A meteor ______________ results when a large number of meteoroids enter Earth's atmosphere
a. fall
b. landing
c. group
d. explosion
e. shower
e
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A moderate force will break an egg. However, an egg dropped on the road usually breaks, while one dropped on the grass usually doesn't break. This is because for the egg dropped on the grass:
a. the change in momentum is greater. b. the change in momentum is less. c. the time interval for stopping is greater. d. the time interval for stopping is less.
Henrietta Leavitt discovered the period-luminosity relationship for ____________________
Fill in the blank(s) with correct word
Which of the following greatly improves the angular resolution of radio maps?
A) Schmidt corrector plates B) more sensitive spectrometers C) switching from film to CCD imaging D) use of interferometers E) chilling the infrared detectors
A 2 000-kg sailboat experiences an eastward force of 4 500 N by the ocean tide and a wind force against its sails with magnitude of 1 500 N directed toward the northwest (45° N of W). What is the direction of the resultant acceleration?
a. 27° N of W b. 58° N of W c. 27° N of E d. 17° N of W e. 17° N of E