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?


Physics & Space Science

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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?

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science