Two very flat glass plates, 16 cm long, are in contact at one end and separated by 0.020 mm at the other end
The space between the plates is occupied by oil with index of refraction 1.45. The refractive index of the glass plates is 1.55. The plates are illuminated at normal incidence with monochromatic light, and fringes are observed. When the monochromatic light has a wavelength of 580 nm, how many bright fringes are visible in the pattern?
A) 60
B) 70
C) 80
D) 90
E) 100
E
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A uniform, horizontal beam of length 8.0 m and weight 42.4 N is attached at one end to a wall by a pin connection (so that it may rotate). A cable attached to the wall above the pin supports the opposite end. The cable makes an angle of 60.0° with the horizontal. What is the tension in the cable needed to maintain the beam in equilibrium?
a. 24.5 N b. 49.0 N c. 294 N d. 4.59 N e. 171 N
The plastic-like substratum on which the lithospheric plates move is called the
a. outer core. b. endosphere. c. isosphere. d. asthenosphere.
A potter's wheel with a moment of inertia of 8.0 kg-m2 has 5.0 N-m applied to it. It starts from rest. 10. s later it has gained what kinetic energy?
A) 44. J B) 0.12 kJ C) 78. J D) 1.6 kJ E) 53. J
Two thermometers are calibrated, one in degrees Celsius and the other in degrees Fahrenheit. At what temperature (in kelvins) do their readings measure the same temperature?
A. 218.15 B. 233.15 C. 273.15 D. 40.15 E. 0