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A uniform .20-kN board of length L has two objects hanging from it : 300N at exactly L/3 from one end, and 400 N at exactly 3L/4 from the same end. What torques are being exerted on the board?
A double speed trap is set up on a freeway. One police cruiser is hidden behind a billboard, and another is some distance away under a bridge. As a sedan passes by the first cruiser, its speed is measured to be 99.7 mph.
A 4.7-g bullet leaves the muzzle of a rifle with a speed of 334 m/s. What force (assumed constant) is exerted on the bullet
What is the magnification of an astronomical telescope whose objective lens has a focal length of 74 cm and whose eyepiece has a focal length of 2.9 cm
If the radius of the Earth is 6380km and its mass is 5.98X10^24 , determine the actual average density of the Earth
A sheet of plywood 1.39 cm thick is used to make a cabinet door 55.5 cm wide by 69.5 cm tall, what is the moment of inertia of the door about the hinges
115 g of glass beads, originally at a temperature of 75.0 oC, are added to 85.0 g of ethyl alcohol which is at a temperature of -50.0 oC. find the temperature of the mixture when thermal equilibrium is reached
q1. a proton moves perpendicular to a uniform magnetic field at a speed of 1.80 x 107 ms and experiences an
a 25 kg child on a 2m long swing is released from rest when the ropes of the swing make an angle of 25 degrees with the vertical, neglecting friction, find the childs speed at the lowest position
If you are going to do this, please show your work!! DO NOT just give an answer. A woman lifts a 2.00-kg weight held in her hand. find how much work does she do
Two 1.6 kg bodies, A and B, collide. The velocities before the collision are vector vA = (18i hat + 35j hat) m/s and vector vB = (-10i hat + 10.0j hat) m/s.
If a capacitance meter applies a charge of 3.0 V across two plates and reads a capacitance of 30 pF, what is the charge on the plates
A bat hits a moving baseball. If the bat delivers a net eastward impulse of 0.8 N-s and the ball starts with an initial horizontal velocity of 5.0 m/s to the west, what is the mass of the ball
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