Mantle material behaves like a gas
a. True
b. False
Indicate whether the statement is true or false
False
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Which of the following has been the most important for maintaining the Earth's stable climate over the time it took for large organisms to evolve?
A) impacts of water-bearing planetesimals B) the ending of the heavy bombardment C) plate tectonics D) the tides E) deep sea volcanic vents
A sprinter named Ben has challenged a beam of light to a race in the 100-m dash. The race is held in a stadium full of spectators. At the start signal, a laser beam is turned on at the start line, pointed down the track. At the same instant, Ben bursts out of the starting blocks at 99% of the speed of light (0.99c). According to Ben, what happens?
A) The light beam moves out ahead of him at the full speed of light, winning the race easily. B) The light beam gradually pulls ahead of him and wins the race because it is going 1% of the speed of light faster than him. C) The light beam instantly finishes the race, before Ben even has a chance to start. D) Ben wins the race and becomes a hero.
A person tries to heat up her bath water by adding 5.0 L of water at 80°C to 60 L of water at 30°C. What is the final temperature of the water?
What will be an ideal response?
An 18 mm wide diffraction grating has rulings of 710 lines per mm. Light is incident normally on the grating. Monochromatic light of 506 nm wavelength is used. The largest angle from the normal at which an intensity maximum is formed is closest to:
A) 46° B) 44° C) 42° D) 40° E) 38°