A solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field near the center of the solenoid? (?0 = 4? × 10-7 T • m/
A)
A) 16 mT
B) 4.9 mT
C) 15 mT
D) 6.0 mT
E) 9.0 mT
C
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The surface temperature of the star is 6000 K. At what wavelength is its light output a maximum? The constant in Wien's law is 0.00290 m ? K
A) 850 nm B) 907 nm C) 311 nm D) 483 nm E) 502 nm
What evidence supports the contention that the strong nuclear force is stronger than the electrical interaction at short inter-nuclear distances?
A) Protons are able to exist side-by-side within an atomic nucleus. B) Neutrons spontaneously decay into protons and electrons. C) Uranium deposits are always slightly warmer than their immediate surroundings. D) The radio interference that arises adjacent to any radioactive source.
A spaceship of mass 106 kg is to be accelerated to 0.60c. How much energy does this require?
a. 2.3 × 10^22 J c. 2.5 × 10^23 J b. 6.0 × 10^22 J d. 1.5 × 10^23 J
When you see the bright flash of a meteor, what are you actually seeing?
A) emission of visible light from a particle that has not yet entered Earth's atmosphere B) the glow from a pea-size particle and the surrounding air as the particle burns up in our atmosphere C) a star that has suddenly shot across the sky D) the flash that occurs when a speeding rock from space hits the ground