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Use the mass density of radiation in the preceding problem to determine the mass density of radiation when T = 2.725 K. How does this compare with the average density of matter in the universe? Does this mean we are in a radiation-dominated or matter- dominated universe?
A 50 turn circular coil of radius 5 cm and resistance 2 ohm is placed in a magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies in time according to the expression B=0.01t^2+0.04t^3, where t is in..
The Sun has an apparent magnitude of -26.8 and absolute magnitude of 4.8 Calculate the apparent magnitude it would have at the distance of αCentauri (1.3 pc).
A spherical conducting shell has an interior radius of 18 cm and an outer radius of 21cm. The shell carries a net charge of -2.4 micro coulombs. A point charge of charge +6.4 micro coulombs is placed at the center of spherical shell.
An alpha particle (the nucleus of a helium atom) consists of two protons and two neutrons. what is the strength of the magnetic field
A pulley system is used to lift a 52kg crate. One chainconnects the upper pulley to the ceiling, and the secondchain connects the lower pulley to the crate. The crateis raising with an acceleration of 2.0 m/s^2.
An ice skater spins at .8 rev/s with arms extended. Pulls arms in and spins 5.3 rev/s. Change of moment of inertia is what factor of original.
A projectile is launched at 64 degrees at 63.7 m/s from the top of a hill. How far down the hill does the projectile hit
Two slits separated by a distance of d = 0.11mm are located at a distance of D = 660mm from a screen. The screen is oriented parallel to the plane of the slits. The slits are illuminated by a coherent light source with a wavelength of lambda = 536..
On a roller coaster the first hill has a height of 30m while the second hill as a height of 15m. what is its speed at the top of the second hill
A chimney sweep is climbing a ladder that leans against the side of a house. find the displacement of her feet from base when she has climbed twice as far
The central star of a planetary nebula emits ultraviolet light with wavelength 104nm. What is the first-order diffraction angle
A person sitting in a stationary boat notices the waterwaves passing by the bow of the ship once every 4 seconds. At what speed are the water waves moving
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