When an automobile moves with constant velocity the power developed is used to overcome the frictional forces exerted by the air and the road. If the power developed in an engine is 50.0 hp, what total frictional force acts on the car at 55 mph (24.6 m/s)? One horsepower equals 746 W
1 520 N
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In which city is Polaris highest in the sky?
A) Singapore B) Mexico City C) Denver D) Anchorage E) All the same, depending on the time of night
According to special relativity, two events that occur simultaneously in one frame of reference
A) are also simultaneous in all frames of reference. B) can be non-simultaneous in another frame of reference. C) is evidence for the constant speed of light. D) are in reality non-simultaneous.
The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because
a. we can't measure the radial velocities of each star in the system. b. we can't see the shape or tilt of the orbit. c. we can't find the diameters of the stars. d. we can't determine the luminosities of the stars. e. the Doppler shift is not measurable.
Which of the following are relatively unchanged fragments from the early period of planet building in the solar system?
A) the moons of Mars B) asteroids C) Kuiper belt comets D) Oort cloud comets E) all of the above