An astronaut is taking a space walk when his tether breaks. He has a big drill. How can he get back to the space ship?
A. Turn his back to the ship and throw the drill forward
B. Face the ship and throw the drill forward.
C. Throw the drill towards the tether.
A. Turn his back to the ship and throw the drill forward
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You do work on a cart loaded with groceries. If you do this work in one-third the usual time, you expend
A) one third as much power. B) the usual power. C) three times the usual power. D) need more information.
A point charge of 6.0 nC is placed at the center of a hollow spherical conductor (inner radius = 1.0 cm, outer radius = 2.0 cm) which has a net charge of ?4.0 nC. Determine the resulting charge density on the inner surface of the conducting sphere
a. +4.8 ?C/m2 b. ?4.8 ?C/m2 c. ?9.5 ?C/m2 d. +9.5 ?C/m2 e. ?8.0 ?C/m2
If we went back in time 10 billion years, how would we expect a plot of galaxy luminosities against colors to change?
A) The red cloud would be much more sparse. B) The blue cloud would be much more heavily populated. C) The blue cloud would be much less populated. D) Both A and B
Power: The nichrome heating element in an electric drier operates on 240 V and generates heat at the rate of 2.0 kW. The heating element shorts out and, in repairing it, the repairman shortens the nichrome wire by 10%. (Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element?
A. The power is still 2.0 kW. B. The power increases to 2.2 kW. C. The power decreases to 1.8 kW. D. None of the given answers is correct.