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A single electron orbits a lithium nucleus that contains three protons (+3e). The radius of the orbit is 2.84 x 10^-11m. Determine the kinetic energy of the electron.
mitch throws a 50 gram lump of clay with a speed of 20 m/s at a 500 gram target, find the coefficient of friction between the target and the surface
The 4{rm kg} block in the figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended and the tension in the upper string is 83N.
Ultraviolet light of wavelength 280 nm is used in an experiment on photoelectric effect with lithium (c = 2.5 eV) cathode. Find the maximum kinetic energy of the photoelectrons and (b) the stopping potential.
A 130g block slides back and forth on a frictionless surface between two springs, Find the maximum compression of the right-hand spring
A person with mass of 70kg is climbing a ladder with a length of 6 m and the ladder has a mass of 20kg that leans against a smooth, What is the magnitude of the frictional force of the floor
What is an average speed
mileposts mark distance along a highway. a car traveled from milepost 15 to milepost 185. to calculate the average
Two positive point charges, each 17?C , lie along the x-axis at x = -0.12m and x = +0.12m . Find the electric field at the point (0, 0.21m)
A ray of light is incident on the surface of a block of clear ice at an angle of 34.0° with the normal, Find the angle between the reflected and refracted light.
An earth satellite moves in a circular orbit with an orbital speed of 6000m/s. Find the time of one revolution of the satellite
A spaceship is measured to be 120 m long while it is at rest with respect to an observer. If the spaceship now flies past the observer with a speed of .99c, what length would the observer measure of the spaceship.
A 300g ball on a 70-cm-long string is swung in a vertical circle about a point 200 cm above the floor. What was the tension in the string an instant before it broke
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