Charge of uniform density 90 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 2.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis)
a. 1.9 V
b. 1.4 V
c. 2.2 V
d. 2.8 V
e. 4.0 V
B
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Wind blowing over the top of a hill
A) increases atmospheric pressure there. B) decreases atmospheric pressure there. C) does not affect atmospheric pressure there.
An object of mass m is attached to a spring of spring constant k and it is pulled so that it starts to oscillate at its natural frequency f. Now the spring is cut in half and the experiment is repeated. What will be the new frequency of vibration?
1. f 2. f/?2 3. f?2 4. 2f
A rectangular conducting loop is placed near a long wire carrying a current I as shown in Figure OQ31.3. If I decreases in time, what can be said of the current induced in the loop?
1.The direction of the current depends on the size of the loop.
2.The current is clockwise.
3.The current is counterclockwise.
4.The current is zero.
5.Nothing can be said about the current in the loop without more information.
An aluminum tube (E 5 72 GPa) AB of circular cross section has a pinned support at the base and is pin-connected at the top to a horizontal beam supporting a load Q 5 600 kN. The outside diameter of the tube is 200 mm and the desired factor of safety with respect to Euler buckling is 3.0. The required thickness t of the tube is most nearly:
(A) 8 mm
(B) 10 mm
(C) 12 mm
(D) 14 mm
