Q. A toy plane is flying in a horizontal circle by being attached to a 0.78 meter string. The plane has the mass of 117.7 grams and makes five circular revolutions in 3.5 seconds. Find the tension force acting upon the plane.
Q. A 69N box of clothes is pulled 8.9 m up a 30° ramp by a force of 100 N that points along the ramp. If the coefficient of kinetic friction between the box and ramp is 0.22, compute the change in the box's kinetic energy.