A piece of wood is floating in a bathtub. A second piece of wood sits on top of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?
A) It goes down.
B) It does not change.
C) It goes up.
D) This cannot be determined without knowing the volume of the top piece of wood.
B
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This photograph shows x-ray emission from a supernova remnant. What is the source of the x-rays?
A) hot gas expanding outward from the site of a supernova B) cold gas that will soon give birth to new stars C) accretion disk around a black hole near the center of the supernova remnant D) spots within the remnant where hot gas is crashing into and destroying planets
A particle (m = 2.0 ?g, q = ?5.0 ?C) has a speed of 30 m/s at point A and moves (with only electric forces acting on it) to point B where its speed is 80 m/s. Determine the electric potential difference VA ? VB
a. ?2.2 kV b. +1.1 kV c. ?1.1 kV d. +2.2 kV e. +1.3 kV
The coefficients needed to balance the equation Ga + Br2 ? GaBr3 are, respectively,
a. 4, 3, and 2. b. 2, 3, and 2. c. 1, 3, and 2. d. 2, 1, and 2.
An electron has a 2% probability of tunneling through a rectangular potential barrier. If this same energy electron impinged upon another barrier of the same height but twice the thickness, what would be its probability of tunneling?
A) 4% B) 2% C) 1% D) 0.04% E) 0.004%