A parachutist of mass 50.0 kg jumps out of an airplane at a height of 800 m. The parachute deploys, and she lands on the ground with a speed of 5.0 m/s. How much energy was lost to air friction during this jump?
a. 49,400 J
c. 391,000 J
b. 98,700 J
d. 489,000 J
C
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Work Done by a Gas: An expansion process on an ideal diatomic ideal gas has a linear path between the initial and final coordinates on a pV diagram. The coordinates of the initial state are: the pressure is 300 kPa, the volume is 0.0700 m3, and the temperature is 390 K. The final pressure is 130 kPa and the final temperature is 310 K. How much work is done by the gas during this process? (R = 8.31 J/mol ? K)
A. 13,000 J B. 6300 J C. 9400 J D. 16,000 J E. 19,000 J
Compared with the mass of an apple on Earth, the mass of the same apple on the Moon is
A) less. B) more. C) the same.
An AC generator consists of 6 turns of wire. Each turn has an area of 0.040 m2 . The loop rotates in a uniform field (B = 0.20 T) at a constant frequency of 50 Hz. What is the maximum induced emf?
a. 13 V b. 2.4 V c. 3.0 V d. 15 V e. 4.8 V
The number of cycles of a wave passing a point per unit time is the wave's
a. speed b. frequency c. wavelength d. amplitude e. loudness