Use the exact exponential treatment to find how much time, in milliseconds, is required to bring the current through an 81.6 mh inductor in series with a 15.7ω resistor to 78% of its final value, starting from zero.

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?