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Suppose a spherical planet of radius R and an average density 5.0 x 103 kg/m3; this is approximately the average density of earth. An 80 kilogram astronaut is on the surface of the planet. The magnitude of the gravitational force of the planet on the astronaut is only 1.0 Newton. Evaluate what is the radius of the planet?
The tub of a washer into it’s spin-dry cycle, starting from rest and reaching an angular speed of 5.0 rev/s in 8.0 seconds. At this point, the person doing the laundry opens the lid, and a safety switch turns off the washer.
a 190 pf capacitor and a 760 pf capacitor are both charged to 2.4 kv. they are then disconnected from the voltage
An air conditioner operating between 86°F and 72°F is rated at 4000 Btu/h cooling capacity. What horsepower is required of the air conditioner motor
A parallel plate capacitor has plates that measure 13.5cm long by 9.75cm wide, if this capacitor is placed into a circuit with 9.50V applied to it, how much energy can the capacitor store
The drawing shows four insulated wires overlapping one another, forming a square with 0.050-m sides. All four wires are much longer than the sides of the square. The net magnetic field at the centerof the square is 72 μT directed into the drawing...
question a nearest-neighbor pair of mg2 ions are separated by a distance of square root 2 a0. calculate the coulombic
A series ac circuit contains a 270-\;{\rm{ }}\Omega resistor, a 10.0-\;{\rm mH} inductor, What is the average power delivered to the resistor, to the capacitor, and to the inductor
An electron has an initial velocity of 3.00 multiplied by 106 m/s in a uniform 10.0 multiplied by 105 N/C strength electric field. How long does it take the electron to come to rest
You are riding in an elevator on the way to the eighteenthfloor of your dormitory. The elevator is accelerating upwardwith a = 1.90 m/s2. what magnitudeof force must you apply
Four protons, each with charge +e, are fixed at the corners of a square of side length a, Determine magnitude and direction of the electric field E
A copper wire has a square cross section a on a side. The wire is L long and carries a current of I. The density of free electrons is ne. Estimate the magnitude of the current density in the wire
A ski tow operates on a 15.0o slope of length 300 meter. The rope moves at 12.0 km/h and provides power for 50 riders at one time, Find the power required to operate the tow
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