In the form of Millikan's experiment, an oil drop was observed to fall with a const
velocity of 2.5 x 10*ms in the absence of an electric field. When a p. d of 1000V
applied between the plates 10mm apart, the drop remained stationary betwe
them. If the density of oil is 9 x 10²kgm", density of air is 1.2kgm and viscosity
air is 1.8 × 10-Nsm-. Calculate the radius of the oil drop and the number of elec
charges it carries.

You have been called to testify as an expert witness in a trial involving a head-on collision. car a weighs 1515 lb and was traveling eastward. car b weighs 1125 lb and was traveling westward at 44.0 mph. the cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. you have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . how fast (in miles per hour) was car a traveling just before the collision? (this problem uses english units because they would be used in a u.s. legal proceeding.)

In a vernier instrument the main scale is in 1/2 mm divisions .vernier is made by redividing 19 such divisions into 20 equal parts. calculate the least count of the instrument.

If the speed of a particle triples ,by what factor does its kinetic energy increase?