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A point charge of +2Q is placed at the center of a square. When a second point charge of -Q is placed at one of the square's corners, it is observed that an electrostatic force of 4 N acts on the positive charge at the square's center. Now, identical charges of -Q are placed at the other three corners of the square. What is the magnitude of the net electrostatic force acting on the positive charge at the center of the square?
A mass m is attached to an ideal cord of length L (figure at left). What is the tension in the cord at that moment
A 5 kg block, measuring 10 cm per side, is held 50% submerged in water by a helium balloon. what is the diameter of the balloon
Two cars of equal mass collide on a horizontal frictionless surface. What is the speed of the composite body (AB) after the collision
Does the growth of a plant or animal violate the second low.
A parallel-plate air capacitor is made by using two plates 19 cm square, spaced 3.5 mm apart. It is connected to a 3-V battery. What is the electric field between the plates
A 160 lb person has a mass of 160/32 = 5 slugs. A 160 lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios
A net torque of 36N*m acts on a wheel rotating about a fixed axis for 6 s. During this time the angular speed of the wheel increases from 0 to 12 rad/s. What is the magnitude of the frictional torque
If the magnetic field strength is 0.845 T, what is magnitude and direction of the magnetic force on the wire between the poles
A photographer uses his camera, whose lens has a 40mm focal length, to focus on an object 5.0m away. How far must the lens move to focus on this second object
A ski jumper starts from rest 59.0 m above the ground on a frictionless track and flies off the track at an angle of 45.0° above the horizontal and at a height of 16.0 m above the ground, What is the maximum altitude she attains after leaving the t..
The spring balance is reasonably accurate for determining the load mass, Explain how to use the Workin = Workout principle to verify the mass of the spring balance
A 2.30 cm diameter tungsten sphere is heated to a temperature of 2000 degree C. At this temperature tungsten radiates only 30% of the energy radiated by a blackbody of the same size and temperature.
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