What information can we get from eclipsing binaries that we cannot get from visual binaries?
What will be an ideal response?
Because the orbital plane of eclipsing binaries is edge on from our viewpoint, we can determine the true orbital velocity, and hence the size of the orbits and the masses of the stars.
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A Sun-like star will experience a helium flash in the core if
a. it is less massive than about 3 solar masses. b. it has become a red giant star. c. it has formed a helium core. d. the material in the core has gradually become degenerate. e. All of the other choices are correct.
The circuit below contains three 100-W light bulbs and a capacitor. The emf is 110 V and the capacitor is fully charged. Which light bulb(s) is(are) brightest?
A. A B. B C. C D. A and B E. A and C
A car with good tires on a dry road can decelerate at about 5.0 m/s2 when braking. Suppose a car is initially traveling at 55 mi/h
(a.) How much time does it take the car to stop? (b.) What is the stopping distance?
Compact fluorescent bulbs typically last 10 years while incandescent bulbs last about 1 year
For a given amount of light, a tungsten bulb draws 100 W and a compact fluorescent bulb draws 15 W. If the cost of electricity is $0.10/kWh, how long would you have to operate a compact fluorescent bulb to save $5.00 compared to the costs of operating a tungsten bulb?