The critical angle for glass in air if the glass has index of refraction 1.50 is
A) 41.8°.
B) 85.9°.
C) 56.3°.
D) 90°.
E) 48.1°.
A
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When a glass rod is rubbed with silk, which of the following statements best describes what happens?
a. Electrons are removed from the rod. b. Protons are removed from the silk. c. The silk is charged positively. d. The silk remains neutral.
A carbon atom with six protons, seven neutrons, and five electrons has
Constant Angular Acceleration: A machinist turns on the power to a grinding wheel at time t = 0 s. The wheel accelerates uniformly from rest for 10 s and reaches the operating angular speed of 38 rad/s. The wheel is run at that angular speed for 30 s and then power is shut off. The wheel slows down uniformly at 2.1 rad/s2 until the wheel stops. In this situation, what is the angular acceleration of the wheel between t = 0 s and t = 10 s?
A. 3.8 rad/s2 B. 4.6 rad/s2 C. 5.3 rad/s2 D. 6.1 rad/s2 E. 6.8 rad/s2
When subtracting several quantities, the number of decimal places in the result must always be
A) larger than the number of decimal places in the most accurate of the quantities. B) equal to the number of decimal places in the most accurate of the quantities. C) equal to the average number of significant digits in the most and least accurate of the quantities. D) equal to the number of decimal places in the least accurate of the quantities. E) smaller than the number of decimal places in the least accurate of the quantities.