How were the rings of Uranus discovered?
A) photometric observations of the occultation of a star made from Earth
B) by Percival Lowell, who observed two "bumps" on either side of Uranus
C) by William Herschel, while he also found the two largest moons
D) by Voyager 2 when it passed by Uranus in 1986
E) by the Hubble Space Telescope in the infrared
A
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A geosynchronous satellite:
a. must be close enough to Earth's surface that the gravitational acceleration, g, remains essentially the same. b. remains stationary in space. c. remains directly above a specific location on Earth's surface. d. revolves around the Moon, not Earth. e. takes one week to complete a revolution around Earth.
Calculate the thermal conductivity of carbon bisulfide using Equation 2-6 and compare this result to the listed value in Table 2-2.
An airplane with a wingspan of 60.0 m flies parallel to the Earth's surface at a point where the downward component of the Earth's magnetic field is 0.400 × l0-4 T. If the induced potential between wingtips is 0.600 V, what is the plane's speed?
a. 338 m/s c. 250 m/s b. 375 m/s d. 417 m/s
A 7.0-kg bowling ball experiences a net force of 6.0 N. What will be its acceleration?
a. 0.86 m/s2 c. 7.0 m/s2 b. 6.0 m/s2 d. 42 m/s2