Transformers: If the primary coil of a transformer contains more loops than the secondary coil then it is a
A. step-up transformer.
B. step-down transformer.
Answer: B
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Airplane lift is achieved when air pressure on the bottom of its wings is
A) greater than pressure on top. B) less than pressure on top. C) the same as pressure on top.
When we consider a thin horizontal layer of the atmosphere, of thickness dy, of area A, with pressure P on the bottom, with an average mass m per molecule, and nV molecules per unit volume, the magnitude of the difference of the pressure at the top and bottom of the layer is given by dP =
a. mgdy. b. mgnVdy. c. mgAdy. d. mgnVAdy. e. mgnVAPdy.
A boat is floating in a small pond. The boat then sinks resting on the bottom, but the pond is so shallow that part of the boat is not submerged. What happens to the level of the pond?
A. It increases. B. It decreases. C. It stays the same. D. In some cases it would decrease, in others it would stay the same. E. In some cases it would increase, in others it would stay the same.
The lunar regolith is constantly eroded by ________
Fill in the blank(s) with correct word