The magnetic permeability of a ferromagnetic material is
A)
much less than ?O.
B)
slightly less than ?O.
C)
much greater than ?O.
D)
the same as ?O.
E)
slightly more than ?O.
C
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Light precedes through three polarizing sheets. Unpolarized light enters the 1st sheet and the resultant vertically polarized beam continues through the 2nd and 3rd
The 2nd sheet has its transmission axis at 50.° with respect to the 1st, and the 3rd is at 70.° with respect to the 1st. (a) What percent of the original intensity emerges from filter #1? (b) What percent of the original intensity emerges from filter #2? (c) What percent of the original intensity emerges from filter #3? (d) If filter #2 has its transmission axis changed to 30.°, what % intensity now emerges from the 3rd filter?
A heat engine absorbs 64 kcal of heat each cycle and exhausts 42 kcal
(a) Calculate the efficiency each cycle. (b) Calculate the work done each cycle.
A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns to the starting point. If the student swims with respect to the water at a constant speed and the downstream portion of the swim requires 20 minutes, how much time is required for the entire swim?
a. 50 minutes b. 80 minutes c. 90 minutes d. 70 minutes e. 60 minutes
An object is moving forward with a constant velocity. Which statement about this object MUST be true?
A) The net force on the object is zero. B) The net force on the object is in the forward direction. C) No forces are acting on the object. D) The acceleration of the object is in the forward direction.