The kinetic energy of an object depends upon its- C. speed and mass
Answer:
When glass rod is rubbed with silk clothes, glass quickly loses electrons, and silk takes electrons out of the glass rod
Answer:
(a) 625 ft lb
(b) 468.75 ft lb
Explanation:
Work=Force* Distance
(a)
Force=wl/2 where w is uniformly distributed load of 0.5 lb/ft and l is the length of the rope
Force=0.5*50/2=12.5
Work=12.5*50=625 ft lb
(b)
Assuming that the weight of the rope is concentrated in two places, half is 12.5 feet down and the other half is 37.5 feet down. The center of mass of the top half is 12.5 feet down. The weight of the top half is 12.5
Work=work on top half + work on bottom half
Work on top half=12.5*(0.5*25)=156.25 ft lb
work on bottom half=12.5*(0.5*50)=312.5 ft lb
Total work=156.25+312.5=468.75 ft lb
