When hot and cold air meet, the hot air rises to the top. Which process causes the hot air to rise?

A.

radiation

B.

conduction

C.

convection

D.

induction

Which statements about electric field lines are correct? Check all that apply.

There is no sound in the vacuum of space. Why? Sound must travel through something that vibrates. There is no energy in space. There is no air to vibrate the human eardrum. Space is too full of light energy.

Pure substances can be classified as blank or compounds

A young hockey player stands at rest on the ice holding a 1.3-kg helmet. The player tosses the helmet directly in front of him with a speed of 6.0 m/s and recoils with a speed of 0.25 m/s.

Your friend, who is age 15 and has a resting heart rate of 70, wishes to start a jogging program. What would you suggest as a proper starting target heart rate? 138 115 178 155

Drivers are able to see objects ahead of them because light travels through windshields.

How are trade winds affected by the coriolis effect

When a raw egg gets heated into an edible egg is this considered a physical or chemical change?

Starting at its rightmost position, it takes 2 seconds for the pendulum of a grandfather clock to swing a horizontal distance of 18 inches from right to left and 2 seconds for the pendulum to swing back from left to right.

A question about a moral issue is answered by examining facts rather than opinions. is generally considered a scientific question. cannot be answered with scientific methods. cannot be debated through discussion.