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A +20 nC point charge is placed on the x axis at x =2.0 m, and a -25 nC point charge is placed on the y axis at y = -3.0 m. What is the direction of the electric field at the origin?
An asteroid is discovered heading straight toward Earth at 13km/s. An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 mins, after which the asteroid is moving at 28 degrees to its original path at a..
Two charges q1 = 1.1 10-8 C and q2 = -4.8q1 are placed 50 cm apart. Find the point along the straight line passing by the two charges at which the electric field is zero, as measured from q1.
What is the tangential acceleration of a bug on the rim of a 7 in. diameter disk if the disk moves from rest to an angular speed of 76 revolutions per minute in 4 s.
Calculate the period T and the tension in the string F as a function of the angle. Compute the moment of inertia of this system for an axis that passes through the combined center of mass and is perpendicular to the plane of the rings.
A bunch of grapes is placed in a spring scale at a supermarket. The grapes oscillate up and down with a period of 0.64s, What is the mass of the grapes
A person's prescription for her new bifocal glasses calls for a refractive power of -0.461 diopters in the distance-vision part, and a power of +1.83 diopters in the close-vision part. Find the near and far points of this person's uncorrected visi..
Illustratr what is the amplitude of the oscillations? What were the (b) position and (c) velocity of the block at t = 0 s?
A skier is gliding along at 3.6 m/s on horizontal, frictionless snow. He suddenly starts down a 10 degree incline. His speed at the bottom is 17 m/s .
A camera has a lens with a focal length of 26.8 cm. how far from the film should the lens be placed
A school yard teeter-totter with a total length of 5.2m and a mass of 36kg is pivoted at its center. A 19 kg child sits on one end of the teeter-totter.
You throw a ball straight up in the air. The instant after leaving your hand, the balls speed is 30 meters per second. Ignoring the effects of air resistance, predict how fast the ball will be traveling 2 seconds later.
A cannon with mass of 2000kg fires a 10kg shell at an angle of 60 degrees above the horizontal. what is the velocity of the cannon ball
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