A current may be induced in a coil by
a. moving one end of a bar magnet through the coil.
b. moving the coil toward one end of the bar magnet.
c. holding the coil near a second coil while the electric current in the second coil is increasing.
d. all of the above.
e. none of the above.
d
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Pyrex glass disks, 4 cm thick and 10 cm diameter at 1800ºC, are cooled in air at 30ºC for 5 minutes. The convective heat transfer coefficient is 10 W/m^2K and the Pyrex density is 2225 kg/m^3, thermal conductivity is 1.4 W/mK, and specific heat is 835 J/kgK. The maximum temperature difference through the pyrex must be less than 200ºC/cm. Determine what this is and make any recommendations.
What will be an ideal response?
There are more large spiral galaxies than there are large elliptical galaxies
Indicate whether the statement is true or false
Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. What is their separation after the heavier astronaut has moved 12 m?
A) 9.0 m B) 16 m C) 21 m D) 24 m E) 28 m
A camera with a 50.0 mm lens is designed to focus from 1.00 m to infinity. What is the distance of travel of the lens with respect to the film plane over this range of focus?
A. 50.0 mm B. 52.6 mm C. 47.4 mm D. 5.30 mm E. 2.60 mm