A charged capacitor is connected to an inductor. At time t = 0 the charge on the capacitor is Q = 6?C. At time t = 2 ms the charge on the capacitor is zero for the first time. What is the amplitude of the current at that same instant?
A)
2.38 mA
B)
4.71 mA
C)
0.78 mA
D)
1.53 mA
E)
1.19 mA
B
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Angular Momentum: A solid wooden door, 90 cm wide by 2.0 m tall, has a mass of 35 kg. It is open and at rest. A small 500-g ball is thrown perpendicular to the door with a speed of 20 m/s and hits the door 60 cm from the hinged side, causing it to begin turning. The ball rebounds along the same line with a speed of 16.0 m/s relative to the ground. How much energy is lost during this collision?
A. 30 J B. 16 J C. 15 J D. 13 J E. 4.8 J
A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz. What is the maximum acceleration of the needle?
A) 8.26 cm/s2 B) 16.5 cm/s2 C) 18.1 cm/s2 D) 326 cm/s2 E) 163 cm/s2
We never find isolated, individual quarks because
A) quarks immediately undergo radioactive decay when they are separated. B) quarks are bound tightly together by neutrinos. C) quarks are always attached to electrons. D) the force between quarks is infinitely strong so they cannot be budged. E) whenever quarks are separated, the energy created by the separation creates new quark pairs.
A He-Ne laser (632.8 nm) is used to calibrate a grating. If the first-order maximum occurs at 20.5°, what is the grating constant (the distance between the slits)?
A) 0.905 ?m B) 1.81 ?m C) 2.20 ?m D) 3.62 ?m E) 4.52 ?m