18. A physics instructor is in a dryer traveling at o 800 rad/s. a) How many rev

Question

18. A physics instructor is in a dryer traveling at o 800 rad/s. a) How many revolutions per minute is he making? b) What is the centripetal force on the instructor? c) If he stops at At 27 seconds, how many degrees has he traveled? 19. Galileo falls out of his chair onto the floor, which is a height of .5 m. His mass is 91 kg. a) Using conservation of energy, calculate his final velocity at the floor level. b) If he only has kinetic energy, calculate the power generated if he fell to the floor in .00 2 seconds.

Explanation / Answer

19) KE = PE

0.5mv^2 = mgh

v = sqrt(2gH) = sqrt(2*9.8*0.5)

= 3.13 m/s

b) Power = W / t

= 0.5*91*3.13^2 / 0.002

= 222950 W

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