1. Molly carries a 30 kg bag of feed up a ramp which has a base of 4 m and a height of 2 meters. How much work was done to the bag?
a. 162 Nm
b. 588 Nm
c. 1315 Nm
d. 1583 Nm

An object dropped from cliff falls with a constant acceleration of 10 metre per second square find its speed of two seconds after it was dropped

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.

If you let go of the notebook after lifting it, will it move? how?