A constant force of 100 N, which makes an angle of 37° with the horizontal plane, is applied to a stationary object in the horizontal plane, causing the object to be displaced by 10 m. How many J is the work done by the force? A) 798,6 B) 400,4 C) 254,8 D) 601,8 E) 0

5 mc

Problem 9: A 3 kg block is pushed 3 m up a 30° incline by a 50 N force aligned parallel to the ramp. The coefficient of kinetic friction between the ramp and the block is 0.2. a) Calculate the work done by gravity. b) Calculate the work done by the applied force. c) Calculate the work done by the normal force. d) Calculate the work done by the friction force. e) Calculate the net work done on the block. f) Find the speed of the block after traveling this distance. Assume it started at rest. 50 N 30° 3 kg Problem 10: A small child pulls a 5 kg ducky toy 2.5 m across an icy (frictionless) level surface using a rope attached to the toy at an angle of 15° above horizontal. The child uses 20 N of force to pull the ducky. Using the work- energy theorem, determine the speed of the duck after traveling this distance. 20 N 5 kg OO 15° Problem 11: The atwood machine shown is released from rest. Using the work-energy theorem, find the speed of the 10 kg mass after it has fallen a distance of 1…

Example 74 Calculating Total Work Done from a Graph A force acting on a particle varies with x, as shown in Figure 7.8. Calculate the work done by the force as the parti cle moves from x- 0 to x- 6.0 m. F(N) Solution The work done by the force is equal to the area under the curve from xA -0 to xe - 6.0 m This area is equal to the area of the rectangular section from 0 to 8 (m)