A fountain sends a stream of water 20.0 m up into the air. If the base of the stream is 10.0 cm in diameter, what power is required to send the water to this height?
What will be an ideal response?
30.5 kW
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Which of the following would be the same for a person on the Moon rather than on Earth?
a. Maximum jumping height b. Weight c. The amount of time for an object to fall 2 meters from rest d. Mass e. Gravitational acceleration
By operating a reversible heat engine with an ideal gas as the working substance in a Carnot cycle and measuring the ratio Qc/Qh, we can calculate
a. n, the number of moles of the ideal gas. b. the ratio Vc/Vh of the volumes of the ideal gas. c. the ratio Pc/Ph of the pressures of the ideal gas. d. the ratio PcVc/PhVh of the products of volumes and pressures of the ideal gas. e. the value of Avogadro's number.
Ethyl glycol at 90ºC flows at 10 m/s through 2 mm diameter heat exchanger tubes. The tube surface temperature is 30ºC at the entrance and the tube is 60 cm long. Estimate the outlet temperature of the ethyl glycol and the outlet tube surface temperature.
What will be an ideal response?
Consider a converging lens. If the object is inside the focal point, then the image will always be
A) real. B) virtual. C) at the focal point. D) at infinity.