If you wish to expand the volume of a sample of water at 4°C
A) raise its temperature a bit.
B) lower its temperature a bit.
C) either of these
D) neither of these
Answer: C
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Galileo challenged the idea that objects in the heavens were perfect by
A) showing that heavy objects fall at the same rate as lighter objects. B) observing sunspots on the Sun and mountains on the Moon. C) proving Kepler's laws were correct. D) inventing the telescope.
None of the Jovian worlds has a definite solid surface on which you could walk
Indicate whether the statement is true or false
The Flash, a comic superhero, is able to run close to the speed of light. Two people, with synchronized watches, stand several kilometers apart and time the Flash as he runs a straight course. The Flash has his own stopwatch and uses it to independently time his run. The Flash also observes the speed at which the finish line moves toward him, and upon finishing his run he calculates the length of the course by multiplying this speed by the time on his stopwatch. Who measures (I) the Flash's proper time for the race, and who measures (II) the rest or proper length for the race?
A. Both the Flash and the two people measure (I) and (II) B. Only the Flash measures both (I) and (II) C. The two people measure (I) and Flash measures (II) D. Neither the Flash nor the two people measure (I) or (II) E. The Flash measures (I) but the two people measure (II)
A metal having a work function of 2.4 eV is illuminated with monochromatic light whose photon energy is 4.0 eV. What is the maximum kinetic energy of the photoelectrons produced by this light? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 5.5 × 10-19 J B) 2.6 × 10-19 J C) 3.8 × 10-19 J D) 4.7 × 10-19 J E) 6.4 × 10-19 J