A 1.0-m length of nichrome wire has a radius of 0.50 mm and a resistivity of 1.0 × 10-6 ? ? m. When this wire carries a current of 0.50 A, what is the voltage across its ends?
A) 0.0030 V
B) 0.32 V
C) 0.64 V
D) 1.6 V
C
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A star like the Sun emits a(n) ____ spectrum
a. absorption b. emission c. continuous d. Doppler e. ionization
Which of the following is not a major idea of Einstein's general theory of relativity?
A) Time runs slower near strong gravitational fields. B) It is possible to travel through wormholes. C) Our universe can have no center or boundaries, yet be finite. D) Black holes can exist in spacetime, and falling into a black hole means leaving the observable universe.
An 800-N man stands at rest with his weight evenly distributed on two bathroom scales. The reading on each scale is
A) 200 N. B) 400 N. C) 800 N. D) 1600 N. E) none of the above
The half-life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is 105 years
a. True b. False Indicate whether the statement is true or false