Astronomers using a 2.0-mm-diameter telescope observe a distant supernova−−an exploding star. The telescope's detector records 8.7 ×× 10−11−11 JJ of light energy during the first 10 ss. It's known that this type of supernova has a visible-light power output of 4.5 ×× 103737 WW for the first 10 ss of the explosion. Part A How distant is the supernova? Give your answer in light years, where one light year is the distance light travels in one year. The speed of light is 3.0 ×× 1088 m/sm/s. Express your answer in light years. View Available Hint(s)for Part A dd = lyly Submit Provide Feedback Next

Asteady current of 1 ais flowing through a conducter calculate the number of electrons that flows through conductor in 1second

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?