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If gravitational forces alone prevent a spherical, rotating neutron star from disintegrating, find the minimum mean density of a star that has a rotation period of one millisecond.
Your eye (diameter 2.5 cm) is able to focus the image of a tree on your retina. What is the size of the image of the tree on your retina
A 150MW laser pulse is focused with a lens to a diameter of 1.0?m. What is the laser beam's electric field amplitude at the focal point
A well-thrown ball is caught in a well-padded mitt. If the deceleration of the ball is 2.10×104 m/s2, what was the initial velocity of the ball
The electric field between the plates of a parallel-plate capacitor is horizontal, uniform and has a magnitude E. What is the mass of the object
a carnot efficiency engine operating between a reservoir of liquid mercury at its melting point and a colder reservoir extracts 15.0 J of heat from the mercury, What is the temperature of the colder reservoir
A firefighter on the back of the fire engine hears the sound waves after they are reflected from the wall. What is the frequency of this reflected wave as heard by this firefighter
a point charge q = +87.1 micro coulombs is held fixed at the origin. A second charge, with mass m = 0.0576 kg and charge q = +3.5 micro coulombs, Find the electric potential energy of the system of charges
A car drives along a dual carriageway at 96 km h−1. The driver sees a speed limit sign approaching and applies the brakes to decelerate to a speed of 48 km h−1. Given that the deceleration is 2.68 m s−2 discover the distance over which the brakes are..
A 194 ohm resistor is connected in series with a 5.0 µF capacitor and a 60 hertz, 120 Volt rms line. find how much does it cost to leave this circuit connected for 54 hour
a flywheel within large water pump is a solid disk with mass 21 kg and a radius of 0.45 m. starting from rest it begins
In proton-beam therapy, a high-energy beam of protons is fired at a tumor. What is the total charge of the protons that must be fired at the tumor
A 900- kg car collides with a 1200- kg car that was initially at rest at the origin of an x-y coordinate system. What was the initial speed of the lighter car
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