A package is dropped from a helicopter moving upward at 15 m/s. If it takes 16.0 s before the package strikes the ground, how high above the ground was the package when it was released if air resistance is negligible?
A) 810 m
B) 1000 m
C) 1200 m
D) 1500 m
B
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What is so unique about the mirrors of telescopes such as the Keck Observatory, Gran Telescopio Canaries and the soon-to-be-built Giant Magellan Telescope? a. The mirrors are made of a newly designed metallic material. b. The mirrors can fold up went not in use
c. The mirrors are inexpensive. d. The mirrors are segmented. e. The mirrors are thin.
The dynamo effect is believed to produce the ____________________ of the Sun
Fill in the blank(s) with correct word
When using different points in the Earth's orbit as a baseline for a parallax experiment it is best to do the observations:
A. 1 day apart. B. 6 months apart. C. 1 month apart. D. 1 year apart. E. 2 years apart.
A bowling ball exerts a force on the pins when it strikes them, knocking them down. The force of the pins on the ball is ________.
A. larger than the force of the ball on the pins B. less than the force of the ball on the pins C. the same as the force of the ball on the pins D. either less or more, depending on how hard the ball is thrown E. A system of ten bowling pins is too complicated to know the force on the ball.