If light photons are massless then why are they attracted by black holes?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

An automobile steering wheel is shown. what is the ideal mechanical advantage? if the ama is 8, what is the efficiency of the steering wheel?

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter