A fan attached to an ice sailcraft stalled on a windless day blows air into the sail that bounces backward upon impact. The boat
A) moves in the direction of the wind impact force.
B) does not move by this wind impact.
C) moves, but in the opposite direction of the wind impact force.
Answer: A
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Exclusion Principle: In a hydrogen atom, an electron with n = 7 can exist in how many different quantum states?
A. 6 B. 7 C. 15 D. 98
Is the "sports wave" that crowds perform at sports arenas really a "wave" as physicists define the term?
A) Yes, because a disturbance does move from one point to another without a corresponding transfer of matter, and this is what we mean by a "wave" in physics. B) Yes, because energy does move through the crowd from one point to another, and this is what we mean by a "wave" in physics. C) No, because there is no real physical connection between the different parts of the medium. D) No, because spectators have free will--that is, they are not really forced to stand up and participate. E) No, for both the reasons stated in answers C and D.
A foul ball is hit straight up into the air with a speed of 30 m/s, and air resistance is negligible. (a) Calculate the time required for the ball to rise to its maximum height
(b) Calculate the maximum height reached by the ball above the point where it hit the bat. (c) Determine the times at which the ball passes a point 25 m above the point where it was hit by the bat. (d) Explain why there are two answers to part (c).
The ampere is defined
A) as a coulomb-second. B) as 4? × 10-5 SI units. C) as a coulomb/second2. D) as 4? × 10-7 SI units. E) using the force between current carrying wires.