Seismic waves are most useful for mapping:
A) the surface of Venus with Magellan.
B) the surface of Mars with Global Surveyor.
C) the Earth's core and mantle.
D) the density of the hydrosphere.
E) the depths of the oceans.
C
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Halley's comet has an elliptical orbit around the Sun with a period of 76.0 years. At its closest approach (perihelion) it is 8.82 × 1010 m from the Sun and has a speed of 54.6 km/s
How fast is it moving at its furthest point from the Sun (aphelion)? The mass of the Sun is 2.00 × 1030 kg and G = 6.67 x 10-11 N•m2/kg2. A) 604 m/s B) 802 m/s C) 1070 m/s D) 1540 m/s E) 1860 m/s
A lawn mower has a 6-horsepower engine (1 HP = 750 W). If the engine has an efficiency of 20%, and the throttle is such that the engine cycles 10 times a second, the heat that is expelled in one cycle is
A. 1 800 J B. 2 000 J C. 2 200 J D. 2 400 J E. 2 250 J
The lithosphere consists of
a. all of the crust's depth. b. all of the crust's depth and part of the mantle's depth. c. part of the crust's depth. d. all of the crust's depth and all of the mantle's depth.
This figure shows the life track of a 1 solar-mass star from its beginnings in a collapsing cloud fragment until it becomes a main-sequence star. At which of the numbered points is the object generating energy primarily from hydrogen fusion?
A) Point 4 only B) Point 1 only C) Point 2 only D) Point 3 only E) Points 1, 2, and 3 F) Points 1 and 2 only