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The sun is the only star whose size we can easily measure directly; astronomers therefore estimate the sizes of other stars using Stefan's law.
(a) The spectrum of Sirius A, plotted as a function of energy, peaks at a photon energy of 2.4 eV, while Sirius A is approximately 24 times as luminous as the sun. How does the radius of Sirius A compare to the sun's radius?
(b) Sirius B, the companion of Sirius A (see Figure), is only 3% as luminous as the sun. Its spectrum, plotted as a function of energy, peaks at about 7 eV. Howdoes its radius compare to that of the sun?
(c) The spectrum of the star Betelgeuse, plotted as a function of energy, peaks at a photon energy of 0.8 eV, while Betelgeuse is approximately 10,000 times as luminous as the sun. How does the radius of Betelgeuse compare to the sun's radius? Why is Betelgeuse called a "red supergiant"?
A toboggan approaches a snowy hill moving at 14.8m/s, Find the acceleration of the toboggan as it is going up the hill
write down the decay process for carbon-10. calculate the change in energy for the reaction?
A ball is thrown directly upward with an initial velocity of 10 m/s. how long is the ball in the air
If you were to send a beam of laser light to a space station above an atmosphere and just above the horizon, would you aim the laser above, below or at the visible space station.
for a certain transverse wave the distance between two successive crests is 1.20 m and eight crests pass a given point
How long does it take for ice to grow to a thickness of 4cm on apond on a windy night when the air temperature is -6 degreecelsius. Assume the surface ice is maintained at a temperature of -6degree celsius.
What is the shortest height a plane mirror must be so that a person who is 1.6 meters tall is able to see his or her whole body? plan a ray diagram to support your answer.
You plan to fly a model airplane of mass 0.390 kg that is attached to a horizontal string. The plane will travel in a horizontal circle of radius 5.90 m. Find the speed at which you must fly the plane
question1mainly cars have a speedometer odometer and a clock.a illustrate how you might use these devices to determine
Two light bulbs are 1.0 m apart. From what distance can these light bulbs be marginally resolved by a small telescope with a 4.0 cm diameter objective lens
A 0.9 inch tall clock is 24 cm in front of a diverging lens which has a focal length of -33.5 cm. Paying attention to sign, answer the following questions. a. What is the image distance? cm b. What is the image's height?
A scuba diver releases a 3.60 cm diameter (spherical) bubble of air from a depth of 13.0 m in a lake. Suppose the temperature is constant at 298 K, and the air behaves as a perfect gas. How large is the bubble when it reaches the surface?
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