L dwarfs and T dwarfs are spectral classes of _____
A) brown dwarf stars
B) red giant stars
C) Y dwarf stars
D) white giant stars
A
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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.
What will be an ideal response?
You are on the surface of an object, and you have a fairly clear view out into space. Unfortunately, you are also very squashed. The light you observe from distant objects is slightly blueshifted
The surface of the object is composed primarily of carbon and oxygen, and the distance to the horizon seems about the same as that on Earth. By observing the sky for a few weeks, you realize that there are several planets orbiting your object. Where are you? A) You are on the surface of a neutron star. B) You are on the surface of the Earth. C) You are on the surface of a planet that is somewhat more massive than the Earth. D) You are on the surface of a white dwarf. E) You are "on" an accretion disk around a black hole.
As a hot iron ring cools, the diameter of the hole
A) increases. B) decreases. C) remains the same.
The mass of the deuteron