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Q1. A 52.0 kg ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.0 turns each second. The distance from one hand to the other is 1.50 m. Biometric measurements indicate that each hand characteristically makes up about 1.25 % of body weight. What horizontal force should her wrist exert on her hand?
Q2. A horizontal rope is tied to a 46.00 kg box on frictionless ice. What is the tension in the rope if:
The box is at rest?The box moves at a steady v_x = 4.40 m/s?The box v_x = 4.40 m/s and a_x = 6.00 m/s^2?
What is maximal speed v of the elevator
A 1000 {rm kg} wrecking ball hangs from a 15 {rm m}-long cable. The ball is pulled back until cable makes an angle of 25.0^circle with the vertical. By how much has the gravitational potential energy of the ball changed .
A 52.0 skateboarder wants to just make it to the upper edge of a "quarter pipe," a track that is one-quarter of a circle with a radius of 2.90. What speed does he need at the bottom.
Evaluate the electrostatic energy of two opposite charges
Find the flow rate of sludge and thickened sludge, salt concentration, water flow rate and pumping rate of a reservoir.
What are the original charges on each sphere
Analyse average density of the white dwarf
Illustrate the cause of the components accelerating from rest down the conveyor.
A toy car runs off the edge of the table that is 1.6405 m high. The car lands 0.3311 m from the base of the table how long does it take for the car to fall? The acceleration by reason of gravity is 9.80 m/s2.
A ball of mass 1.020 g and positive charge q =45.2 microC is suspended on a string of negligible mass in a uniform electric field. We view that the ball hangs at an angle of theta=15.0 from the vertical. What is the magnitude of the electric field.
Calculate escape velocity for an object started at the surface of the earth, going straight up. Neglect any complications due to the earth turning.
What temperature change would reason a 0.20 % enhance in the volume of a quantity of water that was at first at 20 ^circ {rm C}.
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