The most energetic photons are
A) X-rays. B) radio. C) gamma rays. D) visible. E) infrared.
C
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Nellie's weight and normal force usually have the same magnitude when she stands on a
A) horizontal surface. B) inclined surface. C) either a horizontal or inclined surface.
Observationally, how can we tell the difference between a white-dwarf supernova and a massive-star supernova?
A) A massive-star supernova is brighter than a white-dwarf supernova. B) A massive-star supernova happens only once, while a white-dwarf supernova can repeat periodically. C) The light of a white-dwarf supernova fades steadily, while the light of a massive-star supernova continues to brighten for many weeks. D) The spectrum of a massive-star supernova shows prominent hydrogen lines, while the spectrum of a white-dwarf supernova does not. E) We cannot yet tell the difference between a massive-star supernova and a white-dwarf supernova.
A machinist turns on the power on to a grinding wheel at time t = 0 s. The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of The wheel is run at that angular velocity for 30 s, and then power is shut off
The wheel slows down uniformly at until the wheel stops. What is the total number of revolutions made by the wheel in this situation? A) 510 B) 280 C) 320 D) 470 E) 750
A Carnot air conditioner operates between an indoor temperature of 20°C and an outdoor temperature of 39°C. How much energy does it need to remove 2000 J of heat from the interior of the house?
A) 105 J B) 780 J C) 340 J D) 520 J E) 130 J