Most of the energy emitted by a pulsar _____
a. is carried away as a ‘pulsar wind' of high-speed atomic particles
b. produces strong gravitational waves that radiate for several light years
c. ionizes the supernova remnant around the pulsar
d. is in the form of neutrinos
e. is carried away by the high-energy beam emerging from the poles of the pulsar
a
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In the conventional scenario, during phase of planet formation caused the jovian planets to form?
A) core-accretion B) fragmentation C) differentiation D) collision E) condensation
The volume of an ideal gas changes from 0.40 to 0.51 m3 although its pressure remains constant at 52 000 Pa. What work is done on the system by its environment?
a. 5.7E+3 J b. –5.7E+3 J c. –2.1E+4 J d. 2.1E+4 J e. –2.7E+4 J
Two uncharged metal spheres, #1 and #2, are mounted on insulating support rods. A third metal sphere, carrying a positive charge, is then placed near #2. Now a copper wire is momentarily connected between #1 and #2 and then removed
Finally, sphere #3 is removed. In this final state A) spheres #1 and #2 are still uncharged. B) sphere #1 carries positive charge and #2 carries negative charge. C) sphere #1 carries negative charge and #2 carries positive charge. D) spheres #1 and #2 both carry positive charge. E) spheres #1 and #2 both carry negative charge.
A small town has decided to forego the use of electrical power and send energy through town via mechanical waves on ropes
They use rope with a mass per length of 1.50 kg/m under 6000 N tension. If they are limited to a wave amplitude of 0.500 m, what must be the frequency of waves necessary to transmit power at the average rate of 2.00 kW? A) 24.8 Hz B) 169 Hz C) 60.0 Hz D) 2.07 Hz E) 2.00 kHz