Water flows over a waterfall that is 20 m high at the rate of 4.0 × 104 kg/s. If this water powers an electric generator with a 40% efficiency, how many watts of electric power can be supplied?
What will be an ideal response?
3.1 MW
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Which has the larger light-gathering power?
a. a telescope of 5 cm diameter and focal length of 50 cm b. a telescope of 6 cm diameter and focal length of 100 cm c. a telescope of 2 cm diameter and focal length of 100 cm d. a telescope of 3 cm diameter and focal length of 75 cm e. both b and c since they have the same focal length.
What is the approximate wavelength of red light?
A. 7 cm B. 5 m C. 400 nm D. 700 nm
How much energy would be released if 2.0 kg of material was lost during a reaction?
A) 1.8 × 1017 J B) 1.5 × 1016 J C) 2.4 × 10-17 J D) 6.0 × 108 J E) 4.7 × 10-8 J
A navigational beacon in deep space broadcasts at a radio frequency of 50 MHz. A spaceship approaches the beacon with a relative velocity of 0.40c. The spaceship passes the beacon and departs from it with a DIFFERENT relative velocity
The beacon signal is now detected at a frequency of 40 MHz. What is the new velocity of the spaceship relative to the beacon? A) 0.24c B) 0.28c C) 0.26c D) 0.20c E) 0.22c