The radiation from cell phones
A. does not cause cancer
B. causes cancer, but not enough to worry
C. causes over 1 % of the cancer in those who use them
D. protects users from cosmic rays
Answer: A. does not cause cancer
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Magnetic Field of a Long Wire: The magnetic field due to the current in a long, straight wire is 8.0 ?T at a distance of 4.0 cm from the center of the wire. What is the current in the wire? (?0 = 4? × 10-7 T ? m/A)
A. 0.20 A B. 0.40 A C. 0.80 A D. 3.2 A E. 1.6 A
Beyond the formation of iron, nuclear energy can be produced only by:
A) fusion of still heavier elements. B) ionization of the radioactive nuclei. C) fission of heavy nuclei back toward lighter ones. D) gravity. E) the dark force.
Suppose that an object is moving with constant acceleration. Which of the following is an accurate statement concerning its motion?
A) In equal times its speed increases by equal amounts. B) In equal times its velocity changes by equal amounts. C) In equal times it moves equal distances.
What are possible reasons that galaxies differ in form?
A.) Pre-galactic clouds have different densities. B.) Pre-galactic clouds have different rotation rates. C.) Galaxies collide with one another, creating different types. D.) All of the above. E.) A and B.