A mass is bouncing on the end of a spring with a period T when measured by a ground observer. What would the period of oscillation be (as measured by the same observer) if the mass and spring were moving past the ground observer at a speed of 0.9c?
a. 5.3 T
b. 0.40 T
c. 3.2 T
d. 2.3 T
e. 1.1 T
d
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What is the focal length of a pair of contact lenses that will allow a person with a near point of 125.0 cm to read a newspaper held 25.0 cm from his eyes?
A) -100 cm B) -31.3 cm C) 10.2 cm D) 20.8 cm E) 31.3 cm
The wavelength of coherent ruby laser light is 694 nm. What energy difference exists between the upper excited state involved and the lower unexcited ground state? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^?19 J, and 1 nm = 10?9 m)
a. 0.56 eV b. 1.79 eV c. 1.67 eV d. 2.87 eV e. 0.35 eV
The erupting geysers of nitrogen gas on Triton
A) are caused by a not yet determined internal energy source. B) can be viewed by the Hubble Space Telescope. C) produced the large liquid oceans. D) are increasing the moon's rotation rate. E) produced the frozen nitrogen surface.
The celestial sphere is a scientific model
a. True b. False Indicate whether the statement is true or false