If the acceleration vector of an object is directed anti-parallel to the velocity vector, then
A) the object is speeding up.
B) the object is slowing down.
C) the object is turning.
D) the object is at rest.
E) this situation would not be physically possible.
B
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Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it really is. Assume a cylindrical bottle with an inner radius of 1.0 cm and an outer radius of 2.0 cm. What percentage of the apparent volume is the real volume?
a. 95% b. 60% c. 80% d. 64% e. 75%
When an inflated balloon is released with its end unsealed and takes off across the room, how is momentum conserved?
a. Momentum is conserved because the balloon is displacing atmosphere molecules from the air around it. b. Momentum is conserved because the balloon is getting smaller. c. Momentum is conserved because the balloon is getting larger. d. Momentum is conserved because the air molecules inside the balloon are moving out in the opposite direction from the balloon's movement. e. Momentum is conserved because the air from the balloon pushes the air behind it.
The cosmic background radiation
a. has a blackbody spectrum b. has its peak emission in the microwave band c. corresponds to a blackbody at a temperature of 2.726 kelvins d. all of the above
The approximate range of human hearing is
A) 10 hertz to 10,000 hertz. B) 20 hertz to 20,000 hertz. C) 40 hertz to 40,000 hertz. D) none of the above