You fall, while skiing, and one ski (of weight W) loosens and slides down an icy slope (assume no friction), which makes an angle ? with the horizontal. The force that pushes it down along the hill is
A) W.
B) W cos ?.
C) zero; it moves with constant velocity.
D) W sin ?.
E) W tan ?.
D
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A parallel plate capacitor is connected to a battery and charged to voltage V. Leah says that the charge on the plates will decrease if the distance between the plates is increased while they are still connected to the battery. Gertie says that the charge will remain the same. Which one, if either, is correct, and why?
A. Gertie, because the maximum voltage is determined by the battery. B. Gertie, because the capacitance of the capacitor does not change. C. Leah, because the capacitance decreases when the plate separation is increased. D. Leah, because the capacitance increases when the plate separation is increased. E. Neither, because the charge increases when the plate separation is increased.
Consider a very small hole in the bottom of a tank 20.0 cm in diameter filled with water to a height of 50.0 cm. Find the speed at which the water exits the tank through the hole
A) 3.13 m/s B) 9.80 m/s C) 31.8 m/s D) 34.9 m/s
In which type or types of radioactive decay does the mass number of the parent nucleus not change?
A) electron capture only B) beta decay only C) alpha decay only D) beta decay and electron capture
A pipe of length L will support the lowest fundamental frequency in which of these cases?
1.if it were closed at both ends 2.if it were open at both ends 3.if it were open at one end and closed at the other 4.All of these cases support the same fundamental frequency because the pipe is the same length for each case.