Based on the video, which Venus phase would be impossible to see (from Earth) if Venus orbited Earth as described in Ptolemy's Earth-centered model?
a. crescent on the right side
b. gibbous (nearly full)
c. new
d. crescent on the left side
Answer: b. gibbous (nearly full)
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A horizontal plank (m = 2.0 kg, L = 1.0 m) is pivoted at one end. A spring (k = 1.0 × 103 N/m) is attached at the other end, as shown in the figure. Find the angular frequency (in rad/s) for small oscillations.
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A. 39 B. 44 C. 55 D. 66 E. 25
A supernova is up to 50,000 times less luminous than a normal nova and lasts for a much shorter period
Indicate whether the statement is true or false
The oldest fossils on Earth
a. show that life began in Africa. b. show that life began in lush regions between large rivers. c. show that life began in the oceans. d. are at least 5 billion years old. e. at most 5 million years old.
Consider some water at 6°C. For a slight increase its temperature the water will
A) expand. B) contract. C) remain the same.