An electric motor produces 2.0 hp in a Vrms = 120 V circuit. What is Irms for this motor? (1 hp = 746 W)
a. 12 A
c. 0.62 A
b. 6.2 A
d. 1.6 A
A
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A planet is in orbit around the Sun. The semimajor axis of the orbit is 5 AstronomicalUnits (AU). UseP2=a3to calculate the period of the orbit in years.
a) 5 years b) 0.2 years c) 135 years d) 125 years e) 11.2 years
If an electron is accelerated from rest through a potential difference of 300 V, find its approximate speed at the end of this process. (e = 1.6 × 10^-19 C; me = 9.1 × 10^-31 kg)
a. 2.5 × 10^7 m/s c. 1.0 × 10^7 m/s b. 2.1 × 10^7 m/s d. 1.4 × 10^7 m/s
What is the ultimate fate of an isolated white dwarf?
A) It will cool down and become a cold black dwarf. B) As gravity overwhelms the electron degeneracy pressure, it will explode as a nova. C) As gravity overwhelms the electron degeneracy pressure, it will explode as a supernova. D) As gravity overwhelms the electron degeneracy pressure, it will become a neutron star. E) The electron degeneracy pressure will eventually overwhelm gravity and the white dwarf will slowly evaporate.
Mort observes Velma's light-clock, as Velma passes. He observes that, during a 1 second tick of her clock, her light beam travels
A) 300,000 km. B) a distance of one light year. C) less than 300,000 km. D) further than 300,000 km. E) no distance at all.