When the noonday Sun is overhead in London, England, on April 15, what are the standard time and date in San Francisco?
4 A.M., April 15
Physics & Space Science
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Both He3 and He4 are important in the proton-proton cycle. How are they different, and which comes first?
What will be an ideal response?
Physics & Space Science
Your mass is 50 kg. Suppose you are standing on a scale in an elevator that is approaching a top floor and decreasing its speed at the rate of 3 m/s every second. What would be the reading on the scale?
A. 0 N B. 150 N C. 740 N D. 640 N E. 340 N
Physics & Space Science
The earliest Homo sapiens appeared about
A) 25 million years ago B) 6 to 7 million years ago C) 200,000 years ago D) 545 million years ago
Physics & Space Science
What is the f-number of a camera lens that has an aperture-opening diameter of 0.30 cm and a focal length of 6.0 cm?
a. 0.30 b. 1.8 c. 20 d. 6.0 e. 0.05
Physics & Space Science