A box is pulled up an inclined plane by a force parallel to the plane. A force performing no work during the motion is A. Applied force B. Gravitational force C. Friction force D. Normal force
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- 1-An object of mass m=2kg which is initially at rest is pushed upward by a horizontal force F= soN along the incline surface as shown in the figure. The coefficient of friction between the mass and the surface is =O.5. The block traveled a distance =10m along the incline under the action of F. Determine a) Work done by the horizontal force b) Work done by the friction force c) Work done by the gravitational force d) Work done by the normal force e The acceleration of the mass f The velocity of the block after it traveled the distance d (g= 10 m/s°, = 37 ° COS37° = 0.8, sin37° = 0.6)15. A 10-kg box sits at rest on a rough portion of an inclined plane whose surface is 10 m long (hypotenuse). a. What is the minimum static coefficient of friction at the spot where the box is positioned if the total height of the inclined plane is 6 m? b. If the box slides through a smooth portion of the surface that is 3 meters long, calculate the work done on the box assuming that the kinetic coefficient of friction at the smooth portion is 0.1.
- Which one of the following forces is doing work? a) the normal force acting on you as you move upward in an elevator. b) the tension in the string of a simple swinging pendulum. c) the frictional force acting on a car as it rounds a bend without slipping. d) your weight as you slide along a horizontal surface. Explain why.A small pail is filled with sand with a mass of 675 grams that hangs in a makeshift crane at the end of a rope. The rope passes through a frictionless pulley at the makeshift crane. If you pull horizontally on the end of the rope to raise the small pail at a distance of 4 meters. a) Compute the work you do to pull it up. b) Compute the work done by the gravity on the small pail.Suppose the coefficient of kinetic friction between a loaded 47.0 kg Eskimo pulled a sled and snow is 0,18. The force by the Eskimo is 150N and is acted at an angle of 25 degrees with the horizontal. The Eskimo pulled the sled to move by a distance of 9.4m a) draw a free body diagram for the sled b) find the work done by each of the forces you drew c) find the net work
- Choose the correct statement a A displacement must cause work b A displacement must happen simultaneously to work C Work must cause a displacement d Work is not dependent on displacementA 81-kg skydiver has a speed of 71 m/s at an altitude of 912 m above the ground. a. Determine the kinetic energy possessed by the skydiver.b. Determine the potential energy possessed by the skydiver.c. Determine the total mechanical energy possessed by the skydiver.An 8 kg sled is at rest on a horizontal road. The coefficient of kinetic friction between the sled and the road is 0.4. The sled is pulled a distance of 3 m by a force of 40 N applied to the sled at an angle of 30 degree.a) Find the work done by the applied force.b) Find the work done by friction. c) Find the change in kinetic energy of the sled.d) Find the speed of the sled after it has traveled 3 m.
- 1- An object is constrained to move inside a vertical ring near the surface of Earth as shown in the picture. Answer the following questions: What are the forces acting on the object b) is the work done by each force zero, positive or negativel SWhich of the statements below is true when you catch a baseball that comes at you horizontally? a. The work that you do is positive. b. The work that you do is negative. c. Work is not a vector and cannot be referred to as positive or negative. d. Work is a scalar product expressed in terms of magnitudes, so it is never negative. e. Work is expressed in terms of kinetic energy, which must be positive.1. A 2kg object is hanging from a rope that makes an angle of 30 degrees with the horizontal. The object is pulled by a force of 10N at an angle of 60 degrees with the horizontal. Using the laws of motion and vector analysis, determine the acceleration of the object, the tension in the rope, and the work done by the force during a displacement of 2m.