What is the magnetic force on a 2.0-m length of (straight) wire carrying a current of 30 A in a region where a uniform magnetic field has a magnitude of 55 mT and is directed at an angle of 20° away from the wire?
A. 1.5 N
B. 1.3 N
C. 1.1 N
D. 1.7 N
E. 3.1 N
Answer: C
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Total Internal Reflection: A light ray enters a glass enclosed fish tank. From air it enters the glass at 20° with respect to the plane of the surface and then emerges into the water. The index for the glass is 1.50 and for water 1.33.(a) What is the angle of refraction in the glass?(b) What is the angle of refraction in the water?(c) Is there any incident angle in air for which the ray will not enter the water due to total internal reflection? If so, find it.
What will be an ideal response?
Two masses are connected by a cord that passes over a pulley as shown in the figure. The pulley and the cord have negligible mass and 
(6.0 kg) moves on a horizontal surface with a coefficient of friction of 0.5, 
(2.0 kg) is suspended vertically. What is the acceleration of 
?
A. 0.0 
B. 3.0
C. 1.0
D. 2.9
In the context of the magnitude scale, the larger the magnitude number of a star, _____
A) the older the star is B) the fainter the star is C) the closer the star is D) the brighter the star is
The Moon always keeps the same side facing Earth and therefore Earth always keeps the same side facing the Moon
a. True b. False Indicate whether the statement is true or false