An engine has an ideal efficiency of 37%, and the cold reservoir is 15°C. What is the temperature of the hot reservoir? Convert the efficiency to a decimal before solving. Round the answer to the nearest tenth.

Achemistry student needs of 40ml diethylamine for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of diethylamine is 0.7 . calculate the mass of diethylamine the student should weigh out. round your answer to significant digits.

Which terms describe the purpose of antennas on devices that use radio waves? transmit and receivemodify and amplifyamplify and receivemodify and transmit

Why do atoms emit energy of only specific wavelengths