How much heat, in joules, is required to convert 1.00 kg of ice at 0°C into steam at 100°C? (LF,ice = 333 J/g; LV,steam = 2.26 × 103 J/g.)
A. 3.35 × 105
B. 4.19 × 105
C. 2.36 × 106
D. 2.69 × 106
E. 3.01 × 106
Answer: E
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From an observational standpoint, what is a pulsar?
A) an object that emits flashes of light several times per second (or even faster), with near perfect regularity B) a star that slowly changes its brightness, getting dimmer and then brighter, with a period of anywhere from a few hours to a few weeks C) an object that emits random "pulses" of light, sometimes with only a fraction of a second between pulses and other times with several days between pulses D) a star that changes color rapidly, from blue to red and back again
A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case. Case A: Thrown straight up. Case B: Thrown straight down
Case C: Thrown out at an angle of 45° above horizontal. Case D: Thrown straight out horizontally. In which case will the speed of the stone be greatest when it hits the water below if there is no significant air resistance? A) Case A B) Case B C) Case C D) Case D E) The speed will be the same in all cases.
Two waves travel simultaneously through the same medium. The first wave is described by y1(x,t) = (2.00 cm)cos[kx-?t] and the second wave by y2(x,t) = (3.00 cm)sin(kx-?t)
What is the amplitude of the resulting wave? A) 1.00 cm B) 2.50 cm C) 3.61 cm D) 5.00 cm E) 3.94 cm
Ray says that interference effects cannot be observed with visible light because random phase changes occur in time intervals less than a nanosecond. Stacy says that doesn't matter if collimated light from a single source reaches multiple openings. (They are arguing about a light source 50.0 cm away from two 0.0100-mm-wide slits, 2.00 mm apart, with a screen 1.00 m away from the slits.) Which one, if either, is correct, and why?
A. Ray, because the phases at the two slits will be random and different. B. Ray, because it takes light over 3 ns to travel 1.00 m to the screen. C. Stacy, because the difference in time of travel from the source to the slits is no more than about 7 × 10?12 s. D. Stacy, but only if a lens is placed in front of the slits. E. Both, because interference of light never occurs outside a physics lab.