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What must the volume ratio of concrete to Styrofoam be if the pontoon is to float with 45.9% of its overall volume above water?
Concider a plane circular surface (radius of 2cm) located at the center of the solonoid with its axis coinsidal with the axis of the solonoid. What is the magnetic flux through the surface. (1wb=1t-
Ages later when the universe was 1s old, the temperature fell to only 10^10. What is the probability that two average protons could fuse in this second?
Students want to construct a scattering experiment using a power source of 5.5 Mev alpha-particles to scatter from a gold foil.
You are a blackbody with a temperature 98.6 degrees F. (a) What is the total energy density of the radiation you emit?
After a star like the Sun stops producing energy via fusion, it collapses into a degenerate object called a white dwarf, with a size similar to Earth. Take the mass of the Sun to be 2.00 x 10^30kg,
It is important for nuclear engineers to know the thermal properties of neutrons in a nuclear reactor. Assuming a gas of neutrons in thermal equilibrium, find v "bar" and v* (*indicates most probabl
Find an expression for the value of capacitance C if the charging energy associated with the coulomb blockade for the capacitor is the same as Eo.
In a certain binary-star system, each star has the a mass of 1.20 x 1030 kg, and they revolve about their center of mass. The distance between them is 1.5 x 108 km. What is their period of revolution
A orbiting satellite stays over a certain spot on the equator of (rotating) Earth. What is the altitude of the orbit (called a "synchronous orbit")?
Engine oil at 200 oC is forced over a 20-cm-square plate at a velocity of 1.2 m/s. The plate is heated to a uniform temperature of 60°C. Calculate the heat lost by the plate.
A slingshot fires a pebble from the top of a building at a speed of 15.0 m/s. The building is 30.0 m tall. Ignoring air resistance, find the speed with which the pebble strikes the ground when the p
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 3.81 x 105 N. In being launched from rest it moves throu
In addition, friction does -250 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the skateboarder is 5.56 m/s. (a) Calculate the change (PEf - PE0)
In being launched from rest it moves through a distance of 41.3 m and has a kinetic energy of 6.09 x 107 J at lift-off. What is the work done on the jet by the catapult?
After inhaling most humans will float in fresh water, albeit with only a small fraction of their body above water. After exhaling they might start to sink slowly. From this, what should be the appro
The MetLife blimp, Snoopy One, is moving at a constant velocity of 18.93 m/s. Its velocity vector makes an angle of 15 degrees with respect to the horizontal. When it is 490.0 m above the ground, on
Given that the energy difference between the first 2 energy levels is 0.3 eV, the effective mass of electron in the quantum well is 0.067m, and m is the free electron mass.
The mass of the calculator is 24 grams, and the coefficient of kinetic friction is 0.5. If it comes to rest after 0.9 seconds, what was its initial velocity?
A spherical mirror is polished on both sides. When the concave side is used as a mirror, the magnification is +3.7. What is the magnification when the convex side is used as a mirror, the object rem
The image of this second object has the same height as the other image. How far in front of the mirror is the second object located?
A 4.4cm diameter parallel-plate capacitor has a 0.48mm gap. What is the displacement current in the capacitor if the potential difference across the capacitor is increasing at 500,000V/s
They are still here, for the most part. The former can be observed and their density is measured to be about 500 photons/cm^3, thus, there must be about that number density of neutrinos in the unive
Suppose that the speed of light in a vacuum were one million times smaller than its actual value: c = 3.00 × 102 m/s. The spring constant of a spring is 690 N/m. Determine how far you would hav
Radium is a radioactive element whose nucleus emits an alpha particle (a helium nucleus) that has a kinetic energy of about 6.8 × 10-13 J (4.2 MeV). To what amount of mass is this energy equiv