A lightweight plastic rod has a mass of kg attached to one end and mass of kg attached to the othe end. The rod has a length of 0.80 m. How far from the 1.0 kg mass should a string be attached to balance the rod?

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

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".