By how much, in meters, does a 8.2-m aluminum rod expand when it is heated from 20°C to 99°C?
Two hockey pucks of equal mass approach each other head-on with equal speeds of 8.3 m/s. They collide and one puck leaves the collision with a speed of 6.1 m/s. What is the speed of the other puck after the collision?
A 51-kg penguin is perched atop a cliff, 58 m above the ocean. Find the penguin's gravitational potential energy with respect to sea level.