Most of the waves in the electromagnetic spectrum are
A) red light.
B) blue light.
C) green light.
D) invisible.
Answer: D
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Two masses m1 and m2, with m1 = 3 m2, undergo a head-on elastic collision. If the particles were approaching with speed v before the collision, with what speed are they moving apart after collision?
a. 3 v b. v/3 c. 3v/4 d. v
A violation of the second law of thermodynamics would occur if
a. a ball lying on the ground started to bounce. b. transfer of energy by heat moved energy from an object at low temperature to an object at a higher temperature. c. a refrigerator heated the air in the room in which the refrigerator is located. d. any of the above occurred. e. (a) or (b) occurred, but not (c).
For the maximum induced emf in the coil of a generator, the term sin ?t has a value of zero
Indicate whether the statement is true or false
A fluid at 40ºC flows at 8 m/s along a flat plate that is 3 m long. The plate is maintained at 100ºC. Determine the local convective heat transfer coefficient and the average convective heat transfer coefficient using 4 x 105 as the critical Reynolds number, for
a) Air at 100 kPa b) Water at 100 kPa