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An electron gun in an old television picture tube is a device that uses an electric field to accelerate electrons. What magnitude of electric field is needed to accelerate an electron from rest to a speed of 4.0x10^7 m/s in a distance of .01m.
A puck (mass = 0.3 kg) slides without friction on a horizontal plane. It is attached by a light string (length = 1 m) to a ring on a peg. find the tension in the string as the puck revolves around the peg
A flute has a length of 58.0 cm. If the speed of sound in air is 343 m/s, what is the fundamental frequency of the flute
In a liquid with a density of 1450kg/m3 , longitudinal waves with a frequency of 390Hz are found to have a wavelength of 7.50m
IP Two point charges, the first with a charge of +3.45×10?6 C and the second with a charge of -4.10×10?6 C, Find the magnitude of the electrostatic force experienced by the positive charge
find the childs speed at the lowest point.An elevator has mass 610 kg, not including passengers. The elevator is designed to ascend, at constant speed, a vertical distance of 20.0 m (five floors) in 17.0 s and it is driven by a motor that can provi..
If the ball is released from rest at a height of 0.91 above the bottom of the track on the no-slip side, what is its angular speed when it is on the frictionless side of the track? suppose the ball is a solid sphere of radius 3.7 and mass 0.14.
A railroad freight car weighing 289 kN and traveling at 1.52 m/s overtakes one weighing 207 kN and traveling at 0.910 m/s in the same direction. Find the loss of kinetic energy during collision
In a slide or movie projector, the film acts as the object whose image is projected on a screen. how wide will the picture be on the screen
An archer pulls her bowstring back 0.360 m by exerting a force that increases uniformly from zero to 230 N. What is the equivalent spring constant of the bow? (N/m) How much work does the archer do in pulling the bow? (J)
When a potential di?erence of 150V is applied to the plates of a parallel-plate capacitor, the plates carry a surface charge density of 30.0nC/cm2, What is the spacing between the plates
A 2.00kg projectile is launched from the earth's surface with an initial velocity of 38.0 m/s at an angle of 45 degrees with respect to the horizon. What is the work done by gravity on the projectile
Consider two forces exerted on a 65kg object: one 200. N acting at 25 degrees and another of 100. N acting at 45 degrees. find the net force acting on the object
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