Snell's Law: A flashlight beam makes an angle of 60° with the plane of the surface of a calm lake before it enters the water. In the water what angle does the beam make with the plane of the surface? The index of refraction of water is 1.33.
A. 0°
B. 30°
C. 60°
D. 22°
E. 68°
Answer: E
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Each of the following lists two statements. Which two are the basic premises for the special theory of relativity?
A) 1. The laws of nature are the same for everyone. 2. The speed of light is the same for everyone. B) 1. Everything is relative. 2. You can never really tell who is moving. C) 1. You can't go faster than the speed of light. 2. Time is different for different people. D) 1. The laws of nature are the same for everyone. 2. Everything is relative. E) 1. The speed of light is the same for everyone. 2. You can't go faster than the speed of light.
What is the self-inductance of an ideal solenoid that is 300 cm long with a cross-sectional area of 1.00 × 10-4 m2 and has 1000 turns of wire? (?0 = 4? × 10-7 T ? m/A)
A) 4.19 ?H B) 41.9 µH C) 4.19 pH D) 41.9 nH E) 4.19 nH
Define chunked text and explain the importance of writing scannable text for webpages.
What will be an ideal response?
A 0.20-kg mass is oscillating on a spring over a horizontal, frictionless surface. When it is at a displacement of 2.6 cm from equilibrium, it has a kinetic energy of 2.7 J and a spring potential energy of 2.2 J. What is the maximum speed of the mass during its oscillation?
a. 3.7 m/s c. 6.0 m/s b. 4.7 m/s d. 7.0 m/s