General Questions: If you pound a feather with a hammer, which one feels a greater force?
A. always the feather
B. always the hammer
C. The size of the force is always exactly the same on both of them.
D. If the feather moves, then it felt the greater force. Otherwise the force was the same on both.
Answer: C
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____ has a negative charge and a mass about 1800 times small than a proton
a. A neutron b. An electron c. A molecule d. A nucleus e. An isotope
Why do pulsars "pulse"?
A. Their surface expands and contracts rapidly, causing changes in brightness. B. They have extremely fast rotation rates. C. Their rotation axis is misaligned with their magnetic field axis. D. They have extremely strong magnetic fields.
A 10-gram wire that is 6.0 m long is under tension. When a transverse wave of frequency 280 Hz travels along the wire, its wavelength is 0.60 m, and its amplitude is 8.4 mm
How much time does it take for a crest of the transverse wave to travel the length of the wire? A) 36 ms B) 31 ms C) 40 ms D) 44 ms E) 49 ms
Two wires with the same resistance have the same diameter but different lengths. If wire 1 has length L1 and wire 2 has length L2, how do L1 and L2 compare if wire 1 is made from copper and wire 2 is made from aluminum? The resistivity of copper is 1.7 × 10^–5 W•m and the resistivity of aluminum is 2.82 × 10^–5 W•m
a. L1 = 0.36 L2 c. L1 = 0.60 L2 b. L1 = 2.8 L2 d. L1 = 1.7 L2