Which of the following is an example of convection?

the rays of the Sun warming the earth

a hot oven warming the air around it

a hot object transferring heat to a cooler one

hot air rising and cooler air falling

If the mass of both weights is 150 gm, the first mass is located 25° north of east, the second mass is located 25° south of east, and the transducer sensitivity is 0.

Which type of friction is best described as the force between objects that are moving?

What forms when air masses with different temperatures meet? a. storms. b. thunder. c. fronts. d. currents

What quantity of heat is needed to convert 1 kg of ice at - 13 degrees C to steam at 100 degrees C?

A device that transforms electrical energy to mechanical energy is a

A student is trying to calculate the density of a ball. She already knows the mass, but she needs to determine the volume as well. Which of the following formulas can be used to calculate the volume of the ball?

Is there such a thing as real time weather radar? why not?

Luke and Carrie are driving down a straight section of the interstate at 70 mph in Luke's new convertible. Carrie is drinking a soda in the passenger seat.

A force produces power p by doing work w in a time t. what power will be produced by a force that does six times as much work in half as much time?

A batter hits a baseball with a bat. The bat exerts a force on the ball. Does the ball exert a force on the bat?