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A 2.5-mC charge is on the y-axis at y=3.0 m and a 6.3-mC charge is on the x-axis at x=3.0 m. What is the direction of the electric potential at the origin?
An expandable cylinder has its top connected to a spring with force constant 2 x10^3 N/m. The cylinder is filled with 6 L of gas with the spring relaxed at a pressure of 1.0 atm and a temperature of 20°C.
A block is at rest on a plank whose angle can be varied. The angle is gradually increased from 0 deg. find the kinetic coefficent of friction between the block and the plank
A frictionless pulley has the shape of a uniform solid disk of mass 4.00 kg and radius 28.0cm. A 3.60 kg stone is attached to a very light wire that is wrapped around the rim of the pulley, and the stone is released from rest. As it falls down, the w..
A 5.8 m diameter merry-go-round is rotating freely with an angular velocity of 0.90 rad/s. What is the angular velocity of the merry-go-round now
An airplane needs to reach a velocity of 487 km/h to take off. On a 2000 m runway, what is the least acceleration necessary for the plane to take flight.
A 28.0 kg block is connected to an empty 2.00 kg bucket by a cord over a frictionless pulley, Calculate the mass of the sand added to the bucket.
Radium decomposes radioactively to form radon (atomic number 86, which is also the number of protons in the nucleus) by emitting an alpha-particle from its nucleus, What is the acceleration of the alpha-particle at this distance
A 14.8cm diameter loop of wire is initially oriented perpendicular to a 1.3T magnetic field, What is the average induced emf in the loop
Two loudspeakers face each other, vibrate in phase and produce identical 416 Hz tones. A listener walks from one speaker toward the other at the constant speed and hears the loudness change.
If the alternating current in a circuit is described by the equation I=20sin60t, what are the peak current and frequency
A block rests on a horizontal surface, and the coefficient of static friction between the block, Find the frequency at which the block begins to slide on the surface
A laser used in eye surgery emits a 3.08 mJ pulse in 1.04 ns, focused to a spot 32.4 um in diameter on the retina. Calculate (in SI units) the power per unit area at the retina
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