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two small spheres spaced 20.0 cm apart have equal charge. How many excess electrons must be present on each spere if the magnitude of the force of repulsion between them is 4.57 * 10 ^-21 N?
A 110kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 350N. For the first 15.00 m the floor is frictionless and for next 15 m the coefficient of friction is 0.30. What is the final speed of the crate.
The mass of the Earth is 5.98 ? 1024 kg, and the mass of the Moon is 7.36 ? 1022 kg. Locate the center of mass of the Earth-Moon system as measured from the center of the Earth
A 38.0 kg child swings in a swing supported by two chains, each 3.04m long. The tension in each chain at the lowest point is 429N. Find out the child's speeds at the lowest point.
A copper wire has a length of 50 meters and diameter of 1.6 mm. Copper has a resistivity of 1.68 x 10^-8 ohm. Calculate the resistance of the wire
A 1232.0 g mass is on a horizontal surface with ?k = 0.33, and is in contact with a massless spring with a force constant of 652.0 N/m which is compressed. What is the velocity of the mass as it loses contact with the spring
a quasars spectrum shows a shift in spectral lines of 0.158. Use the doppler-shift formula to determine what recession velocity this shift indicates, calculate the recession velocity in kms per second
How much charge can be placed on a capacitor with air between the plates before it breaks down if the area of each plate is 9.00 cm2
A satellite orbits a planet of unknown mass in a circle of radius 2.3 x 107 m. The magnitude of the gravitational force on the satellite from the planet is F = 89 N. What is the kinetic energy of the satellite in this orbit
write a two to three page paper in which you1.provide at least three reasons for believing in the accuracy or
q1. at a factory a noon whistle is sounding with a frequency of 491 hz. as a car travelling at 78 kmh approaches the
A speedboat starts from rest and accelerates at +2.01 m/s2 for 7.25 s. At the end of this time, Find the total displacement of the boat
Technetium-99 has an excited state that decays by emission of a gamma ray. The half-life o fthe excited state is 360 min. What is the activity, in curies, of 1.00mg of the excited isotope
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