A carbon atom with six protons, seven neutrons, and five electrons has
Ans: atomic number = 6 and atomic mass number = 13
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A metal sample of mass M requires a power input P to just remain molten. When the heater is turned off, the metal solidifies in a time T. The specific latent heat of fusion of this metal is:
A. P/MT B. T /PM C. PM/T D. PMT E. P T /M
A particle moves east at constant velocity v r for a time interval ?T. It then moves north at a constant velocity, with the same speed as before, for another time interval ?T. Finally it moves east again with the original velocity. At the instant an additional time interval ?T has elapsed, which of the following are true about the average velocity and the average acceleration for the motion described?
a. The average velocity is v r and the average acceleration is zero. b. The average velocity is v r and the average acceleration is not zero. c. The average velocity is not v r and the average acceleration is zero. d. The average velocity is not v r and the average acceleration is not zero.
A home fireplace loses most of its heat by
a. radiation into the room. b. convection up the chimney. c. radiation up the chimney. d. conduction to the sides of the fireplace.
A hornet circles around a pop can at increasing speed while flying in a path with a 12-cm diameter. We can conclude that the hornet's wings must push on the air with force components that are
a. straight down. b. down and inwards. c. down and outwards. d. down and backwards. e. down, backwards and outwards.