A starship navigator measures the distance between the Earth and the Sun. If the ship is moving at a speed of 0.90c, instead of obtaining 93 million miles, the navigator measures a distance (in millions of miles) of
a. 41.
b. 30.
c. 80.
d. 215.
e. 90.
a
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Radioactive Decay: Two radioactive isotopes, X and Y, both decay to stable products. The half-life of X is about a day, while that of Y is about a week. Suppose a radioactive sample consists of a mixture of these two nuclides. If the mixture is such that the activities arising from X and Y are initially equal, then a few days later the activity of the sample will be due
A. predominantly to Y. B. predominantly to X. C. entirely to Y. D. to X and Y equally.
One mole of an ideal gas is held at a constant volume of 1 liter. Find the change in pressure if the temperature increases by 50°C
a. 3 atm b. 4 atm c. 2 atm d. 1 atm e. 5 atm
Water that does not infiltrate into the ground or evaporate becomes
A) groundwater. B) runoff. C) soil moisture. D) hydrologic cycle.
A cart maintains a constant velocity of 100 m/s for 10 seconds. During this interval its acceleration is
A) zero. B) 1 m/s2. C) 10 m/s2. D) none of the above