Relative Velocity: An airplane with an airspeed of 140 km/h has a heading of 50° west of north in a wind that is blowing toward the east at 25 km/h. What is the groundspeed of the plane?
Fill in the blank(s) with the appropriate word(s).
120 km/h
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One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C, exhaust temperature = 430°C, 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
(a) What is the actual efficiency of this engine? (b) What is the Carnot efficiency of the engine? (c) What is the power output, in hp, of this engine?
Michelson and Morley demonstrated that the speed of light is ________ of the motion of the observer
Fill in the blank(s) with correct word
An object lifted 10 m gains a certain amount of potential energy. If it is lifted 20 m, its gain in potential energy is
A) less. B) the same. C) twice as much. D) four times as much. E) more than four times as much.
A certain pendulum consists of a 1.5-kg mass swinging at the end of a string (length = 2.0 m). At the lowest point in the swing the tension in the string is equal to 20 N. To what maximum height above this lowest point will the mass rise during its oscillation?
a. 77 cm b. 50 cm c. 63 cm d. 36 cm e. 95 cm