If telescope A is 160 cm in diameter, and telescope B is 32 cm in diameter, how much more light does telescope A gather than telescope B?
a. 5 times
b. 10 times
c. 20 times
d. 25 times
e. 100 times
d
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What is an ionization nebula?
A) a region of hot, low-density gas surrounding a recent supernova B) a clump of gas that will soon give birth to a new star C) a colorful cloud of gas that glows because it is heated by light from nearby hot stars D) a name sometimes used to describe spiral galaxies besides the Milky Way
A construction worker pulls a box of tools on a smooth horizontal floor with a force of 100 N in a direction of 37.0° above the horizontal. The mass of the box and the tools is 40.0 kg
(a) Draw a free-body diagram for the box. (b) Calculate the acceleration of the box. (c) How hard does the floor push up on the box?
At a distance D from a very long (essentially infinite) uniform line of charge, the electric field strength is 1000 N/C. At what distance from the line will the field strength to be 2000 N/C?
A) 2D B) D C) D/ D) D/2 E) D/4
If R1 = 3.0 ?, R2 = 6.0 ?, R3 = 12 ?, and I = 0.50 A, at what rate is heat being generated in R1?
A. 20 W B. 17 W C. 12 W D. 31 W E. 6.0 W