How much power is theoretically available from a mass flow of 1000 kg/s of water that falls a vertical distance of 50 m?
a. 980 kW
c. 4900 W
b. 98 kW
d. 490 kW
D
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During the T-Tauri phase of a protostar, it
A) begins a period of reduced activity. B) expands dramatically. C) may develop very strong winds. D) lies on the main sequence. E) changes its spin direction.
A glider is in a banked curve with a radius of 125 m radius curve at a constant speed of 10 m/s. Its acceleration is __________
Fill in the blank(s) with correct word
If you were to unscrew bulb B from its socket (effectively removing it from the circuit and leaving a gap in its place), bulb A would
A. get brighter. B. become dimmer. C. remain at the same brightness. D. go out.
A battery has some internal resistance. Can the terminal voltage exceed the emf?
1.No. 2.Yes, if the battery is absorbing energy by electrical transmission. 3.Yes, if more than one wire is connected to each terminal. 4.Yes, if the current in the battery is zero. 5.Yes; no special condition is required.