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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"?
In the two-slit experiment, the distance between the slits and the screen is 1.10 m and the distance between the slits is 0.100 mm. what is the wavelength of light
In order better to map the surface features of the Moon, a 355-kg imaging satellite is put into circular orbit around the Moon at an altitude of 1.27 × 102 km. Calculate the satellite\'s kinetic energy, gravitational potential energy
A truck has its front wheels (only) driven onto a scale and a reading of 3000 kg is obtained. How far is the center of gravity from the front wheels
A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. When a 53.0-gram mass is attached at the 27.0-cm mark, What is the mass of the meter stick
two identical capacitors store different amounts of energy capacitor a stores 2.4 x 10-3 j and capacitor b stores 6.7 x
A 100kg astronaut carrying a 1kg ball as she flies past a space station with a velocity of 3/5. what is her mass after throwing the ball
When a solid uniform sphere is spinning about an axis through its center, its rotational kinetic energy is K. Obtain the rotational kinetic energy of the second sphere
A wheel of mass 1.24kg and radius 0.44 (I = 0.5mr^2) starts from rest and rolls without slipping for a distance of 1.7m down a 35 degree incline. How fast is it traveling at that point?
A parallel-plate air capacitor has a capacitance of 500 pF and a charge of magnitude 0.150 mu C on each plate. What is the surface charge density on each plate
A box of mass 2.1 kilogram is on a horizontal surface. Find the speed of the box after it has travelled a distance of 2.3 meter
a parallel-plate capacitor is charged to a potential difference of 120v. the area on each plate is 120cm2 and the
How would you calculatethe magnitude of the electric force of an electron at a distance of4.5 x10-10 m from a nucleus? (Ialready have the magnitude of a proton's electric field as6.40e+11 N/C , given that the proton has a charge of 1.44E-17C.)
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