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Three 15.53-g Styrofoam balls of radius 2 cm are coated with carbon black to make them conducting and then are tied to 1.15-m-long threads and suspended freely from a common point. Each ball is given the same charge, q. At equilibrium, the balls form an equilateral triangle with sides of length 13.4 cm in the horizontal plane. Determine the absolute value of q.
A herd of wild horses races across the flat, open plains of the Great Basin in central Nevada. If the horses are running at 12.1 m/s at a compass heading of 286 degrees, illustrate what is the northward component of their velocity?
What is a limiting angle of resolution
An unstrained horizontal spring has a length of 0.34 m and a spring constant of 290 N/m. Two small charged objects are attached to this spring, one at each end. The charges on the objects have equal magnitudes.
Draw a free body diagram for the skydiver in the instant after he jumps.(Assume that at this point his velocity is near zero so that air resistance is still negligible.)
A baby elephant is fixed in a mud hole. To help pull it out game keepers use a rope to apply a force A as part a. By itself, though, force A is insufficient.
A shopper pushes a cart 50 m south down one aisle and then turns 90° west and moves 28 m. He then makes another 90° turn and moves 11 m.
A heat engine has a maximum possible efficiency of 0.800. If it operates between a deep lake with a constant temperature of 287.0 k and a hot reservoir, what is the temperature of the hot reservoir?
A 186 watt motor is used to lift a 114kg container to a height of 6m. How much time does it take to lift the container with the motor.
find the lowest frequency that make constructive interference.
The rod is initially at rest and oriented horizontally and then released so that it swings to the bottom. Illustrate what are all the forces acting on the rod?
A racing car travels with a constant tangential speed of 75 m/s around a circular track with a radius 625 m. Find (a) the magnitude of the car's total acceleration and (b) the direction of its total acceleration relative to the radial direction.
The impact on light fixture swing
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