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Two point charges are placed along a horizontal axis with the following values and positions: +3.0μC at x=0 cm and-7.0μC at x= 20 cm. At what point along the axis is the electric field zero?
A 5,20 g bullet moving at 672 m/s strikes a 700 g wooden block at rest on a frictionless surface. What is the speed of the bullet-block center of mass
What would be the electric current intercepted by the total surface area of the planet?
An electron travels with v=4.40 x 10^6 i m/s through a point in space where E=(2.1 x 10^5 i, -2.1 x10^5 j) V/m and B =-.12k T. What is the force on the electron
The verical displacement of a string is given by y(x,t)=(6.00 mm) cos[(3.25m^-1)x-(7.22s^-1)t]. What is the speed of the wave
Determine the magnitude of the emf EMF induced in the loop after exactly time 6.00 s has passed since the circumference of the loop started to reduce.
a particle is moving in the xy plane with constant acceleration. at t=0, it has a velocity of v=(4.00i-5.00j) m/s. At t=4.00 s, determine the acceleration of the particle (magnitude and direction)
A 4.3-m long plank with a weight of 164 N is place on a dock with 1.4 m of its length extended over the water. How far from the edge of the dock can the boy move until the plank is just on the verge of tipping
A soldier has a huge contraption that notches a large 4 kg arrow (it looks more like a lance) in a massive bow and uses a winch system to draw the arrow back to set the bow. What is the speed of the arrow
Suppose you have a spherical balloon filled with air at room temperature and 1.0 atm pressure; its radius is 8cm. what's the balloon's new radius
A chair of mass 10.5 kg is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force F = 44.0 N, calculate the normal force that the floor exerts on the chair
A guitar string is under a tension of T = 198N. The string has a mass of m = 99g and length L. What is the length of the string in m
a moto-cross rider is airborn after a jump. Each wheel of his bike has a rotational intertia of .760 kg m2, What will his (bike and all) angular speed be after the wheel stops
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