A segment of wire carries a current of 25 A along the x axis from x = ?2.0 m to x = 0 and then along the y axis from y = 0 to y = 3.0 m. In this region of space, the magnetic field is equal to 40 mT in the positive z direction. What is the magnitude of the force on this segment of wire?
a. 2.0 N
b. 5.0 N
c. 1.0 N
d. 3.6 N
e. 3.0 N
d
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There is a main-sequence mass-luminosity relation because
a. helium fusion produces carbon. b. stars expand when they become giants. c. more massive stars support their larger weight by making more energy. d. the helium flash occurs in degenerate matter. e. all stars on the main sequence have about the same radius.
A magician can make a candle look as if it is burning under water by focusing light from a candle flame burning in air directly on top of an underwater candle. To do this you want to use a (Hint: eliminate those that cannot work.)
A. concave mirror farther than one focal length from the burning candle. B. a convex mirror farther than one focal length from the burning candle. C. a biconcave lens farther than one focal length from the burning candle. D. a concave mirror closer than one focal length to the burning candle. E. a convex lens closer than one focal length to the burning candle.
A true statement about the modern theory of light is that
A. light waves do not carry energy but photons can. B. light can behave like a wave or a particle depending on the situation. C. light can only behave like a particle in atoms. D. photons do not have a frequency.
A very light 1.00-m wire consists of two segments of equal length, one of steel (Young's modulus is 2.00 × 1011 N/m2 )
and one of brass (Young's modulus is 9.0 × 1010 N/m2 ). The steel segment is 1.50 mm in diameter, and the brass segment has twice this diameter. When a weight w is hung from the ceiling by this wire, the steel segment stretches by 1.10 mm. Find the weight w. A) 190 N B) 390 N C) 780 N D) 1000 N E) 3100 N