Abicyclist increases her speed from 4.0 m/s to 6.0 m/s. the combined mass of the bicyclist and the bicycle is 55 kg. how much work did the bicyclist do in increasing her speed? a. 11 j b. 28 j c. 55 j d. 550 j

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.