How does the force of gravity between galaxies affect the recessional velocity of the galaxies? How would this affect the value of Hubble's constant? The calculated age of the universe? Explain your answers
The effect of gravitational force on galaxies will decrease the recessional velocity of
the galaxies. Hubble's constant will be smaller because the constant is proportional to
the velocity. This will give an increase in the calculated age of the universe.*
* Current findings show, however, that this effect may be completely canceled by some unknown, even
stronger repulsion force that appears to be causing the overall expansion rate of the universe to be
accelerated, not slowing down at all.
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How is radioactive dating used to determine the age of an object?
a. Both the amounts of radioactive and decay material are measured. Using these with the radioactive material's half-life, the age can be estimated. b. The amount of radioactive material is measured. Using this with the radioactive material's half-life, the age can be estimated. c. The amount of decay material is measured. Using this with the radioactive material's half-life, the age can be estimated. d. The amount of heat generated by radioactive dating is measured to determine age.
A person with normal eyesight uses a converging lens of focal length 10 cm. He holds the lens close to his eye to finish an engraving job. At what distance from the job he must hold the lens?
A) -7.1 cm B) 7.1 cm C) -30 cm D) 30 cm E) 20 cm
Which of the following is a consequence of Hubble's Law?
A) The more distant a galaxy is from us, the faster it moves away from us. B) The closer a galaxy is to us, the faster it moves away from us. C) All galaxies are moving away from us equally fast. D) More distant galaxies appear younger. E) The Big Bang
A uniform rod of length (L = 2.0 m) and mass (M = 1.5 kg) is pivoted about a horizontal frictionless pin through one end. The rod is released from rest at an angle of 30° below the horizontal. What is the angular speed of the rod when it passes through the vertical position? (The rotational inertia of the rod about the pin is 2.0 kg/m2.)
a. 3.5 rad/s b. 2.7 rad/s c. 3.1 rad/s d. 2.3 rad/s e. 1.6 rad/s