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Compressed air can be pumped underground into huge caverns as a form of energy storage. The volume of a cavern is 6.00 105 m3, and the pressure of the air in it is 8.20 106 Pa. Assume that air is a diatomic ideal gas whose internal energy U is given by U = 5/2 nRT. If one home uses 28.0 kW · h of energy per day, how many homes could this internal energy serve for one day?
A certain medical machine emits x-rays with a minimum wavelength of 0.025 nm. One day, the machine has an electrical problem and the voltage applied to the x-ray tube decreases to 80 percent of its normal value. Now what is the minimum x-ray wavel..
35MW of power at 45kV (rms) arrives at a town from a generator via 3.4? transmission lines. Calculate the fraction of the power generated that is wasted in the lines
The forward airspeed of an airplane is 75.0 m/s, and an airplane propeller turns at 2400 rpm. What is the maximum possible propeller radius
A sanding disk with rotational inertia 5.4 x 10-3 kg·m2 is linked to an electric drill whose motor delivers a torque of magnitude 10 N·m about the central axis of the disk. About that axis and with torque applied for 72 ms, what is the magnitude o..
What is the magnitude of the vertical component of its velocity as it strikes the ground.
A molecule of DNA (deoxyribonucleic acid) is 2.09 µm long. The ends of the molecule become singly ionized: negative on one end, compute the effective spring constant of the molecule
A bird feeder in the shape of a 50-cm-diameter disk of mass 340 g, suspended by a wire with torsional constant 5.00N?m/rad, What is the mass of the birds, assuming they have the same mass
An iced tea glass is 15 cm tall and has a diameter of 8.0 cm. The glass sits on a garden table on a sunny day and is completely filled to the brim with water, What is the value of the angle
If this lens is then immersed in water with a refractive index of 1.33, what will the focal lens of the lens be in this environment
A crate is pulled by a force (parallel to the incline) up a rough incline. The crate has an initial speed of 1.5m/s. The crate is pulled a distance of 7.5 m on the incline by a 150 N force. The acceleration of gravity is 9.8m/s² mu=0.15
A hypothetical nucleus weighs 1 lb. How many nucleons are in this nucleus and What is the radius of this nucleus
A power station with an efficiency of 0.5 generates 10^8W of electric power and dissipates 1.00 x10^8 W of thermal energy to the cooling water that flows through it.
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