Convection can occur in which two substances?

a) wood and air

b) ice and wood

c) water and ice

d) air and water

What happens when multiple forces act on an object?

The density of paper is 1.20 g/cm3. what is the mass of the paper in a notebook that is 76 mm thick, 215.9 mm wide, and 279.4mm long? express your answer in significant digits.

A ball is rolled along the inside of a partial hoop lying flat on a table. which path will the ball follow when it gets to the end of the hoop?

A trucker drove from San Fransisco to Washington, DC (2865 mi) The entire trip required 77 h and 30 min. if 16h and 30 min of that time was spent sleeping and 3h 40 min was used for meals and refueling, what was the average speed while on the road?

What is the difference in charges on a balloon rubbed in your hair and a glass rod rubbed with silk?

How are magnetic poles and electrical charges similar? A. Their same forces repel each other, and their opposite forces attract each other. B. Their same forces attract each other, and their opposite forces repel each other. C.

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.

When energy is transformed, the amount of usable energy?

If an object weighs 39.2 n on earth, what is its mass

What happens when pressure is applied to a solid.