The potential energy of a spring is 0.25 J when it is compressed 0.04 m to the left of its equilibrium position. This is its leftmost position. What is its kinetic energy when it returns to the equilibrium point?
A. zero
B. -0.3 J and moving to the left
C. 0.3 J and moving to the right
D. 0.3 J and at rest
Answer: C
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The nucleus of an atom is made up of which of the following?
a. electrons and neutrons c. protons, electrons, and neutrons b. protons and neutrons d. electrons and protons
Why did the era of nucleosynthesis end?
A) Too many heavy elements were produced. B) Neutrinos carried off too much energy. C) The temperature of the universe became too low. D) The density of the universe became too low.
Heat transfer by radiation occurs via
a. electromagnetic waves b. nuclear decay c. molecular collisions d. the solar wind e. none of the above
The outermost planets in our Solar System are Jovian planets
a. True b. False Indicate whether the statement is true or false