A uniform rod is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at the horizontal position. What is the angular acceleration of the rod at the instant the rod makes an angle of 70° with the horizontal?
a. 3.7 rad/s2
b. 1.3 rad/s2
c. 2.5 rad/s2
d. 4.9 rad/s2
e. 1.9 rad/s2
c
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What is the purpose of adaptive optics?
A) to improve the angular resolution of telescopes in space B) to reduce the distorting effects of atmospheric turbulence for telescopes on the ground C) to increase the collecting area of telescopes on the ground D) to increase the magnification of telescopes on the ground E) to allow several small telescopes to work together like a single larger telescope
A charged capacitor is connected to an ideal inductor. At time t = 0, the charge on the capacitor is equal to 6.00 ?C. At time t = 2.00 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) 0.780 mA D) 1.53 mA E) 1.19 mA
Two speakers in a stereo emit identical pure tones. As you move around in front of the speakers, you hear the sound alternating between loud and zero. This occurs because of __________
Fill in the blank(s) with correct word
A vertically-held sledge hammer is easier to balance when the heavier end is
A) on your hand. B) at the top, away from your hand. C) the same either way