the air in the room has a mass of 50 kg and a specific heat of 1000j. What is the change in thermal energy of the air when it warms from 20 degrees celsius to 30 degrees celsius?

You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?