Essentially, the first law of thermodynamics says that:
a. one form of energy cannot be converted into another
b. entropy is increasing in the universe
c. energy can be neither created nor destroyed
d. energy cannot be converted into matter or matter into energy
e. energy is the capacity to do work
c
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The Sun's composition (by mass) is approximately
A) 100 percent hydrogen and helium. B) 50 percent hydrogen, 25 percent helium, 25 percent other elements. C) 70 percent helium, 28 percent hydrogen, 2 percent other elements. D) 70 percent hydrogen, 28 percent helium, 2 percent other elements. E) 98 percent hydrogen, 2 percent helium, and other elements.
Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than Star 2 by a factor of 100. What can you conclude? (Neglect any effects that might be caused by interstellar dust and gas.)
A) Without first knowing the distances to these stars, you cannot draw any conclusions about how their true luminosities compare to each other. B) The luminosity of Star 1 is a factor of 100 less than the luminosity of Star 2. C) Star 1 is 100 times more distant than Star 2. D) Star 1 is 100 times nearer than Star 2. E) Star 1 is 10 times more distant than Star 2.
A plane has an airspeed of 142 m/s. A 30.0 m/s wind is blowing southward at the same time as the plane is flying. What must be the direction of the plane in order to move due east relative to the ground?
A) 78.1° north of east B) 11.9° north of east C) 77.8° north of east D) 12.2° north of east E) 55.3° north of east
Three long, straight, parallel wires each carry a current of 10 A in the positive x direction. If the distance between each wire and the other two is 10 cm, what is the magnitude of the magnetic force on a 20-cm length of either of the wires?
a. 57 mN b. 40 mN c. 69 mN d. 50 mN e. 20 mN