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. What is the height of the cliff? Note: g = 9.8 m/s2 and air resistance is negligible
a. 58 m
c. 120 m
b. 114 m
d. 197 m
D
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The maximum distance that the particles of a wave's medium vibrate from their rest position:
a) Frequency b) Wavelength c) Wave Speed d) Amplitude
In reply to a student's question, a guard in a natural history museum says of the fossils near his station, "When I started work here twenty-four years ago, they were 80 million years old, so you can add it up." Which of the following is the best conclusion that the student can make regarding the age of the fossils?
1.The fossils are less than 80,000,000 years old. 2.The fossils are still about 80,000,000 years old. 3.The fossils are 80,000,024 years old. 4.The fossils are more than 80,000,000 years old.
Why isn't Earth a perfect sphere?
A. Earth's magnetic field causes the equator to bulge out. B. Rotation causes the equator to bulge out. C. Rotation causes the poles to bulge out. D. Earth is perfectly round.
The Earth is 1.49 × 1011 meters from the Sun. If the solar radiation at the top of the Earth's atmosphere is 1340 W/m2, what is the total power output of the Sun?
A. 7.10 × 1027 W B. 2.20 × 1030 W C. 6.62 × 1026 W D. 3.74 × 1026 W E. 2.98 × 1025 W