High-speed stroboscopic photographs show that the head of a golf club of mass 200 grams is traveling at 55.0 m/s just before it strikes a 46.0-gram golf ball at rest on a tee. After the collision, the clubhead travels (in the same direction) at 40.0 m/s. Find the speed of the golf ball just after impact
65.2 m/s
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The internal energy of an ideal gas is changed by adding heat Q to the system and also by doing work W on the gas. What is the change in internal energy of the gas?
A) 4.186Q - W B) Q - 4.186W C) W - Q D) Q + W E) Q - W
Exclusion Principle: In its ground state, the quantum numbers (n, ?, m1, ms) for hydrogen are, respectively,
A. 1, 1, 1, 1. B. 1, 0, 0, 0. C. 1, 0, 0, ±1/2. D. 1, 1, 1, ±1/2.
My hair dryer is rated at 1500. watts and my television only uses 100. watts, so why do I pay more for electricity for my TV than for my hair dryer in a year?
What will be an ideal response?
Which is the most efficient means of recording light?
A. photographic films B. photomultiplier tubes C. the human eye D. charge-coupled device (CCD)