A 0.20-kg object is oscillating on a spring with a spring constant of k = 30 N/m. What is the potential energy of the system when the object's displacement is 0.040 m, exactly half the maximum amplitude?
a. 0.96 J
c. 0.012 J
b. 0.024 J
d. zero
B
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In a Hertzsprung-Russell (H-R) diagram, points near the top of the diagram represent very low luminosity stars and points near the bottom represent very luminous stars
Indicate whether the statement is true or false
Which of the following statements best explains why the densities of Uranus and Neptune are higher than that of Saturn, even though Saturn is much more massive?
a They have higher masses. b. They have a higher proportion of hydrogen compounds and rock. c. They have stronger magnetic fields. d. They are at greater distances from the Sun. e. Their interiors are more compressed due to stronger gravity.
Most astronomers agree to interpret ________ Law to mean that the present day universe is expanding
Fill in the blank(s) with correct word
Which radiation has no association with electric charge?
A) alpha B) beta C) gamma D) all of the above E) none of the above