How far away is the galaxy if supernova reaches magnitude
Suppose you discover a Type Ia supernova in a distant galaxy. At maximum brilliance, the supernova reaches an apparent magnitude of +10. How far away is the galaxy?
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A charged isolated metal sphere of diameter 11 cm has a potential of 9000 V relative to V = 0 at infinity. Calculate the energy density in the electric field near the surface of the sphere.
The paper dielectric in a paper-and-foil capacitor is 8.00×10-2 {rm mm} thick. Its dielectric constant is 2.50, and its dielectric strength is 50.0 {rm MV}/{rm m}. Assume that the geometry is that of a parallel-plate capacitor, with the meta
A barge has vertical sides and a flat bottom of 320ft^2 area. when partially filled, the barge is immersed in fresh water to a depth of 2.00 ft. upon removal of the load the barge rises 16.0 in. (a) what is the approximate weight of the barge? (b)
Neglecting fringing, find (a) the potential difference (in V) between the plates, (b) the initial stored energy, (c) the final stored energy, and (d) the work required to separate the plates.
A diver 32 m deep in 8°C fresh water exhales a 1 cm diameter bubble. What is the bubble's diameter just as it reaches the surface of the lake, where the water temperature is 25°C? Hint: Assume the air bubble is always in thermal equilibriu
A horizontal force of 750 N is needed to overcome the force of static friction between a level floor and a 250-kg crate. What is the acceleration of the crate if the 750-N force is maintained after the crate begins to move and the coefficient of k
What is the current in amperes in a wire of radius R = 2.91 mm if the magnitude of the current density is given by (a) Ja =J0r/R and (b) Jb = J0(1 - r/R) in which r is the radial distance and J0 = 5.87 x 104 A/m2?
You discharge the capacitor through a 4.77-Ω resistor. What is the time constant? After what multiple of the time constant does the potential difference reach 2.47 V?
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