How do reflection and refraction of waves affect communication?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

What opposes motion between surfaces that are touching

Calculate the average distances the car and the washer traveled from the top of the track. record the averages and your qualitative observations in table c of your student guide. record what happened to the washer after the car hit the textbook. explain whether the washer did the same thing every time. what is the average distance the car traveled? cm what is the average distance the washer traveled? cm