The best site for placing a ground-based optical telescope is ________.
A. a mountaintop
B. in a location that has few sunny days throughout the year
C. in an urban setting
D. a valley
Answer: A
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A flat plate solar collector heats water by means of a 1 in diameter copper tube. At a certain time the inside surface of the copper tube is at 115ºF and the water enters at 50ºF. The water should be leaving the collector at 95ºF with a flow rate of 140 ft^3/hr. Determine (a) the Reynolds number and (b) the length of tube needed.
What will be an ideal response?
Thermodynamic Devices: An ideal Carnot engine is operated as a heat pump to heat a room in the winter. The heat pump delivers heat to the room at the rate of 47 kJ per second and maintains the room at a temperature of 293 K when the outside temperature is 237 K. The power requirement to run the heat pump under these operating conditions is closest to
A. 9000 W. B. 7100 W. C. 20,000 W. D. 15,000 W. E. 11,000 W.
Doppler radar is replacing conventional radar in weather forecasting because
a. it can measure wind speeds. b. Doppler radar is widely used in police cars. c. it is cheaper. d. government agencies are required to use the latest equipment.
Assume that a uniform magnetic field is directed into this page. If a proton is released with an initial velocity directed from the bottom edge to the top edge of the page, which of the following describes the direction of the resultant force acting on the proton?
a. into the page c. to the right b. to the left d. out of the page