Two small objects, with masses m and M, are originally a distance r apart, and the gravitational force on each one has magnitude F. The second object has its mass changed to 2M, and the distance is changed to r/4. What is the magnitude of the new gravitational force?
A. 32F
B. 2F
C. F/32
D. F/16
E. 16F
Answer: A. 32F
Physics & Space Science
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An optical fiber having index of refraction 1.40 is clad with a material of index of refraction 1.25. What is the critical angle for this fiber?
A. 63.2
B. 26.8
C. 41.8
D. 73.0
E. 16.5
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Stars are continually forming in the halo of our Galaxy today
Indicate whether the statement is true or false
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Some of the moons of the jovian planets have significant atmospheres
Indicate whether the statement is true or false
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A solid state pulsed laser has an energy of 400 mJ per pulse. If its wavelength is 1.06 × 10^?6 m, how many photons are in each pulse?
a. 2 × 10^25 b. 2 × 10^21 c. 3 × 10^18 d. 6 × 10^38 e. 2 × 10^18
Physics & Space Science