How much heat energy is required to raise the temperature of 20 kilograms of water from 0°c to 35°c?

Galileo was the first to notice that the moon has craters, valleys, and mountains. how might this have changed people's perception of the moon at the time?

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?