Which force is responsible for holding the nucleus together via gluons?

A.) Strong.
B.) Weak.
C.) Electromagnetic.
D.) Gravity.
E.) Photon.


Ans: A.) Strong.

Physics & Space Science

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According to Einstein’s second postulate of special relativity, the velocity of light in a vacuum

A. is the same for all frames of reference B. is too great to be measured C. is the same for all inertial frames of reference D. depends upon the velocity of the source

Physics & Space Science

What is "uniform motion?"

a. smooth motion b. motion with zero acceleration c. motion with constant velocity d. motion at a constant speed e. motion along a straight path

Physics & Space Science

The verdict at the end of the Extraordinary Claims box says “Likely correct, though may never be possible to prove definitively.” In the context of models, which of the following best explains this verdict?

a. A model that precisely reproduces major characteristics of the Moon would seem likely correct, but we can’t go back in time to see that it actually happened that way. b. Models are not reality, and we can never trust their results to reflect what might happen in the real world (or universe). c. No model could ever be good enough to reproduce the major characteristics of the Moon. d. Models are very vague, and cannot be used to make mathematically precise predictions.

Physics & Space Science

One measure of the ductile-to-brittle transition temperature is the temperature where _________percent of the fracture is brittle.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science