A package of mass 7 kg sits at the equator of an airless asteroid of mass 3.0 1020 kg and radius 5.7 105 m. We want to launch the package in such a way that it will never come back, and when it is very far from the asteroid it will be traveling with speed 236 m/s. We have a large and powerful spring whose stiffness is 2.2 105 N/m. How much must we compress the spring?

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?