacitor of plate area 20 cm2 with air between the plates before it reaches atmospheric breakdown where E = 3.0 106 V/m? (e0 = 8.85 10-12 C2/Nm2)
a. 6.6 10-7 C
c. 5.3 10-8 C
b. 2.7 10-8 C
d. 4.0 10-7 C
[Ques. 2] A ceiling fan is turned on and reaches an angular speed of 60 rev/min in 20 s. It is then turned off and coasts to a stop in 40 s. In the one minute of rotation, through how many revolutions did the fan turn?
a. 30
c. 0
b. 60
d. 600
[Ques. 3] A parallel-plate capacitor has dimensions 4.0 cm 5.0 cm. The plates are separated by a 1.0-mm thickness of paper (dielectric constant k = 3.7). What is the charge that can be stored on this capacitor, when connected to a 6.0-V battery? (e0 = 8.85 10-12 C2/Nm2)
a. 4.8 10-9 C
c. 9.8 10-11 C
b. 4.8 10-11 C
d. 3.9 10-10 C
[Ques. 4] A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2 . What is the time interval required for it to reach a 10-rad displacement after starting from rest?
a. 28 s
c. 56 s
b. 2.0 s
d. 18 s
[Ques. 5] The dielectric strength of rutile is 6.0 106 V/m, which corresponds to the maximum electric field that the dielectric can sustain before breakdown. What is the maximum charge that a 10-10-F capacitor with a 0.50-mm thickness of Rutile can hold?
a. 0.30 mC
c. 0.60 C
b. 6.0 C
d. 1.7 nC
[Ques. 6] A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2 . What is its angular speed at the instant it goes through an angular displacement of 10 rad?
a. 0.025 rad/s
c. 0.46 rad/s
b. 0.11 rad/s
d. 0.71 rad/s
[Ques. 7] A sandwich is constructed of two flat pieces of metal (2.00 cm on a side) with a 3.00-mm thick piece of a dielectric called rutile (k = 100) in between them. What is the capacitance? (e0 = 8.85 10-12 C2/Nm2)
a. 177 pF
c. 100 F
b. 118 pF
d. 8.85 F
[Ques. 8] A 0.30-m radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 3.0 rad/s2 over a 5.0-s interval?
a. 12 rad
c. 37 rad
b. 25 rad
d. 0.50 rad
[Ques. 9] Inserting a dielectric material between two charged parallel conducting plates, originally separated by air and disconnected from a battery, will produce what effect on the capacitor?
a. increase voltage
c. increase capacitance
b. increase charge
d. decrease capacitance
[Ques. 10] An object consists of a rod (of length 3.0 m and negligible moment of inertia) to which four small 2.0-kg masses are attached, one at each end and one at each point on the rod 1.0 m from each end. (The masses are one meter apart.) The moment of inertia of this object about an axis perpendicular to the rod and through one of the end masses:
a. is 28 kgm2.
b. is 12 kgm2.
c. is 4 kgm2.
d. cannot be uniquely determined until it is stated which inner mass the axis goes through.
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