Power: A 100-W driveway light bulb is on 10 hours per day. If the power company charges 10¢ for each kilowatt-hour of electricity used, estimate the yearly cost to operate the bulb if it is used every day for a 365-day year.
A. $3.65
B. $7.30
C. $37
D. $73
Answer: C
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A spaceship with a constant speed of 0.800c relative to Earth travels to a star that is 4.30 light-years from Earth. How much time for this trip would elapse on a clock on board the spaceship?
A) 3.23 y B) 5.38 y C) 4.40 y D) 5.15 y
Which of the following is true regarding the two types of flames?
The COBE data, combined with computer simulations, strongly supported the ________ epoch, showing how ripples in the background radiation could collapse into galaxies over time
Fill in the blank(s) with correct word
The current in an electron beam in a cathode-ray tube is measured to be 280 µA. How many electrons hit the screen in 50 s? (e = 1.6 × 10^-19 C)
a. 2.2 × 10^11 electrons c. 8.8 × 10^15 electrons b. 8.8 × 10^16 electrons d. 2.2 × 10^15 electrons