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A 15 g piece of Styrofoam carries a net charge of -5.1 µC and floats above the center of a large horizontal sheet of plastic that has a uniform charge density on its surface. What is the charge per unit area on the plastic sheet?
An electric eel develops a potential difference of 490V , driving a current of 0.85A for a 1.0 ms pulse. Find the total energy of this pulse
Two identical particles move under the influence of a central force, for which the potential energy function is V(r) = ? (k /r) (1 ? ?a/r), Determine the ratio of the periods
Four long wires are kept on each corner of a square of side 58cm and the current of 22A flows throgh them in the direction, Find the magnitude of the net force on the wire
What is the mass in grams of 1L of helium gas as STP? (Find moles and then convert moles to grams; atomic mass =4.0grams/mol), Why do helium balloons float
In the system shown in the figure, suppose the block has a mass of 3.3 , the spring has a force constant of 450 , and the coefficient of kinetic friction between the block and the floor is 0.19. Find the work done on the block by the spring
A 1,500 kg jeep is parked on a 30 degree slope, facing uphill. Find the normal force exerted by the road on the front wheels and on the rear wheels
A gymnast is performing a floor routine. In a tumbling run she spins through the air, How much time does this maneuver take
A uniform board is leaning against a smooth vertical wall. Theboard is at an angle above the horizontal ground. Thecoefficient of static friction between the ground and the lower endof the board is 0.550. Find the smallest value for the angle, such t..
What is the vertical force on the support closest to piano.
A steel lift column in a service station is a solid cylinder 4.0 m long and 0.20 m in diameter. Young's modulus for this steel is 20 × 1010 N/m2. By what distance does the column compress
a spring with an unstrained length of 0.073 m and a spring constant of 1.8 nm hangs vertically downward from the
q1. a 8.9 kg mass is attached to a light cord that passes over a massless frictionless pulley. the other end of the
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