A sled of mass 70 kg starts from rest and slides down a 10° incline 80 m long. It then travels for 20 m horizontally before starting back up an 8° incline. It travels 80 m along this incline before coming to rest. What is the magnitude of the net work done on the sled by friction?
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- A 51.6 kg sled coasts down a hill, starting from rest. The hill is inclined at an angle of 17.4 degrees with respect to the horizontal and has a height of 17.5 m. The coefficient of kinetic friction between the sled's blades and the hill is ??μs = 0.11. What is the work done on the sled (in Joules) by the normal force?Spiderman, whose mass is 78.0 kg, is dangling on the free end of a 12.4-m-long rope, the other end of which is fixed to a tree limb above. By repeatedly bending at the waist, he is able to get the rope in motion, eventually getting it to swing enough that he can reach a ledge when the rope makes a 0 = 59.4° angle with the vertical. How much work was done by the gravitational force on Spiderman in this maneuver? kJA 1.6 kg book is lying on a 0.79 m -high table. You pick it up and place it on a bookshelf 2.0 m above the floor. During this process, how much work does gravity do on the book?
- Early one October, you go to a pumpkin patch to select your Halloween pumpkin. You lift the 3.0 kg pumpkin to a height of 1.3 m , then carry it 50.0 m (on level ground) to the check-out stand. Calculate the work you do on the pumpkin as you lift it from the ground. How much work do you do on the pumpkin as you carry it from the field?A spring and block are in the arrangement of the figure. When the block is pulled out to x = +5.0 cm, we must apply a force of magnitude 370 N to hold it there. We pull the block to x = 14.0 cm and then release it. How much work does the spring do on the block when the block moves from x₁ = +5.0 cm to (a) x = +4.0 cm, (b) x = -4.0 cm, (c) x= -5.0 cm, and (d) x = -10.0 cm? (a) Number i (b) Number i (c) Number i (d) Number i x=0 F = 0 00000000 x positive F, negative F moon Units Units Units (a) Units (b) d Block attached to spring x negative F, positive x x xA person pulls a 20 kg heavy box horizontally, which slides at a constant speed. The person makes a force of 60 N in the first 6.88 m. Then she starts to get tired. The force it exerts then begins to decrease linearly until it extinguishes in the next 6.88 m. The moment the person's strength runs out, the box no longer moves. How much work did this person do on the box? What is the starting speed of the box?
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