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An early model for an atom considered it to have a positively charged point nucleus of charge Ze, surrounded by a uniform density of negative charge up to a radius R. The atom as a whole is neutral. For this model, what is the electric field at a distance r from the nucleus?
A certain type of laser emits light that has a frequency of 4.9 × 1014 Hz. How many wavelengths are there in one pulse
each second 5e23 nitrogen molecules (m=4.65e23 g) collide with a 10cm2 wall assume that the molecules all travel with a common speed of 290m/s, What is the pressure on the wall
q1. an ambulance travelling at 39 ms approaches a car heading in the same direction at a speed of 19 ms. the ambulance
A 535 g ball swings in a vertical circle at the end of a 1.4 m-long string. When the ball is at the bottom of the circle, the tension in the string is 22 N. Illustrate what is the speed of the ball at that point?
A ray of light passes from air through dense flint glass and then back into air. How far is the ray displaced as a result of traveling through the glass
A 200, 47.0 cm-diameter turntables rotate on frictionless bearings at 70. A 24.0 block sits at the center of the turntable. A compressed spring shoots the block radically outward along the frictionless groove in the surface of turntable.
q1. a 484g oscillator has a speed of 121 cms when its displacement is 2.10 cm and 56.0 cms when its displacement is
Boat A negotiates a curve whose radius is 370 m. Boat B negotiates a curve whose radius is 120 m. Each boat experiences the similar centripetal acceleration. What is the ratio of speed of boat A to that of boat B.
A 20.00 kg child is on a swing that hangs from 3 m long chains. What is her maximum speed if she swings out to a 45.0 o angle.
A 40.0-kg shell is fired from a gun with a muzzle velocity 85.0 m/s at 29.0o above the horizontal. What is the horizontal speed of the other fragment
The pressure of a garden hose is 2 atmospheres. If the cross-sectional area of the hose is 4 cm^2 and the nozzle output area is .4cm^, How fast does the water leave the hose
Consider a regular hexagon of side length, L = 10cm. A charge, Q = 2µC, is located at each vertex, Find the electric field vector at the center
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