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Three equal point charges, each with charge 1.75mC , are placed at the vertices of an equilateral triangle whose sides are of length 0.200m . What is the electric potential energy of the system? (Take as zero the potential energy U of the three charges when they are infinitely far apart.) Use Eo = 8.85 × 10-12 F/m for the permittivity of free space.
Stretching DNA. With its double-helix structure, DNA is coiled like a spring. What's the DNA's spring constant
Two people initially separated by 75 m move toward each other. One with a speed of 3 m/s, how long is it before they meet
A circuit containing a 8 H inductor has an alternating current supplied to it. If Irms is 5.6 A and Vp is 25 V, find the frequency of the signal
Calculate the force between two wires each 0.98 m long, carrying 29 A current in opposite directions and separated by 1.6 mm
question on a windy day a leaf is blown from 5m high central branch tree. as soon as it leaves the branch it is blown
A certain automobile engine delivers 2.39 104 W (32.0 hp) to its wheels when moving at a constant speed of 25.0 m/s ( 56 mi/h). What is the resistive force acting on the automobile
A 100-W lightbulb has a resistance of about 12Ω when cold (12 C) and 140Ω when on (hot). Estimate the temperature of the filament when hot assuming an average temperature when hot assuming an average temperature coefficient of resistivity a =0.0060 ..
An arrow is shot into the air from a 5 foot platform with an initial velocity of 80 ft per second. What does the arrow reach maximum height
If the contact time with the sidewalk is 1800s, what is the magnitude of an average force exerted on the superball by the sidewalk.
an otherwise empty room contains 6 x 1026 air molecules. how many times more probable is it that they are split exactly
An object is dropped from the top of a tower at a height of 44.1 m. How much time does the object take to reach the ground
light from a helium-neon laser wavelength633 nm is focused through a pinhole prior to illuminating a 1.00 mm diameter
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