A system absorbs 98 joules of heat from the environment. After doing work, the system’s internal energy is 51 joules. How much energy was used by the system to do useful work?

Which levels of government establish and implement educational requirements for minors

Afrequency generator sends a 550 hz sound wave through both water and ice. what is the difference in wavelength between the wave produced in ice and the wave produced in water?

Aplayer uses a hockey stick to push a puck at a constant velocity across the ice. the weight of the puck is 170 n. the coefficient of friction is 0.0600. with what force must the player push the puck so that his force just equals the frictional force? 28.3 n 0.999 n 0.102 n 0.0104 n