A glass plate whose index of refraction is 1.57 is immersed in a liquid. The surface of the glass is inclined at an angle of 54° with the vertical. A horizontal ray in the glass is incident on the interface
The liquid is an oil whose index of refraction is 1.40. The incident horizontal ray refracts at the interface. The angle that the refracted ray, in the oil, makes with the horizontal is closest to: A) 11°
B) 5.6°
C) 8.3°
D) 14°
E) 17°
A
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Springs: A heavy dart and a light dart are launched horizontally on a frictionless table by identical ideal springs. Both springs were initially compressed by the same amount. Which of the following statements about these darts are correct? (There could be more than one correct choice.)
A. The darts both have the same kinetic energy just as they move free of the spring. B. The lighter dart leaves the spring moving faster than the heavy dart. C. The heavy dart had more initial elastic potential energy than the light dart. D. Both darts move free of the spring with the same speed. E. Both darts had the same initial elastic potential energy.
An AC series circuit has 16.5 ? resistance, 12.8 ? inductive reactance and 8.27 ? capacitive reactance. If an effective (rms) emf of 145 V is applied, what is the effective (rms) current value?
a. 7.56 A b. 8.47 A c. 0.495 A d. 23.7 A e. 6.89 A
The first law of thermodynamics is basically a special version of the law of ______________
Fill in the blank(s) with correct word
If two adjacent frequencies of an organ pipe closed at one end are 385 Hz and 578 Hz, what is the length of the organ pipe? (vsound = 340 m/s)
a. 0.44 m b. 0.59 m c. 1.4 m d. 0.88 m e. 1.8 m