What condition or conditions is/are necessary for static equilibrium?
A) Fy = 0
B) Fx = 0, Fy = 0
C) = 0
D) Fx = 0
E) Fx = 0, Fy = 0, = 0
Question 2About 90 of UFO sightings
A) are hoaxes
B) cannot be explained
C) are real sightings of alien craft
D) can be explained by natural phenomena
Question 3George Gamow, the creator of the Big-Bang theory of the origin of the universe, asks you to imagine what would happen if the speed of light was 15. mi/h.
If you were on the sidewalk looking at a bicyclist ride down the street, how does she look to you while riding, compared to when she stops? A) taller, the same mass, but stretched out like a limousine
B) shorter, the same mass, but stretched out like a limousine
C) same height, greater mass, and flatter in the direction she is moving
D) same height, smaller mass, and flatter in the direction she is moving
E) shorter, greater mass, but stretched out like a limousine
Question 4After World War II, the U.S. Government spent two decades investigating UFOs because they
A) were themselves developing new types of aircraft and used the official investigation as a cover-up
B) thought that they might be new types of aircraft being developed by the Soviet Union
C) knew that UFOs were alien craft and used the official investigation as a cover-up
D) were afraid that an alien civilization was in the process of invading the Earth
Question 5Compared to oceanic crust, continental crust is
A) thinner and denser
B) thicker and less dense
C) thicker and denser
D) thinner and less dense
Question 6A series RL circuit is driven by a 120. V, 60. Hz source. The values of the resistance and inductance are R = 20.0 and L = 160. mH. Determine:
(a) the current.
(b) the phase angle between the current and the applied voltage.