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Three point charges, -6.05 10-9 C, -9.75 10-9 C, and +7.50 10-9 C, are fixed at different positions on a circle. The total electric potential at the center of the circle is -2090 V. What is the radius of the circle?
A 45kg pole-vaulter running at 12 m/s vaults over the bar. Her speed when she is above the bar is 1.90m/s. Avoid air resistance and determine her height as she crosses the bar.
A 1.20 liter flask contains a certain quantity of ideal gas at 305 K. after that an equal number of molecules of the same gas are added to the flask, after which the absolute pressure is 1.30 times its unique value. What is the final temperature.
A mode-locked, titanium-sapphire laser has a wavelength of 850 nm and produces 100 million pulses of light each second. What is the average power produced by the laser
Two particles with masses m and 3m are moving toward each other along the x axis with the similar initial speeds vi. Particle m is traveling to the left, while particle 3m is traveling to the right.
A cannon is fired horizontally with a velocity of 35.0 m/s from a height of 10 meters. With what total velocity does it strike the ground
A 85.0 kg fullback is running at 3.86 m/s to the east and is stopped in 0.800 s by a head-on tackle by a tackler running due west. Calculate the impulse exerted on the tackler
The big mall near Sally and Amy's city has extended their operating hours to accommodate the huge crowds expected for the After Thanksgiving Sale. How long were they in the mall
two 8.00 kg blocks are connected by a massless string over a frictionless pulley of radius 10.0 cm and rotational inertia, I. What is the inertia of the pulley
As part of a safety investigation, two 1900 cars traveling at 25 are crashed into different barriers. Find out the average forces exerted on (a) car that hits a line of water barrels and takes 1.8 to stop, and (b) car that hits a concrete barrier an..
A child ties a rock to a string and whirls it around in a horizontal circle. Find the period of its uniform circular motion
Two large parallel metal plates are 1.4 cm apart and have charges of equal magnitude but opposite signs on their facing surfaces. what is the electric field (in V/m) in the region between the plates
Suppose the rotational kinetic energy of a solid disc is 1000 J when the disk has an angular velocity of 3 rad/s. What is the disk's moment of inertia
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