A billiard ball collides in an elastic head-on collision with a second identical ball. What is the kinetic energy of the system after the collision compared to that before collision?
a. the same as
c. twice
b. one fourth
d. four times
A
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One of the factors that escape velocity depends on is the:
A) mass of the celestial body. B) rate of spin of the celestial body. C) magnitude of the surrounding magnetic field. D) rate of atomic reactions within the celestial body.
Circular Motion of Charges: A particle carrying a charge of +e travels in a circular path of radius R in a uniform magnetic field. If instead the particle carried a charge of +2e, the radius of the circular path would have been
A. 2R. B. 4R. C. 8R. D. R/2. E. R/4.
Energy Conservation With Conservative Forces: A roller coaster starts from rest at a height h at the left side of a loop-the-loop, as shown in the figure. It is not attached to the track in anyway, and there is no friction from the track or from air resistance. If the radius of the loop is R = 6.0 m, what is the minimum height h for which the roller coaster will not fall off the track at the top of the loop?
A. 21 m B. 18 m C. 15 m D. 12 m E. 8.5 m
Describe some of the early theories for why the Sun shines and why they are no longer accepted as viable
What will be an ideal response?