Using absolute magnitudes for the sun of mb = 5.48, mv = 4.83, and mr = 4.42, calculate the fluxes fλ (in units of erg cm−2 s −1 ˚a−1 ) and fν (in units of jy) received at earth from the sun when observing with the b, v , and r filters. ignore any absorption by the earth’s atmosphere.
(c) the st magnitude system is designed so that, for any filter, apparent magnitude zero corresponds to fλ = 3.63 × 10−9 erg cm−2 s −1 ˚a−1 . determine the apparent and absolute b, v , and r magnitudes of the sun in the st system.
(d) the ab magnitude system is designed so that, for any filter, apparent magnitude zero corresponds to fν = 3.63 × 10−20 erg cm−2 s −1 hz−1 = 3630 jy. determine the apparent and absolute b, v , and r magnitudes of the sun in the ab system.

A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

How do the measurements of charge at the different locations on the sphere compare to each other? the charge measurements are different at all locations on the sphere. the charge measurements are virtually not the same at all locations on the sphere except for the charge at the very top and at the very bottom that are equal. the charge measurements are virtually the same at all locations on the sphere except for the charge at the very top. at the top, the conductive sphere has a small disk that is made of different material. the charge measurements are the same at all locations on the sphere. what happens to the charge on the conductive sphere when it is connected to a source of charge such as the electrostatic voltage source? nothing will happen because no charge goes around the surface of the sphere. the charge on the conductive sphere spreads out over the surface of the sphere; being greater in some specific locations on the sphere. the charge on the conductive sphere spreads out uniformly over the surface of the sphere. the charge on the conductive sphere spreads out non-uniformly over the surface of the sphere.