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You, Archimedes, suspect that the king?s crown is not solid gold but is instead gold-plated lead. To test your theory, you weigh the crown, and find it to weigh 60.0 N, and to have an apparent weight of 55.8 N when it is completely submerged in water. Take the density of gold to be 19300 kg/m^3, the density of lead to be 11340 kg/m^3, and the density of water to be 1000 kg/m^3. Also, use g = 9.8 m/s^2.
What percentage (by weight) of this crown is made of gold? The rest, we assume, is lead.
Two positive point charges each have a charge of +q and are fixed on the y axis at y = +a and y = -a. (Use the following as necessary: k, q, a, and x.), Find the electric potential at any point on the x axis
The current in a solenoid with 21 turns per centimeter is 0.45A, Find the magnitude of the net magnetic field a radial distance of 0.70 cm from the straight wire.
Sam's speed at the bottom is 35.0. Illustrate what is the coefficient of kinetic friction of his skis on snow?
A blue car with mass mc = 428 kg is moving east with a speed of vc = 20 m/s and collides with a purple truck with mass mt = 1284 kg, What is the magnitude of the initial momentum of the car
There are two identical, positively charged conducting spheres fixed in space. find the initial charge on each sphere
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 19.0° below the horizontal, Find the car's position relative to the base of the cliff when the car lands in the ocean
You're planning to study in Europe, and you want a transformer designed to step 230 V. how many should the secondary have
Ray decides to paint the outside of his uncle's house. He uses a 4.0-m-long board supported by cables at each end to paint the second floor. find the force that the right cable exerts on the board
A 3-m-long rigid beam with a mass 120 {rm kg} is supported at each end. An 70 {rm kg} student stands 2.0 {rm m} from support 1. How much upward force does support 1 exert on the beam.
Two large parallel plates stand side by side with a distance of 2.10 cm between them, Find the acceleration of the electron, Find the magnitude and direction of the electric field in the region between the plates
What is the speed of the center of mass
In the figure below, a butterfly net is in a uniform electric fieldof magnitude E = 3.0 mN/C.The rim, a circle of radius a = 10 cm, is aligned perpendicular to the field. Thenet contains no net charge. Find the electric flux through the netting.
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