Movements and Interactions: i got the answer as 1.5 kW is it right? question: if an electric drill transfers 180kj of energy over 2 mins to its motor, what is the power rating? i done : P(w) = E(j) / T(s) = 180 x 10^3 / 2 x 60 = 1500w = 1.5kW is that correct or have i done a mistake?

An object of dimensions 50 cm x 40 cm x 0.20 cm has a mass 60g. find its density in g/cm3 and kg/ m3

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)