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Three charges, each of magnitude 2 nC, are at separate corners of a square of edge length 6 cm. The two charges at opposite corners are positive, and the other charge is negative. Discover the force exerted with these charges on a fourth charge q = +3 nC at the remaining (upper right) corner. (Suppose the +x axis is directed to the right and the +y axis is directed upward.)
Judy (mass 45.0 kg), standing on slippery ice, catches her leaping dog, Use the conservation of momentum to find the speed of Judy and her dog after the catch
A spring of spring constant k = 8.250 N/m is displaced form equilibrium by a distance of 0.1500 m. If the spring is strected form the displacement of 0.1500 m to a displacement of 0.3500 m, what is the change in spring potential energy between tho..
At rest, the car's horn sounds at a frequency of 455 Hz. The horn is sounded while the car is moving down the street. A bicyclist moving in the same direction with one-third the car's speed hears a frequency of 427 Hz. What is speed of the car.
a 112-cm-long rod is rotating around its center. its mass is 291 g and its angular velocity is 30 rads. suddenly for no
what is the maximum instantaneous power dissipated by a3.0hp pump connected to a 240-Vrms ac power source, what is the maximum current passing through the pump
There are competitions in which pilots fly small planes low over the ground and drop weights, trying to hit a target. A pilot flying low and slow drops a weight ; it takes 2.0 s to hit the ground, during which it traveled a horizontal distance ..
A spacecraft approaching the earth launches an exploration vehicle. After the launch, an observer on earth sees the spacecraft approaching at a speed of 0.45c and the exploration vehicle approaching at a speed of 0.80c. What is the speed of the explo..
At the same moment, one rock is dropped and one is thrown downward with an initial velocity of 21m/s from the top of a 300m building. How much earlier does the thrown rock strike the ground? Neglect air resistance.
If this radiation is directed at a crystal, the first-order maximum in the reflected radiation occurs when the angle of incidence is 2.05o. What is the spacing between reflecting planes in the crystal
A meter stick is rotated about the end labeled 0.00 cm, so that the other end of the stick moves through an arc length of 6.87 cm. During what arc length s does the 25.0-cm mark on the stick move?
A 2.03 kg book is placed on a flat desk. Suppose the coefficient of static friction between the book and the desk is 0.542, How much force is needed to begin moving the book
A supersonic aircraft is flying parallel to the ground. When the aircraft is directly overhead, an observer on the ground sees a rocket fired from the aircraft, What is the Mach number of the aircraft
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