A 63. kg astronaut walks upon the surface of the planet Krypton which has 100. times the mass of the Earth and 100. times the diameter of the Earth. What does she weigh on Krypton?
What will be an ideal response?
63.× 9.8 × 100 /1002 = 6.2 Newtons
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Why can't any star, no matter how massive, fuse elements heavier than iron?
A) because the nucleons within iron have the least mass possible B) because elements heavier than iron have less average mass per nucleon C) It could happen, we just have not yet observed a star massive enough to do this. D) Actually, this occurs on a regular basis, which explains the great abundance of heavy elements. s on a regular basis, which explains the great abundance of heavy
Globular clusters are typically much older than open clusters
Indicate whether the statement is true or false
A commercial jet flies above a region of the earth where the earth’s magnetic field points nearly (a) straight upward, which part of the airplane becomes negatively charged?
A. Its nose B. Its tail C. Its top D. Its bottom E. Its left wing F. Its right wing T. (No part becomes charged.)
Which of the following statements about electromagnetic waves in free space are true? (There could be more than one correct choice.)
A) The higher-frequency waves have shorter wavelengths than the lower-frequency waves. B) The higher-frequency travel faster than the lower-frequency waves. C) The wavelengths of the visible waves are some of the longest electromagnetic waves. D) The wavelengths of the visible waves are some of the shortest electromagnetic waves. E) The electric field vector is always at right angles to the magnetic field vector.