If the density of the universe is lower than the critical density, this means that:
A) the universe is expanding at a rate equal to the escape speed of the universe.
B) the universe is expanding at a rate less than the escape speed of the universe.
C) the universe is expanding at a rate greater than the escape speed of the universe.
D) the universe is expanding at a rate equal to the speed of light.
E) the universe is expanding at a rate greater than the speed of light.
C
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Resistance and Resistivity: The resistance of a 100-cm wire of cross sectional area 2 × 10-6 m2 is 400 ?. What is the resistivity of the material from which this wire is made?
A. 0.80 × 10-4 ? ? m B. 8.0 × 10-4 ? ? m C. 0.80 × 10-5 ? ? m D. 0.80 × 10-6 ? ? m E. 8.0 × 10-6 ?v
A 2.00 kg pendulum bob on a string 3.00 m long is released with a velocity of 1.00 m/s when the support string makes an angle of 30.0 degrees with the vertical. What is the tension in the string at the highest point of its motion?
A. 30.8 N B. 27.5 N C. 20.1 N D. 16.6 N E. 10.5 N
A molecule has
A) mass. B) structure. C) energy. D) all of the above E) none of the above
If you were to measure your pulse rate while in a spaceship moving away from the sun at a speed close to the speed of light, you would find that it was
A) much faster than normal. B) much slower than normal. C) the same as it was here on Earth.