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A person pushes a 23.2-kg shopping cart at a constant velocity for a distance of 24.6 m on a flat horizontal surface. She pushes in a direction 23.0° below the horizontal. A 44.6- N frictional force opposes the motion of the cart. (a) What is the magnitude of the force that the shopper exerts? Determine the work done by (b) the pushing force, (c) the frictional force, and (d) the gravitational force. (a) Number i (b) Number i (c) Number i (d) Number i Units Units Units Units <> <> <> <>
A 1470-kg car is being driven up a 9.86 ° hill. The frictional force is directed opposite to the motion of the car and has a magnitude of 508 N. A force F is applied to the car by the road and propels the car forward. In addition to these two forces, two other forces act on the car: its weight W and the normal force FN directed perpendicular to the road surface. The length of the road up the hill is 281 m. What should be the magnitude of F, so that the net work done by all the forces acting on the car is 170 kJ? Number i Units î
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.54 x 105 N. In being launched from rest it moves through a distance of 64.6 m and has a kinetic energy of 5.36 x 107 Jat lift-off. What is the work done on the jet by the catapult? Number Units ✪