The element which does not show variable valency a) AI b)Fe c) Cu d) Hg

The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s

What properties of a moving object are used in determining the object's energy of motion

What is the measurement of how fast an object moves relative to a reference point?