A stone is thrown at an angle of 30° above the horizontal from the top edge of a cliff with an initial speed of 14 m/s. A stop watch measures the stone's trajectory time from top of cliff to bottom to be 7.1 s. How far out from the cliff's edge does the stone travel horizontally? Note: g = 9.8 m/s2 and air resistance is negligible
a. 58 m
c. 86 m
b. 68 m
d. 197 m
C
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A) habitats. B) landmasses. C) plant and animal life. D) landmasses, and plants and animals and their habitats.
Volcanic heat comes from
A. radioactive explosions B. the weight of rock C. accumulated sunlight D. fusion deep in the Earth
Three point charges, two positive and one negative, each having a magnitude of 20 ?C are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on the negative charge?
A. 80 N B. 40 N C. 69 N D. 57 N E. 75 N
During a total lunar eclipse, which of the following are true? I. The photosphere of the Sun is obscured by the Moon. II. The Moon is in Earth's umbra. III. The Moon is new. IV. The Moon is full
a. I, III b. II, IV c. I, II, III d. II, III e. I, II, III, IV