One mole of nickel (6 x 10²³atoms) has a mass of 59 grams, and its density is 8.9 grams per cubic centimeter so the center-to-center distance between atoms is 2.23 x 10⁻¹⁰ m. You have a long thin bar of nickel, 2.7 m long, with a square cross-section, 0.06 cm on a side.
You hang the rod vertically and attach a 27 kg mass to the bottom, and you observe that the bar becomes 1.38 cm longer. From these measurements, it is possible to determine the stiffness of one interatomic bond in nickel.
What is the spring stiffness of the entire wire, considered as a single macroscopic (large scale), very stiff spring?

A50.0-n box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. you observe that at one instant the box is sliding to the right at and that it stops in 2.25 s with uniform acceleration. what magnitude force does friction exert on this box

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?