Two thin layers of material with different indices of refraction are coated on a glass plate. The outer first material has n1 = 1.461, the inner second material has n2 = 1.544, and the glass has nglass = 1.62 . If light is incident from air on the first layer, what is the phase change for light that reflects from the glass?
a. 180°
b. 0°
c. 360°
d. 540°
e. 720°
b
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An object of mass m with a certain initial speed on a horizontal surface comes to rest after traveling a distance of 10 m
If the coefficient of kinetic friction between the object and the horizontal surface is 0.20, what is the initial speed of the object? Use g = 10 m/s2. A) 9.8 m/s B) 6.3 m/s C) 3.6 m/s D) 7.2 m/s E) 8.9 m/s
Statistical evidence
a. can be used to draw conclusions about a specific cases. b. is applicable to classes of objects where only a few objects from the class have been studied. c. allows scientists to determine the mechanism that produces the dust ring in Centaurus A. d. allows scientists to deduce general characteristics about a class of objects with similar properties. e. provides insight into the behavior of an individual object based on careful observations of it.
A mass 
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 m1 is 1.00 kg, 
is 2.00 kg, and M is 4.00 kg, then what is the tension in the string attached to 
?
A. 3.92 
B. 3.65
C. 3.23
D. 3.02
E. 2.98
Spherical particles of density 2.0 g/cm3 are shaken in a container of water (viscosity = 1.0 × 10^?3 N/s/m3). The water is 9.0 cm deep and is allowed to stand for 25 minutes. What is the greatest terminal velocity of the particles still in suspension at that time?
a. 3.0E–5 m/s b. 4.5E–5 m/s c. 7.5E–5 m/s d. 6.0E–5 m/s e. 8.4E–5 m/s