Total Internal Reflection: During the investigation of a new type of optical fiber having an index of refraction n = 1.21, a laser beam is aimed at the flat end of a straight fiber, as shown in the figure. What is the maximum angle of incidence ?1 if the beam is not to escape from the sides of the fiber if it is surrounded by air?
A. 42.9°
B. 39.8°
C. 36.7°
D. 33.6°
E. 30.5°
Answer: A
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a. centuries b. decades c. a year d. a few months e. short brief periods
Buoyancy: Salt water has greater density than fresh water. A boat floats in both fresh water and in salt water. Where is the buoyant force greater on the boat?
A. in salt water B. in fresh water C. The buoyant force is the same in both cases.
A 3.0-kg and a 5.0-kg box rest side-by-side on a perfectly smooth, level floor. A horizontal force of 32 N is applied to the 3.0-kg box pushing it against the 5.0-kg box, and, as a result, both boxes slide along the floor
How hard do the two boxes push against each other? A) 12 N B) 20 N C) 24 N D) 32 N E) 0 N
If an unbalanced force of 8 N force acts on a 7-kg object, what is its acceleration?
a. 56 m/s2 b. 1.1 m/s2 c. 0.88 m/s2 d. 15 m/s2 e. cannot be determined