Time Dilation: As measured in Earth's rest frame, a spaceship traveling at 0.9640c takes 10.5 y to travel between two planets that are not moving relative to each other. How long does the trip take as measured by someone on the spaceship?
A. 2.79 y
B. 6.82 y
C. 39.5 y
D. 28.8 y
Answer: A
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Astronomers try to reconstruct our Galaxy's past from _____
A) its spherical component B) its disk component C) its spiral arms D) the stars of neighboring galaxies
Bright blue stars are typical of young ________ star clusters
Fill in the blank(s) with correct word
What is the energy of a photon with the Compton wavelength (0.00437 nm)? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, and 1 eV = 1.60 × 10^?19 J)
a. 4.55E–14 eV b. 2.84E+5 eV c. 2.84E+1 eV d. 3.52E–6 eV e. 4.55E+5 eV
A uniform ladder 15 ft long is leaning against a frictionless wall at an angle of 53° above the horizontal. The weight of the ladder is 30 pounds. A 75-lb boy climbs 6.0-ft up the ladder. What is the magnitude of the friction force exerted on the ladder by the floor?
a. 43 lb b. 34 lb c. 38 lb d. 47 lb e. 24 lb