A third apparent visual magnitude star is brighter than a fifth apparent visual magnitude star
a. True
b. False
Indicate whether the statement is true or false
True
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Equilibrium: A light board that is 10 m long is supported by two sawhorses, one at one end of the board and a second at the midpoint. A 40-N object is placed between the two sawhorses, 3.0 m from the end and 2.0 m from the center. A second object, with a weight of 15 N, is placed on the supported end. What magnitude forces do the sawhorses exert on the board?
What will be an ideal response?
How are elements beyond iron formed in massive-star supernovae?
A) Elements thrown out at high speeds fuse with hydrogen atoms in the interstellar medium. B) Neutrons produced during the core collapse are slammed into atomic nuclei. C) The high temperature and pressure allow iron nuclei to fuse.
Leptons can interact by which of the following forces?
A) strong nuclear force, weak nuclear force, electromagnetic force, gravitation B) strong nuclear force, weak nuclear force, electromagnetic force C) weak nuclear force, electromagnetic force, gravitation D) strong nuclear force, weak nuclear force E) strong nuclear force, electromagnetic force, gravitation
Trilobites lived during which era?
a. Paleozoic b. Cenozoic c. Mesozoic d. Archeozoic