An electron moves in a region where the magnetic field is uniform and has a magnitude of 80 ?T. The electron follows a helical path which has a pitch of 9.0 mm and a radius of 2.0 mm. What is the speed of this electron as it moves in this region?
a. 48 km/s
b. 28 km/s
c. 20 km/s
d. 35 km/s
e. 8.0 km/s
d
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In the unified model of active galactic nuclei, the broad line region in an active galactic nucleus is
a. composed of clouds of gas and stars moving at very high orbital velocities near a supermassive black hole. b. composed of a supermassive black hole surrounded by empty space. c. responsible for producing the bright continuous radiation from within the event horizon. d. responsible for the narrow absorption lines seen in Type 2 Seyfert galaxies. e. located far from the core beyond the disk of stars of the galaxy.
Loops of glowing hydrogen seen hanging over the solar limb during totality are:
A) solar rainbows. B) haloes. C) prominences. D) filaments. E) flares.
Terminal Voltage and Internal Resistance: A circuit contains two batteries and a 2.0-? resistor as shown in the figure. The emfs and internal resistances of these batteries are indicated in the figure, and all numbers are accurate to two significant figures. What are the terminal voltages of (a) the 6.0-V battery and (b) the 12-V battery?
What will be an ideal response?
Choose the correct explanation why does the statement make sense (or is clearly true) or does not make sense (or is clearly false): NASA will soon launch a spaceship that will photograph our Milky Way Galaxy from beyond its halo.
A. The statement doesn't make sense. NASA need to build a spaceship that able to travel close to the speed of light to get into the halo of Milky Way in reasonable time, such as hundred years. it's well beyond the current technology. B. The statement doesn't make sense. Even if NASA could build a spaceship that traveled close to the speed of light, it would take tens of thousands of years to get into the halo and then the same time for image to get back to Earth. C. The statement doesn't make sense. At the speed of the current spaceships, it would take tens of thousands of years to get into the halo of Milky Way, though reasonable time, such as hundred years, is needed for image to get back to Earth. D. The statement makes sense. If NASA can build a spaceship that will travel close the speed of light, it would take reasonable time, such as hundred years, to get into the halo to photograph the disk, and the same time for image to get back to Earth.