An ideal heat pump is being considered for use in heating an environment with a temperature of 22.4°c. what is the cold reservoir temperature (in degrees c) if the pump is to have a coefficient of performance of 11.7?

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.

Scientist have use computer models to create a series of maps that show how susceptible coastal cities in island countries are to the sea rising at different levels.the map shows that a 1 meter rise would swap cities all along the us eastern seaboard. a 6-meter sea level rise with sub merge a large part of florida. thermal expansion has already raise the oceans 10 to 20 centimeters the most likely cause,directly and indirectly, for such a rise in sea level is

An element becomes a positively charged ion when itloses protons.loses electrons.gains electrons.gains neutrons.