A solenoid must be produced that has a magnetic flux density of 25,000 T. The coil for the solenoid has 200 loops in a distance of 1 cm, and the maximum current for the wire is 1A. Select a suitable material for this solenoid from the materials listed. For this design, performance is more important than cost.
What will be an ideal response?
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The average heat transfer per unit area is 100 W/m2 between saturated vapor R-134a and a tube. The R-134a is at 50ºC and flows at 0.5 kg/s through a 1-cm-diameter horizontal tube having average surface temperature of 20ºC. The R-134a is to be completely condensed when it leaves the tube. Estimate the tube length required, using hnfg = 205.9 kJ/kg for R-134a at 500C.
What will be an ideal response?
Two planets having equal masses are in circular orbit around a star. Planet A has a smaller orbital radius than planet B. Which statement is true?
A) Planet A has more kinetic energy, more potential energy, and more mechanical energy (potential plus kinetic) than planet B. B) Planet A has more kinetic energy, less potential energy, and less mechanical energy (potential plus kinetic) than planet B. C) Planet A and planet B have the same amount of mechanical energy (potential plus kinetic). D) Planet A has more kinetic energy, less potential energy, and more mechanical energy (potential plus kinetic) than planet B.
Which of the following scenarios involves energy that we would typically calculate with Einstein's formula E=mc2?
A) A small amount of the hydrogen in of a nuclear bomb becomes energy as fusion converts the hydrogen to helium. B) An object accelerated to a great speed has a lot of kinetic energy. C) A mass raised to a great height has a lot of gravitational potential energy. D) A burning piece of wood produces light and heat, therefore giving off radiative and thermal energy.
What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the ni = 2 to the nf = 1 state?
A) 205.2 nm B) 87.5 nm C) 91.2 nm D) 121.5 nm E) 402.1 nm