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A long, thin rod (length = 4 m) lies along the x axis, withits midpoint at the origin. In a vacuum, a +8 microC pointcharge is fixed to one end of the rod, and a -8 micro C pointcharge is fixed to the other end. Everywhere in the x, yplane there is a constant external electric field (magnitude= 5.0 x103) that is perpendicular to the rod. Withrespect to the z axis, find the magnitude of the net torque applied to the rod.
A meterstick of negligible mass has a 0.15kg mass at its 38cm mark and a 0.35kg mass at the 78cm mark. Where should the fulcrum be so the meterstick is balanced
Two charges are held 0.5 m apart and exert a force of 32 N on one another. what is the force they exert on one another
Dan is gliding on his skateboard at 4.00m/s . He suddenly jumps backward off the skateboard, kicking the skateboard forward at 6.00m/s, How fast is Dan going as his feet hit the ground
A spaceship is moving around the Earth in a 500- x 1000km orbit. At apogee, a retrorocket is fired in a direction exactly opposite to the spaceship's velocity vector. How much time elapsed between retrofire and impact
What did Newton discover about gravity? 1. All objects near the Earth free fall with the same acceleration. 2. Any force on a planet would be directed along its path. 3. Gravity only happens on Earth.
What's the advantage of launching space vehicles from high flying aircraft in place of from the ground.
Suppose two parallel-plate capacitors have the same charge q, but the area of capacitor 1 is A and the area of capacitor 2 is 2A. what is the voltage across capacitor 2?
A child slides across a floor in a pair of rubber-soled shoes. The friction force acting on each foot is 20 N, what is the horizontal distance traveled by the sheared face of the sole
A slender rod with a length of 0.300m rotates with an angular speed of 8.80rad/s about an axis through one end and perpendicular to the rod. What is the induced emf in the rod
A girl is standing at the edge of a cliff 145 m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward with a speed of 6.79 m/s. How long does it take the rock to hit the ground
A 65-kg person wants to get to the top of a 2 m high ledge by swinging up to the top by running and grabbing a suspended rope suspended 5m above the ground by a tree.
Two thin rectangular sheets (0.25 m 0.51 m) are identical. In the first sheet the axis of rotation lies along the 0.25-m side, How long does it take for the second sheet
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