How many atoms fit across the period at the end of this sentence?
A) hundreds
B) thousands
C) millions
D) billions
E) more than you could count in a lifetime
C
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Applications to Astronomy: A star has absolute luminosity equal to that of the sun but is 10 pc away from the Earth. By what factor will it appear dimmer than the sun? The earth is 1.5 × 108 km from the sun, and 1 parsec is equal to 3.09 × 1016 m.
A. 2 × 10-9 B. 2 × 10-11 C. 2 × 10-13 D. 2 × 10-15
Equilibrium: A 120-kg refrigerator that is 2.0 m tall and 85 cm wide has its center of mass at its geometrical center. You are attempting to slide it along the floor by pushing horizontally on the side of the refrigerator. The coefficient of static friction between the floor and the refrigerator is 0.30. Depending on where you push, the refrigerator may start to tip over before it starts to slide along the floor. What is the highest distance above the floor that you can push the refrigerator so that it will not tip before it begins to slide?
A. 0.71 m B. 1.0 m C. 1.2 m D. 1.4 m E. 1.6 m
Daylight hours and night hours are equal in duration throughout the year at the ______________
Fill in the blank(s) with correct word
A transformer is designed to step down the 120V line voltage to 9V. If there are 400 turns on the input coil, how many turns should there be on the output coil?