Solenoid #1 has a length L, cross-sectional area A, and N turns. Solenoid #2 has a length 2L, cross-sectional area 2A, and 2N turns. Which long solenoid has the greater magnetic field at its center when equal currents are going through them?
a. Both have the same magnetic field. b. #1
c. #2
d. Since it depends on the values of A and L, none of the above are correct.
A
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A) speed up. B) slow down. C) fluctuate. D) Gravity has no measurable effect on time.
The average distance from Earth to the Sun is about _____
A) 23 million miles B) 53 million miles C) 73 million miles D) 93 million miles
A binary star is a pair of stars that orbit around each other. By detecting this orbital motion, and using Kepler's laws and the law of gravitation, one can directly measure the stars' ________.
A. temperatures B. masses C. luminosities D. distances
Latent Heats: A 771.0-kg copper bar is put into a smelter for melting. The initial temperature of the copper is 300.0 K. How much heat must the smelter produce to completely melt the copper bar? The specific heat for copper is 386 J/kg ? K, the heat of fusion for copper is 205,000 J/kg, and its melting point is 1357 K.
A. 4.73 × 105 kJ B. 3.15 × 1011 kJ C. 3.15 × 108 kJ D. 5.62 × 105 kJ