Snell's Law: A beam of light in water (of refractive index of 1.33) enters a glass slab (of refractive index 1.50) at an angle of incidence of 60.0°. What is the angle of refraction in the glass?
A. 27.5°
B. 39.8°
C. 60.0°
D. 90.0°
E. 50.2°
Answer: E
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The third step in the precipitation-hardening process is to _________ the alloy to form the precipitate.
Fill in the blank(s) with the appropriate word(s).
Young's Modulus: A 7.0-kg pipe is hung from a steel wire that is 2.5 m long and has a diameter of 0.75 mm. Young's modulus for steel is 2.0 × 1011 N/m2.(a) By what distance does the wire stretch?(b) If the wire diameter were doubled, what would be the stretch?
What will be an ideal response?
Which of the following best explains why nuclear fusion requires bringing nuclei extremely close together?
A) Fusion can only proceed by the proton-proton chain and therefore requires that protons come close enough together to be linked up into a chain. B) Nuclei have to be very hot in order to fuse, and the only way to get them hot is to bring them close together. C) Nuclei normally repel because they are all positively charged and can be made to stick only when brought close enough for the strong force to take hold. D) Nuclei are attracted to each other by the electromagnetic force, but this force is only strong enough to make nuclei stick when they are very close together.
A 2.0 g bead slides along a frictionless wire, as shown in the figure. At point A, the bead is moving to the right but with negligible speed
(a) What is the potential energy of the bead at point A? (b) What is the kinetic energy of the bead at point B? (c) What is the speed of the bead at point B? (d) What is the speed of the bead at point C? What will be an ideal response?