The position of an air-track cart that is oscillating on a spring is given by the equation
x = (12.4 cm) cos[(6.35 s-1)t]. At what value of t after t = 0.00 s is the cart first located at x = 8.47 cm?
A) 4.34 s
B) 0.108 s
C) 0.129 s
D) 7.39 s
E) 7.75 s
C
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Snell's Law: A thin beam of light enters a thick plastic sheet from air at an angle of 32.0° with the normal and continues in the sheet at an angle of 23.0° with the normal. What is the index of refraction of the plastic?
A. 0.74 B. 1.11 C. 1.28 D. 1.36
What is the best reason to put a visible-light telescope in space instead of on the ground?
A) The telescope is above the atmosphere so the light does not get distorted by turbulent air. B) A space telescope is closer to the source of the light, so it can make a clearer image. C) Space telescopes are not affected by earthquakes. D) It is easier to launch very large space telescopes into space than to find places for them on the ground.
What is the purpose of the lab, the importance of the topic, and the question you are trying to answer?
What will be an ideal response?
The diameter of an atom is 1.4 × 10-10 m and the diameter of its nucleus is 1.0 × 10-14 m. What fraction of the atom's volume is occupied by its nucleus?
A) 3.6 × 10-13 B) 7.1 × 10-5 C) 5.1 × 10-9 D) 2.6 × 10-17