Based on everything you have learned about the formation of our solar system, which of the following statements is probably not true?
A) Only a tiny percentage of stars are surrounded by spinning disks of gas during their formation.
B) Planets always tend to orbit their star in the same direction and approximately the same plane.
C) Other solar systems will also have planets in the two basic categories of terrestrial and jovian.
D) Other planetary systems will have far more numerous asteroids and comets than actual planets.
A
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Parallel Wires: Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the magnetic force that each wire exerts on the other?
A. It is doubled. B. It stays the same. C. It is tripled. D. It is quadrupled. E. It is reduced by a factor of two.
An organ pipe closed at one end has a length of 60 centimeters. What is the wavelength of the second harmonic?
A. 20 cm B. 60 cm C. 80 cm D. 100 cm
A rock is thrown straight up with an initial velocity of 25.0 m/s. What maximum height will the rock reach before starting to fall downward? (Take acceleration due to gravity as 9.80 m/s2.)
a. 39.9 m b. 15.9 m c. 63.8 m d. 31.9 m e. 47.8 m
An excited atom can lose energy by emitting a __________
Fill in the blank(s) with correct word