Avibrating system consists of a mass of 7 keg, a spring of stiffness 50 n/cm and damper of damping co-efftcient 0 36 n cm-1 sec. find the damping factor, the logarithmic decrement and the ratio of any two consecutive amplitudes,

Which subatomic particle has a negative charge

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".

How can waves travel through ground?