4-An Eskimo pulls a sled loaded with salmon. The total mass of the sled and salmon is 50.0 kg, and the Eskimo exerts a force of magnitude 120 N on the sled by pulling on the rope. How much work does he do on the sled if θ=30° and he pulls the sled 5.00 m?
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4-An Eskimo pulls a sled loaded with salmon. The total mass of the sled and salmon is 50.0 kg, and the Eskimo exerts a force of magnitude 120 N on the sled by pulling on the rope.
How much work does he do on the sled if θ=30° and he pulls the sled 5.00 m?
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- 94. A 4.7 kg block is pushed 3.1 m up a vertical wall with constant speed by a constant force of magnitude Fapplied at an angle 8=35° with the horizontal, as shown in the Figure. If the coefficient of kinetic friction between block and wall is 0.23, determine a) The work done by F, b) the work done by the force of gravity, c) the work done by the normal force between block and wall. d) By how much does the gravitational potential energy increase during the block's motion? F11. A person pushes a m = 2.60 kg carton a distance d = 4.20 m along the floor by a constant force of magnitude F = 16.0 N directed at an angle 0 = 30.0° below the horizontal as shown in the figure. Assume the floor is frictionless. (a) Determine the work done on the carton by the applied force (the force on the carton exerted by the person). (b) Determine the work done on the carton by the normal force exerted by the floor. (c)Determine the work done on the carton by the gravitational force. (d)Determine the work done by the net force on the carton. m
- 22. An ocean diver swims upwards against the drag force exerted by the water. This force varies in magnitude by depth (d) and is given by F(d)=√d, where y=100 N/m ¹/2. If the diver ascends from a depth of d=10m to the surface (d=0), what is the work done by this drag force? Why is this work negative?3. Suppose you have an object attached to a bizarre spring, initially located at x = 0, the equilibrium point of the force of the spring on the object is given by F₁ = kx, S where k is a spring constant. (a) You displace the object from x = 0 to ₁ > 0, holding the object steady at the beginning and end. What is the work done by the spring? What is the work done by you? (b) You let go of the spring and observe the object move from location. x₁ to x2. Is x2 less than or greater than ₁? (c) What is the kinetic energy of the object at x2? (d) Is this bizarre spring realistic? Explain.
- 2. A cart is pulled a distance D on a flat, horizontal surface by a constant force F that actsat an angle θ with the horizontal direction. The other forces on the object during thistime are gravity (Fw), normal forces (FN1) and (FN2), and rolling frictions Fr1 and Fr2,as shown below. What is the work done by each force?14. A coin slides over a frictionless plane and across an y coordinate system from the origin to a point with ry coordinates (3.0 m, 4.0 m) while a constant force acts on it. The force has magnitude 2.0N and is directed at a counterclockwise angle of 100 from the positive direction of the r axis. How much work is done by the force on the coin during the displacement?3
- 10. A force is applied along the x-direction on a 5.00 kg object. The force varies along its path as shown in the graph. It lasts for 0.50 minute. Find (a) the net work done by the force on the object and (b) the average power the force delivered during that time. (N)칩 (u)x 10. -5 -105. A person pulls an object of mass 40 kg as far as 20 m above a flat floor at a constant speed. The force used is directed 370 upwards horizontally. The coefficient of kinetic friction of the object with the floor is 0.20. Determine the work by the person, the work by the frictional force, and the total work on the object.1. A jeep with mass of 2000 kg is going 18 m/s at the bottom of a hill that is 50.0m high. When it reaches the top, it is travelling at 10m/s. (a) what is the total work done by all forces (the jeep engine, the mud, gravity, etc) as it ascends the hill? (b) What is the minimum work required by engine of the jeep if only the engine and gravity are doing work (if there is na friction, forces from mud, etc)?