If Star A has a parallax angle of 3 arc seconds while Star B has a parallax angle of 9 arc seconds then we know that
A. Star A is nine times farther away.
B. Star B is three times farther away.
C. Star B is nine times farther away.
D. Star A is three times farther away.
Answer: D
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An 85.0-kg man climbs onto a 900-kg car with worn out shock absorbers and whose springs have an effective force constant of 125 kN/m. As he drives along, he hits a bump, and this starts the car oscillating with simple harmonic motion
What is the smallest amplitude of the oscillations that will cause him to bounce from his seat? A) 7.06 cm B) 7.73 cm C) 7.88 cm D) 8.95 cm E) 8.42 cm
An object is not accelerated if
A) it is acted upon by an external influence. B) its speed remains unchanged while its direction of motion changes. C) its speed and its direction of motion are both unchanging. D) its speed changes while its direction of motion remains unchanged. E) both answers B and D are correct.
A quantum of electromagnetic radiation is called a(n)
a. photon. b. electron. c. positron. d. proton.
A lens of focal length 30.0 cm is made of a material with index of refraction 1.50 . What is the focal length of a lens with the same geometry but is made of material with an index of refraction 2.00?
a. 40.0 cm c. 15.0 cm b. 60.0 cm d. 22.5 cm