I drop a 60-g golf ball from 2.0 m high. It rebounds to 1.3 m. How much energy is lost?
a. 0.29 J
c. 0.88 J
b. 0.41 J
d. 1.0 J
B
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Which emits radiation of the highest frequency?
A) a red-hot star B) the Sun C) a blue-hot star D) all the same
Moving electric charges will interact with
A) an electric field. B) a magnetic field. C) both of these D) none of the above
Gravitational force is greater for a satellite in elliptical orbit when it is at the
A) apogee (farthest point). B) perigee (closest point). C) zenith. D) same acceleration at all of the above places.
Water-90% triethylene glycol is to be used to dry air. If the mixture is added to an air stream at 25ºC, determine the amount of mixture required per kilogram of dry air to dehumidify the air if the air stream is at 35ºC and 90% relative humidity. Assume that 25% excess mixture is required than theoretically predicted. Also determine the outlet air temperature and the relative humidity. Assume that the specific heat of triethylene glycol is 2.4 kJ/kg?K.
What will be an ideal response?