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Electric current is charge flowing per unit time. If we increase the kinetic energy of the photoelectrons (with increasing the energy of the incident photons), mustn’t the current increase, because the charge flows more rapidly? Why doesn’t it?
A 4.00 kg object is attached to a spring and placed on a horizontal, smooth surface. A horizontal force of 15.0 N is required to hold the object at rest, Find the maximum acceleration of the object
A two-ended "rocket" that is at first stationary on a frictionless floor, with its center an origin of an x axis.
Coherent light with wavelength 609nm passes through two very narrow slits, and the interference pattern is observed on a screen a distance of 3- {rm m} from the slits. The first-order bright fringe is a distance of 4.84 {rm mm} from the center of ..
In order to clearly read a book 24 cm away, a farsighted girl needs an image to be 35 cm from her eyes. What focal length is necessary for lens in her eyeglasses.
a ball is thrown horizontally from the roof of a building 45m tall and lands 24.m from the base. what was the ball's initial speed
A spherical source radiates sound uniformly in all directions. At a distance of 10 m, the sound intensity level is 80 dB. What power is radiated by this source? At what distance from the source is the intensity level 70 dB?
An electron is moving through a region of space which possessesa uniform electric field and uniform magnetic field. The electricpoint in the positive x direction and has a magnitude of E = 2,500v/m.
A softball of mass 0.200 that is moving with a speed of 7.1 collides head-on and elastically with another ball initially at rest. Afterward the incoming softball bounces backward with a speed of 3.4 .Calculate the velocity of the target ball after th..
A 3.0-m-long ladder leans against a frictionless wall. What is the minimum angle the ladder can make with the floor without slipping
a what is de broglies hypothesis? derive the formula for de broglies wavelength for a particle of mass m from the basic
A wildland fire sawyer is cutting a snag of length L = 23.5m and mass m = 880kg. He puts a Humboldt face cut on the snag which has a negligible amount of taper, what is the final angular velocity of the snag
A tradesman sharpens a knife by pushing it against the rim of a grindstone. The 35 cm diameter stone is spinning at 200 rpm and has a mass of 18 kg. The coefficient of kinetic friction between the knife and the stone is 0.20. If the stone loses 10% o..
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