An airplane has a mass of 30,000 kg and travels at 300 m/s. If the drag force is 1000 N, the power the engines have to provide to keep flying at a constant speed is
a. 
b. 
c. 
d. 
e. 
e.
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Except Venus and Uranus, all the other planets:
A) rotate in the counterclockwise direction as seen from the north. B) revolve around their moons with their equators almost perpendicular to their orbits as seen from the north. C) revolve around the Sun in the clockwise direction as seen from the north. D) rotate on their sides with their equators almost perpendicular to their orbits as seen from the north.
The ____ Moon is visible above the western horizon a couple of hours before sunrise
a. waning gibbous b. waxing gibbous c. waxing crescent d. waning crescent e. new
Most of the Moon's surface is densely covered with craters, but we find relatively few craters within the lunar maria. What can we conclude?
A) Erosion affects the maria more than it affects other regions of the Moon. B) The maria formed within the past 1 billion years. C) The regions of the maria were hit by fewer impacts than the densely cratered regions. D) The maria formed after the heavy bombardment ended.
Geosynchronous satellites orbit the Earth at a distance of 42 000 km from the Earth's center. Their angular speed at this height is the same as the rotation rate of the Earth, so they appear stationary at certain locations in the sky. What is the force acting on a 1 500-kg satellite at this height?
a. 85.0 N b. 333 N c. 404 N d. 457 N