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In a skating stunt known as "crack-the-whip," a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 58.0 kg and is 7.80 m from the pivot. He is skating at a speed of 6.40 m/s. Find out the magnitude of the centripetal force that acts on him.
A motorist driving along a straight road at a constant speed of 60 -m/s. At time t=0 she passes a parked motorcycle police officer and begins to accelerate at the constant acceleration.
The nonconservative wind and lift forces take the balloon up, doing +9.70 104 J of work on the balloon in the process. Illustrate at what height above the surface of the earth does the balloon have a speed of 8.90 m/s?
A uniform plank of length 4.3 m and weight 201 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x could a person who weighs 449 N walk on the overhanging part of the p..
A sport utility vehicle (SUV) and a sports car travel around the same horizontal curve. The SUV has a static stability factor of 0.80 and can negotiate the curve at a most speed of 18 m/s without rolling over.
A 1 mL syringe has an inner diameter of 4.0 mm, a needle inner diameter of 0.220 mm, and a plunger pad diameter (where you place your finger) of 1.20cm.
Two particles are fixed to an x axis: particle 1 of charge q1 = +2.1 10-8 C at x = 20 cm and particle 2 of charge q2 = -4.00q1 at x = 70 cm. At what coordinate on the axis is the net electric field produced by particles equal to zero.
The sound travels through the left tube LXM, which has a fixed length. Concurrently, the sound travels through the right tube LYM, length of which can be changed by moving the sliding section
A massless spring with spring constant 22.10 N/m hangs vertically. A body of mass 0.280 kg is attached to its free end and then released. Assume that the spring was unstretched before body was released. How far below the initial position does the ..
A wooden raft has a mass of 92kg. When empty it floats in water (density 1000 kg/m3) with 48 percent of its volume submerged. What mass of sand can be put on the raft without it sinking.
Their motions have equal periods, but the radius of skater A's circle is half that of skater B's circle. Evaluate the ratio of the magnitudes of the forces acting on each skater?
A father (m = 65 kg) and son (m = 38 kg) are standing facing each other on a frozen pond. The son pushes on the father and finds himself moving backward at 3.0 m/s after they have separated. How fast would the father be moving.
An 18.0 g rifle bullet travelling 245 m/s buries itself in a 3.50 kg pendulum hanging on a 3.00 m long string, which makes the pendulum swing upward in an arc. Find out the vertical and horizontal components of the pendulum's displacement.
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