Objects in the Kuiper belt:
A) are in random orbits at all inclinations to the ecliptic.
B) lie beyond the orbit of Neptune, and close to the ecliptic.
C) are the sources of long-period comets.
D) are dense, like the iron meteorites.
E) lie beyond the orbit of Neptune and perpendicular to the ecliptic.
B
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The motion of the tectonic plates is driven by
A) the gravitational pull of the Moon and Sun. B) the elliptical nature of Earth's orbit. C) heat moving by convection. D) magnetic repulsion. E) Earth's subsurface convection cycle.
A stature that is 3.0 cm tall statue is 24 cm in front of a concave mirror. The magnitude of the radius of curvature of the mirror is 20 cm
(a) Is the image real or virtual? (b) How far is the image from the mirror? (c) Is the image upright or inverted? (d) How tall is the image?
A ball is projected upward at time t = 0 s, from a point on a flat roof 90 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground
The initial velocity of the ball is Consider all quantities as positive in the upward direction. The vertical velocity of the ball when it is above the ground is closest to A) -81 m/s. B) -64 m/s. C) -48 m/s. D) -32 m/s. E) -97 m/s.
Which of the following general statements about Earth's atmosphere is not true?
A) The nitrogen and oxygen in Earth's atmosphere keep the surface pleasantly warm. B) Atmospheric pressure decreases with altitude. C) Even in low-Earth orbit, some atmospheric gas is still present. D) Atmospheric scattering of light explains why our daytime sky is bright and blue.