While the gondola is rising at a speed of 2.0 m/s, a passenger in a balloon-supported gondola throws a small ball down at a speed of 5.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
A. 2.0 m/s, up.
B. 3.0 m/s, down.
C. 3.0 m/s, up.
D. 5.0 m/s, down.
E. 12.8 m/s, down.
Answer: B
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If an extrasolar planet suddenly became more massive, but kept the same radius and orbit, what would change during an observed transit?
A) The amount of starlight would have a larger dip during the transit. B) The amount of starlight would have a smaller dip during the transit. C) The time between transits would decrease. D) The time between transits would increase. E) Nothing. The mass of a planet does not affect the appearance of a transit.
What prevents stars greater than about 100 times the Sun's mass from existing?
A) The rate of thermal expansion would overcome gravitational attraction leading to explosion. B) The gravitational attraction would overcome the rate of thermal expansion leading to a black hole. C) Fusion cannot take place at these higher mass levels. D) The gaseous material of the universe is too widely dispersed to allow for the formation of stars of this mass.
In the two-slit experiment, for the condition of bright fringes, the value of m = +4 corresponds to a path difference of
A) 4? B) 3? C) 2? D) ? E) (1/2)?
If a virtual image is formed 8.00 cm along the principal axis from a convex mirror of focal length –15.0 cm, how far is the object from the mirror?
a. 30.0 cm c. 3.00 cm b. 6.00 cm d. 17.1 cm