Equilibrium: A mobile is shown in the figure. The horizontal supports have negligible mass. Assume that all the numbers given in the figure are accurate to two significant figures. What mass M is required to balance the mobile?
A. 18 g
B. 30 g
C. 36 g
D. 60 g
E. 90 g
Answer: C
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The portrayal of nearly all aliens in movies and on TV as being humanoid is
A) based on the fact that it would be impossible for us to understand anything that wasn't very similar to a human B) realistic because the human form has several unique qualities that make it a good choice for any advanced civilization C) based on the fact that the human form is the only possible form for an advanced civilization D) probably unrealistic because the human form is most likely a result of the particular conditions and events that occurred on the Earth
The assumption of homogeneity states that
a. the Universe looks the same at all epochs. b. the Universe looks the same from all locations over sufficiently great distances. c. the Universe looks the same in all directions over sufficiently great distances. d. the Universe looks the same at all epochs, the Universe looks the same from all locations over sufficiently great distances, and the Universe looks the same in all directions over sufficiently great distances. e. None of the other choices are correct.
Conversion of Units: There are 640 acres in a square mile, 5280 ft in one mile, and 3.28 ft in one meter. How many acres are there in a hectare, which is a square one hundred meters on each side?
Fill in the blank(s) with the appropriate word(s).
An ice cube of mass 100 g and at 0°C is dropped into a Styrofoam cup containing 200 g of water at 25°C. (The latent heat of fusion of water is 80 cal/g and the specific heat capacity of water is 1.0 cal/g C°.) Assuming the cup does not exchange any heat with the outside, what will happen?
A. All of the ice will melt B. Nothing will happen C. All of the water will freeze D. Some of the ice will melt E. Some of the water will freeze