When boarding an airplane you bring a bag of chips. While in flight the bag puffs up, because
A) air pressure in the air-tight bag is greater than cabin air pressure.
B) suction is occurring.
C) air pressure is affected by the Bernoulli principle.
D) all the above
E) none of the above
Answer: A
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In the context of a big bang model, identify a true statement about the flatness problem
A) It is the peculiar circumstance that the early Universe's average density was much more than the critical density but it was still flat. B) It is the peculiar circumstance that the actual density of the Universe will always be equal to the critical density and will always remain flat. C) It is the peculiar circumstance that the early Universe must have contained exactly the right amount of matter to make space-time flat. D) It is the peculiar circumstance that the early Universe's average density was considerably less than the critical density but it was still flat.
Seyfert galaxies
a. are more common in close pairs of galaxies than in isolated systems. b. emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. c. generally show red shifts greater than 6. d. a and b e. a, b and c
Pluto was discovered in
A) ancient times. B) 1789. C) 1859. D) 1930. E) 1992.
A 1.6-kg block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 190 N/m. The block is pulled from its equilibrium position at x = 0.00 m to a displacement x = +0.080 m and is released from rest
The block then executes simple harmonic motion along the horizontal x-axis. What is the velocity of the block at time t = 0.40 s? A) 0.82 m/s B) -0.82 m/s C) 0.30 m/s D) -0.30 m/s E) 0.00 m/s