A car takes 9 m to stop after the driver applies the brakes. The brakes exert a force of 2000 N.

Calculate how much work is done by this force.

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)

Which form of cell division creates the sperm and egg, resulting in half of the chromosomes as the other cells?