A resistor with a resistance of 360 ? is in a series circuit with a capacitor of capacitance 7.3 × 10-6 F
What capacitance must be placed in parallel with the original capacitance to change the capacitive time constant of the combination to three times its original value?
15 × 10-6 F
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Rich galactic clusters ____
a. are rare, because galaxies are usually isolated in space b. contain gas that is rich in metals c. are composed of mostly elliptical galaxies d. are very spread out, without a defined center e. contain a wide variety of galaxy types and sizes
Momentum: Find the magnitude and direction of the net momentum of the system shown in the figure. Express the direction by giving the angle the net momentum makes with the +x-axis.
Fill in the blank(s) with the appropriate word(s).
According to the microwave background radiation Earth is:
A) at the center of the universe. B) near the location of the Big Bang. C) in no special location in the universe. D) in a part of the universe that is just like any other part. E) moving at about 380 km/s toward Leo.
Captain Jirk reports to headquarters that he left the planet Senesca 1.88 × 10^4 seconds earlier. Headquarters sends back the message: "Was that spaceship proper time?" It will be spaceship proper time if it was
a. measured by one clock fixed at one spot on Senesca. b. measured by one clock fixed at one spot on the spaceship. c. measured by a clock on Senesca at departure and by a clock on the spaceship when reporting. d. measured by a clock on the spaceship when departing and by a clock on Senesca when reporting. e. calculated by dividing the distance from Senesca according to Senesca by the speed of the spaceship.