Astronomers using a 2.0-m-diameter telescope observe a distant supernova? an exploding star. the telescope's detector records 9.1 × 10? 11 j of light energy during the first t s. it's known that this type of supernova has a visible-light power output of 6.0 × 1037 w for the first 10 s of the explosion.
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 × 108 m/s.

12 drag each label to the correct category. decide whether each statement describes mass or weight. measured in newtons measured in kilograms does not change when gravity changes === a gravitational force changes when gravity changes the amount of matter in something mass weight

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?