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Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = 5021 kg), which is made of steel (? = 7770 kg/m3). In typical comic-book fashion, they decide to raise the yacht (which is now on the bottom of a lake) by filling it with ping-pong balls. A ping-pong ball has a mass of 2.70 g and a volume of 3.35·10-5 m3.
How many balls are required to float the ship?
The plates of a parallel-plate capacitor are 3.00mm apart, and each carries a charge of magnitude 77.0nC. The plates are in vacuum. What is the area of each plate
Proton one moves twice as fast as proton two. The magnitude of the magnetic field in which proton one is immersed is twice the magnitude of the magentic field in which proton two is immersed.
A 5kg particle is hit with a 5N force for 0.2s towards a wall 5m away. How long does it take for the particle to hit the wall
The distance between the electron and proton in a hydrogen atom is 5.3 x10-11 m. Find the speed of the electron as it orbits the proton
Two generators use the same magnetic field and operate at the same frequency. Find the coil radius r of this other generator
An object is placed to the left of a convex lens and on the optical axis. find the magnification of the image formed by the lense
even as Jo moves off in the opposite direction at a speed of 1.27m/s. assuming that friction is negligible, find out Al's mass.
A uniform rod of mass M and length L is sitting vertically with one end resting on a frictionless surface, perfectly balanced. Find the angular velocity of rod just as it hits the ground
A 240-V dc motor has an armature whose resistance is 1.10? . When running at its operating speed, it draws a current of 16.0A, What is the back emf of the motor when it is operating normally
The Mariana trench is located in the Pacific Ocean at a depth of about 11 000 m below the surface of the water. For comparison, determine the weight of a jetliner whose mass is 8.19 × 105 kg
The current in a 100 watt lightbulb is 0.800 A. The filament inside the bulb is 0.220 mm in diameter. What is the current density in the filament
An object with a charge of 0.980 µC is placed at the center of a regular icosahedron with 20 equivalent surfaces. What is the electric flux through one surface of the icosahedron?
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