4. A string is wrapped around a cylinder of mass mand radius R. The string is pulled vertically upwards to
prevent the centre of mass from falling as the cylinder
unwinds the string. Find:
(a) The tension in the string
(b) The work done on the cylinder when it acquires
an angular velocity
(c) The length of the string unwound in the time the
angular speed reaches W​

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?

Why does lightning travel from clouds to the ground?