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Four charges are moving with constant velocity v along the sides of square as it is shown in the diagram. The side length is a. Determine the magnitude and direction of electric and magnetic fields by these charges at an instant when they are exactly in the middle between two consequent corners.
A massive steel cable drags a 25-kg block across a horizontal, frictionless surface. A 90.0 N force applied to the cable causes the block to reach a speed of 4.5m/s in 1.5s. What is the difference in tension between the two ends of cable.
A spring with spring constant 40N/m is attached to the ceiling, and a 5.5-cm-diameter, 1.5kg metal cylinder is attached to its lower end. what length of the cylinder is submerged
Lift on an Airplane. Air streams horizontally past a small airplane's wings such that the speed is 70.0 m/s over the top surface and 50.0 m/s past the bottom surface. If the plane has a wing area of 16.6 m2 on the top and on the bottom, what is th..
An unknown gas is introduced into the aforementioned apparatus using the same tuning fork, and the first resonance occurs when the air column is 6.14 cm long. Find the speed of sound in the gas. m/s
A golf ball, hit from the tee, travel 325 m in a direction 25 degrees south of the east axis. What are the east and north components of its displacement?
a 5.0*10^2 N laod is lifted 6.0 m with a pulley. the force exerted on the pulley rope is 165 N and the efficiency is 65 %. how far is the rope pulled
Picture yourself in the castle of Helm’s Deep from the Lord of the Rings. You are on top of the castle wall and are dropping rocks on assorted monsters that are 16.15 m below you. Just when you release a rock, an archer located exactly below you s..
If parallax can be measured with an accuracy of 0.01 arc second, and the mean density of stars in the solar neighbour is 0.1 pc^-3, how many stars can have their distance gauged via parallax?
When you take your 1400-{\rm kg} car out for a spin, you go around a corner of radius 52 m with a speed of 11 m/s. what is the force exerted on it by static friction
A small motor is mounted on the axis of a space probe with its rotor (the rotating part of the motor) parallel to the axis of the probe. Through how many revolutions has the rotor turned
Two golf balls are glued together and rotated about an axis through the point where they are joined. What is the moment of inertia of the pair of golf balls around the chosen axis
Moving a charge from point A, where the potential is 380V, to point B, where the potential is 190 V, takes 4.1×10-4 J of work. What is the value of the charge
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