The angle between true north and the direction in which a compass needle points is called the angle of
a. attack.
b. inclination.
c. declination.
d. dip.
c
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Some of the gaps in Saturn's rings, such as the Cassini Division, are caused by ____ with moons
a. tides b. ripples c. rotations d. resonances e. forward scattering
A spacecraft (mass = m1) orbits a planet (mass = m2) in a circular orbit (radius = r). What is the minimum energy required to send this spacecraft to a distant point in space where the gravitational force on the spacecraft by the planet is negligible?
A. Gm1m2/(4r) B. Gm1m2/R C. Gm1m2/(2R) D. Gm1m2/(3R) E. 2Gm1m2/(5R)
Millikan's experiments on balancing charged oil droplets in an electric field first showed that:
a. electrons have a definite charge to mass ratio, which he measured. b. electric charges are integer multiples of a single fixed electron charge, which he measured. c. photons have energy E = hf for frequency f. d. electrons have negative charge. e. protons are positively charged.
After a supernova event, what is left behind?
A) always a white dwarf B) always a neutron star C) always a black hole D) either a white dwarf or a neutron star E) either a neutron star or a black hole