Thin Films: When a light wave enters into a medium of different refractive index,
A. only its speed and frequency change.
B. only its speed and wavelength change.
C. only its frequency and wavelength change.
D. its speed, frequency, and wavelength change.
Answer: B
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A mass src="https://sciemce.com/media/4/4c4b9bc146291b8f34.png" class="w-image" />?
is connected by a light string that passes over a pulley of mass M to a mass 
sliding on a frictionless horizontal surface as shown in the figure. There is no slippage between the string and the pulley. The pulley has a radius of 25.0 cm and a moment of inertia of 1?2 
If 
is 4.00 kg, 
is 4.00 kg, and M is 4.00 kg, then what is the tension in the string attached to
A. 35.6 N
B. 32.7 N
C. 31.0 N
D. 29.0 N
E. 23.5 N
Image height divided by object height gives __________
Fill in the blank(s) with correct word
Liquid crystals have the useful property that
A. they are very strong in one direction but very weak in another. B. their transparency can be changed by applying an electric field. C. they can behave like liquid semiconductors and make computers more flexible. D. they can change from a liquid state to a solid state instantly.
What is "uniform motion?"
a. smooth motion b. motion with zero acceleration c. motion with constant velocity d. motion at a constant speed e. motion along a straight path