There is a main sequence mass-luminosity relation because
a. helium fusion produces carbon.
b. stars expand when they become giants.
c. more massive stars support their larger weight by making more energy.
d. the helium flash occurs in degenerate matter.
e. all stars on the main sequence have about the same radius.
C
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A 5.0-g particle moving 60 m/s collides with a 2.0-g particle initially at rest. After the collision each of the particles has a velocity that is directed 30° from the original direction of motion of the 5.0-g particle. What is the speed of the 2.0-g particle after the collision?
a. 72 m/s b. 87 m/s c. 79 m/s d. 94 m/s e. 67 m/s
Two uniform solid balls, one of radius R and mass M, the other of radius 2R and mass 8M, roll down a high incline. They start together from rest at the top of the incline. Which one will reach the bottom of the incline first?
A) The small sphere arrives first. B) Both reach the bottom at the same time. C) The large sphere arrives first.
Sublimation is a change of phase from solid to gas without
A) passing through the liquid phase. B) a transfer of energy. C) a change of temperature.
The position of an object that is oscillating on a spring is given by the equation x = (18.3 cm) cos[(2.35 s-1)t]. What are the (a) frequency, (b) amplitude, and (c) period of this motion?
What will be an ideal response?