Due to its larger mass, the Sun's gravitational effect on Earth's tides is greater than the Moon's
Indicate whether the statement is true or false
FALSE
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What is the ratio of the time for the capacitor in an RC series circuit to reach 90% of capacity from an empty state, to that for the circuit to discharge from a ‘full’ state to 90% capacity?
A. 9 times as long B. 1/9 as long C. The same time is required D. 1/22 times as long E. Answer depends on the particular values of R and C. F. 22 times as long
The oldest carbon isotope evidence of life indicates that life on Earth arose at least
A) 4.5 billion years ago. B) 3.95 billion years ago. C) 2 billion years ago. D) 542 million years ago. E) 65 million years ago.
The north celestial pole appears 30 degrees above your horizon. The star Vega is on your meridian. By studying your star charts and your clocks, you determine that Vega crossed the meridian in Greenwich (England) 3 hours ago. Where are you?
A) latitude 30°, longitude 45°W B) latitude 30°N, longitude 3°W C) latitude 60°N, longitude 45°W D) It is not possible to determine your longitude from the information given.
A car goes around a circular curve on a horizontal road at constant speed. What is the direction of the friction force exerted on the car by the road?
A) tangent to the curve in the forward direction B) tangent to the curve opposite to the direction of the car's motion C) perpendicular to the curve outward D) perpendicular to the curve inward E) There is no friction on the car because its speed is constant.