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.
B
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Energy in Inductors: An inductor stores energy in its magnetic field.
A. True B. False
A uniform rod is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at an angle of 30° above the horizontal. What is the angular acceleration of the rod at the instant it is released?
A. 4.7 rad/s2 B. 6.9 rad/s2 C. 6.4 rad/s2 D. 5.6 rad/s2 E. 4.2 rad/s2
The force due to gravity between two objects can be described using the equation Fg = G M1 M2 / d2. In this equation, what does G represent?
A) the distance between the two objects B) the universal gravitational constant C) the density of the smaller object
The value of a wavelength in the Balmer series is 372.1 nm. What is the corresponding value of n?
A) 6 B) 3 C) 9 D) 10 E) 14