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A 25 kg projectile is fired by accelerating it with anelectro magnetic rail on the earths surface. The rail makes a 30degree angle with the horizontal, and the guns applies a 1250 Nforce on the projectile for a distance of 7.50 m along the rail. (a.) Ignoring air resitance and friction, what it the net work doneon the projectile, by all the forces acting on it, as it moves 7.50m along the rail? (b.) Assuming it started at rest, what is thespeed after it has moved the 7.50 m?
A 5.66 microcoloumb and a -2.88microcoloumb charge are placed 16.9cm apart. Where can a third charge be placed
What is the wavelength? At what speed is the string vibrating. If the given frequency is the seventh harmonic frequency, what is the fundamental frequency of the string.
When two point charges are a distance R apart, their potential energy is -2.00 J. How far (in terms of R) should they be from each other
One day when you come into physics lab you find several plastic hemispheres floating like boats in a tank of fresh water. What is the mass of the heaviest rock that, in perfectly still water, won't sink the plastic boat
A 1.00 kg block is sitting on the top og a 10.0kg cart that is free to move on a horizontal surface. What is the maximum horizontal acceleration the cart can have
A light bulb is connected to a 120 V wall socket. The current in the bulb depends on the time t according to the relation I = (1.414 A) sin[ (125.6 Hz) t ]. What is the frequency of the alternating current
You are designing a hydraulic lift for an automobile garage. It will consist of two oil-filled cylindrical pipes of different diameters. What should be the diameter of the pipe under the platform
A 10g lead bullet at 23 degrees celsius slams into a stone wall. Assuming no loss of energy to the environment, how fast must the bullet be traveling
One end of a spring is attached to a wall. A 28N pull on the other end causes the spring to stretch by 2.8cm, What is the spring constant
a block of wood has specific gravity 0.79. When placed in water, what percent of the volume of the wood is under the surface. And what volume of the wood is above the surface
A 1.00-cm-high object is placed 4.70 cm to the left of a converging lens of focal length 7.60 cm. Find the position and height of the final image
Block one of mass 10kg is on a horizontal table. There is friction between the block and the table, the coefficient of kinetic friction is 0.25. Find the tension in the string and the acceleration
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