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Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree trunk at an angle of 27.0° above the horizontal. One child, with a mass of 41.0 kg, is hanging 1.25 m along the branch from the tree trunk. The other child, with a mass of 26.0 kg, is hanging 2.25 m from the tree trunk. What is the magnitude of the net torque exerted on the branch by the children? Assume that the axis is located where the branch joins the tree trunk and is perpendicular to the plane formed by the branch and the trunk.
A proton is moving through a magnetic field of strength 2 kT with a speed of 2.5*10^8 m/s, what is the angle between the proton's velocity and the direction of the field
You exert a force as shown in the diagram to push a large crate of books (about 1 m high, m = 45.0 kg) across a rough floor at constant speed v = 0.650 m/s. Find the rate at which work is done by you
A ball is thrown horizontally from the top a of building 43.7 m high. The ball strikes the ground at a point 114 m from the base of the building. What would the initial velocity be
q1. a wave on a slinky has a frequency of 1.69 hz. it takes 4.1 s to travel the length of the slinky 0.29 m. what is
Consider the collision between two hockey pucks in the figure below. They do not stick together. Their speeds before the collision are v1i = 27 m/s and v2i = 14 m/s. What is the final velocity of the other puck
A metal wire 1.3mm in diameter and 1.8m long hangs vertically with a 5.4-kg object suspended from it. what is the value of the Young's modulus for the metal
A 3000 kg truck is heading east at 80 mph. A 1000 kg car is heading north at 40 mph. They collide and stick togther. What is the velocity and direction of the car/truck
What is the net charge inside the sphere.
A wire 28.0 cm long lies along the z-axis and carries a current of 8.50 A in the +z-direction. find the magnitude of the net magnetic force on the wire
Nick is sitting in a swing thet has a rope attached to it. The rope then goes through a pulley attached to a tree above him, Find the contact normal force between Nick and the swing
a girl uses a jump rope made of flexible wire. she holds the ends of the rope in extended hands, What is the amplitude of oscillation of this alternating emf
A 5 kg mass attached to a horizontal spring is pulled from its equilibrium position by 3 m and let go. what is the maximum velocity of the mass
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