Observations indicate that the Moon has water ice in craters near the poles. Where do scientists suspect this water came from?
A) ice brought by comet impacts long ago
B) ice supplied to the Moon by impacts that occurred within the past century or so
C) the ice formed from the condensation of water released by outgassing on the Moon
D) The Moon has significant amounts of water bonded in its crust, so some of this water fills the polar craters.
A) ice brought by comet impacts long ago
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Water that does not infiltrate into the ground or evaporate becomes
A) groundwater. B) runoff. C) soil moisture. D) hydrologic cycle.
A nonuniform linear charge distribution given by l(x) = bx, where b is a constant, is distributed along the x axis from x = 0 to x = +L. If b = 40 nC/m2 and L = 0.20 m, what is the electric potential (relative to a potential of zero at infinity) at the point y = 2L on the y axis?
a. 19 V b. 17 V c. 21 V d. 23 V e. 14 V
The absolute temperature of an ideal gas is directly proportional to which of the following?
A. speed B. momentum C. kinetic energy D. mass
The hottest star is the one that glows
A) red. B) white. C) blue. D) need more information