At least 50 percent of the stars in the Orion nebula are encircled by dense disks of gas and dust with more than enough mass to make planetary systems like ours
Indicate whether the statement is true or false
True
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The strong nuclear force is the force that holds the protons and neutrons in the nucleus together
Based on the fact that atomic nuclei can be stable, briefly explain how you can conclude that the strong force must be even stronger than the electromagnetic force, at least over very short distances.
A paint pigment that absorbs red light and gives off blue light
A) is fluorescent. B) is phosphorescent. C) is used in lasers. D) is polarized. E) doesn't exist.
The number of cycles of a wave passing a point per unit time is the wave's __________
Fill in the blank(s) with correct word
A geologist suspends a 0.30-kg stone on an ideal spring. In equilibrium the stone stretches the spring 2.0 cm downward
The stone is then pulled an additional distance of 1.0 cm down and released from rest. (a) Write down the equation for the vertical position y of the stone as a function of time t, using the cosine function. Take the origin at the equilibrium point of the stone, with the positive y direction upward. (b) How fast is the stone moving at a time equal to 1/3 of its period of motion?