A4.4 kg object is being pushed along a surface, causing it to accelerate at a rate of 1.5 m/s2 . th e coeffi cient of kinetic friction is 0.25. what is the magnitude of the horizontal force being applied to push the object?

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

What is the single most important equation in all of physics?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".