True or false: To have constructive interference of two waves meeting, the crest of each wave must be on the same side of the equilibrium position

Experiment scenario 2: a biology student wants to conduct a study of how the amount of food affects the weight gain for mice. i have set up four cages with a mouse in each cage. fill in the boxes that would allow the biology student to complete the study correctly

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?