Asphere 5 cm in diameter has a small scratch on its surface. when the scratch is viewed through the glass from a position directly opposite, where does the scratch appear and what is its magnification? assume n = 1.5 for the glass.

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?