Which two objects have stored energy?

1. a ball rolling on the ground

2. a small rock sitting on top of a big rock

3. a stretched rubber band

4. a stone lying on the ground

As part of his meal, a workman has a cup containing a hot drink. In order to keep the drink hot whilst he eats the rest of his meal, he covers the cup, as shown in the figure. Which sources of energy loss does this action reduce? Tick two boxes.

Friends Burt and Ernie stand at opposite ends of a uniform log that is floating in a lake. The log is 3.0 m long and has mass 20.0 kg. Burt has mass 30.0 kg; Ernie has mass 40.0 kg.

What clues indicate that the earth has changed its postion in its orbit?

A homeowner is considering these heating systems for heating his house: Electric resistance heating with $0.12/kWh and 1 kWh = 3600 kJ, gas heating with $1.34/therm and 1 therm = 105,500 kJ, and oil heating with $2.

What does Pangaea mean?

How much more ground motion is produced by an earthquake of magnitude 7.0 than by an earthquake of magnitude 4.0?

What evidence is there of life in a mini habitat?

A hole is drilled to the center of the earth and a ball is dropped into it. When the ball is at the earth's center, compared with their respective values at the earth's surface,

What is the development of static?

Methane gas absorbs red light, and methane clouds reflect blue light, giving Uranus and Neptune their distinctive blue colors. Why do Uranus and Neptune have methane clouds, but Jupiter and Saturn do not