Suppose that an object is moving with a constant velocity. Make a statement concerning its acceleration
A) The acceleration must be constantly increasing.
B) The acceleration must be constantly decreasing.
C) The acceleration must be a constant non-zero value.
D) The acceleration must be equal to zero.
E) A statement cannot be made without additional information.
D
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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 the following statement(s) true (T) or false (F)
1. The angular momentum of a particle can be nonzero even if it moves in a straight line. 2. The angular momentum (around a rotating rigid object’s center of mass) of an arbitrary particle in that object points directly along the object’s rotation axis.
What are the advantages in placing the James Webb Space Telescope so far from Earth? Choose all that apply.
A.It will be closer to the objects it seeks to observe. B.There will not be any atmospheric interference. C.Light from the objects it observes will arrive at the telescope more quickly. D.Only a small portion of the sky will be blocked by Earth. E.It is unlikely to be hit by orbiting debris.
During an adiabatic compression, a volume of air decreases to 1/4 its original size. Calculate its final pressure if its original pressure was 1 atm. (Assume the air behaves like an ideal gas with g = 1.4.)
a. 7.0 atm b. 5.6 atm c. 3.5 atm d. 2.2 atm e. 0.14 atm