Which of the following mechanisms can change the half-life of radioactive nuclei?
A. Extreme high pressure
B. Increasing the number of nuclei in the sample
C. Extreme high temperature
D. None of these choices are correct
Answer: D
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The Bacteria Chloroflexus live in live in lakes, rivers, hot springs, and aquatic environments with very high salt contents. They obtain energy from the Sun and carbon from other bacteria. Given this, they can be classified metabolicaly as
A) photoheterotrophs B) chemoautotrophs C) chemoheterotrophs D) photoautotrophs
A uniform rod (mass = 2.0 kg, length = 0.60 m) is free to rotate about a frictionless pivot at one end. The rod is released from rest in the horizontal position. What is the magnitude of the angular acceleration of the rod at the instant it is 60° below the horizontal?
a. 15 rad/s2 b. 12 rad/s2 c. 18 rad/s2 d. 29 rad/s2 e. 23 rad/s2
Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline. The acceleration down the incline is 1.00 
and the velocity is down the incline. The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. The coefficient of kinetic friction is 0.200. The force F is
A. 771 N. B. 875 N. C. 1,050 N. D. 1,960 N. E. 2,330 N.
Earth's magnetic field:
A) prevents charged particles in the solar wind from reaching the surface. B) is a remnant of the solar nebula's magnetic field. C) is weakening the Van Allen radiation belts. D) is the force behind plate tectonics. E) lines intersect the atmosphere at the equator.