Describe two observational tests that support general relativity
What will be an ideal response?
Many possible answers, including: experiments in gravitational time dilation, observations of gravitational redshift, observations of gravitational lenses, evidence from binary pulsars for gravitational waves.
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A 9.00 kg mass is connected to a spring with a spring constant of 4.00 N/m. The velocity is given by the expression v(t) = 10.0 cm/s sin
+ 8.00 cm/s cos
What is the maximum displacement of the simple harmonic motion?
A. 25.1 cm B. 30.5 cm C. 35.3 cm D. 40.4 cm E. 45.5 cm
How does an antiquark differ from a quark?
A) It has a different flavor. B) It has opposite mass. C) It has a much greater mass. D) It has opposite charge. E) It is much more common in nature.
The critical density of the universe is the ________
A) density of water B) average density the universe would need for gravity to someday halt the current expansion if dark energy did not exist C) actual average density of the universe D) density of dark matter in the universe
A rock, released at rest from the top of a tower, hits the ground after 2.0 s. What is the speed of the rock as it hits the ground? (g = 9.8 m/s2 and air resistance is negligible)
a. 15 m/s c. 31 m/s b. 20 m/s d. 39 m/s