The amount and distribution of matter in the Milky Way Galaxy is determined by
A) counting the number of stars in the galaxy.
B) determining the amount of gas and dust in the galaxy.
C) studying where stars are located in the Milky Way.
D) studying the rotation of the galaxy.
E) adding together the mass of the galaxy's stars and gas.
D) studying the rotation of the galaxy.
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The heat of vaporization of ethyl alcohol Lv is about 200 cal/g. That means that 1 gram of this refrigerant upon vaporization would release
A) less then 200 calories. B) 200 calories. C) more than 200 calories.
If a 1H nucleus, a 2H nucleus, and a 3H nucleus all had the same momentum, which one has the greatest de Broglie wavelength?
a. 1H b. 2H c. 3H d. All three have the same de Broglie wavelength.
When a light ray meets an interface between two media, the angle of refraction is _______ the angle of incidence.
A. Always less than B. Always greater than C. May be greater than, equal to, or less than D. Equal to
A hoop (I = MR2) is rolling along the ground at 10 m/s. It comes to a hill and starts going up. Assuming no losses to friction, how far does it travel vertically up the hill before it stops?
a. 10 m c. 5.1 m b. 3.7 m d. 7.7 m