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Q. Three point charges are arranged at the corners of a square, with charge -Q on both the particle at the upper left corner and the particle at the lower right corner and with charge +2Q on the particle at the lower left corner. (i) what is the direction of the electric field at the upper right corner, which is a point in empty space? (ii) suppose the +2Q charge at the lower left corner is removed. then does the magnitude of the field at the upper right corner (a) become larger (b) become smaller (c) stay the same (d) change unpredictably?
David is driving a steady 21 m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.20 m/s^2 at the instant as David passes.
Fred and Barney are two electric charges that are initially held 1 meter apart and experience an electric repulsion of 10 pounds of force. What would be the force of repulsion between them be if the two were moved closer together so that they were..
A cannonball shot with the initial velocity of 129 m/s at an angle of 36° follows a parabolic path and hits a balloon at the top of its trajectory. Neglect air resistance, how fast is the cannonball going as it hits the balloon.
A box weighing 300N is shoved across the floor of an apartment by a force of 400 N exerted downward at an angle of 35.2° below the horizontal. If the coefficient of kinetic friction between the box and the floor is 0.540, how long does it take to mov..
What is the gauge pressure of the water at the pump? Suppose steady, laminar flow of water, no viscosity, and no air drag on the water jet. The acceleration of gravity is 9.81 m/s2.
Six mass pieces of 100g each are placed on a mass holder of 140g which is hung from a string. Analyse the tension in the string.
What is the magnitude of the vertical component of its velocity as it strikes the ground.
In an effort to stay awake for an all-night study session, a student makes a cup of coffee by first placing a 200 W electric immersion heater in 0.320kg of water.
A 0.180 kg baseball, travelling 32.0 m/s, strikes catcher's mitt that recoils 13.0 cm in bringing the ball to rest. What was an average force (in newtons) applied by the ball to the mitt.
A steel aircraft carrier is 385 m long when moving through the icy North Atlantic at a temperature of 1.65°C. By how much does the carrier lengthen whereas it is travelling in the warm Mediterranean Sea at the temperature of 23.30°C.
A plane flies from base camp to Lake A, 280 km away in the direction 20° north of east. After dropping off supplies it flies to Lake B that is 190 km at 30° west of north from Lake A. Graphically find out the distance and direction from Lake B to ..
Estimate the current in an L-R circuit for t>T if the EMF is (12/T) t for 0
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