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How many electrons must be removed from each of two 4.8-kg copper spheres to make the electric force of repulsion between them equal in magnitude to the gravitational attraction between them?
(a) Calculate the lowest energy of the electron in He+. Is it lower than that of H (b) If this electron absorbs a photon and makes a transition to the 2p orbital
In a fast-pitch softball game the pitcher is impressive to watch, Determine the angle of the total acceleration relative to the radial direction
a projectile is fired with an initial velocity of 35 m/s at an angle of 30 degrees above horizontal of a 30 feet tall building. find (a) the max height of the projectile
There are two categories of ultraviolet light. Ultraviolet A ( UVA ) has a wavelength ranging from 320nm to 400nm. What are the ranges of the wave numbers for UVB
Three identical train cars, coupled together, are rolling east at speed . A fourth car traveling east at 2 catches up with the three and couples to make a four-car train. What is the speed of the five-car train
A spherical mirror forms an image that is virtual, one-quarter of the size of the object, and 3cm from the mirror. Find the focal length of the mirror, and draw the corresponding ray diagram.
Flywheels are large, massive wheels used to store energy. How long does it take the flywheel to reach top speed
What linear speed must an Earth satellite have to be in a circular orbit at an altitude of 206 km above Earth's surface, What is the period of revolution
A 9.0 ohm resistor and a 6.0 ohm resistor are connected in series with a power supply. Find the voltage setting of the power supply
When nine people whose average mass is 88 kg sit down in a car, they find that the car drops 1.42 cm lower on its springs. What is the frequency of the car's vibration if its mass (empty) is 1700 kg
q1. give some examples of the applications of lasers in the medical field industry and in commerce?q2. describe total
How many vectors may be added by the polygon method? Are other methods of vector addition limited to the number of vectors that can be added
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