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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"?
You land on an unkown planet and start doing some physics experiments. What does therock weight on that planet
an astronaut is being tested in a centrifuge. the centrifuge has a radius of 6.12 m and in starting rotates according
A solid metal sphere of radius 4 meter carries a total charge of -7.60 uC. Obtain the magnitude of the electric field at a distance from the sphere's center of 0.20 meter
In proton-antiproton annihilation, a proton and an antiproton (a negatively charged particle with the mass of a proton) collide and disappear, producing electromagnetic radiation, Find the total energy of the radiation
A college student produces about 127 kcal of heat per hour onthe average. What is the rate of energy production in watts? How many kilocalories of heat does the operation of a 1195 Whair dryer produce each second?
A converging lens has a focal length of 25.0 cm. A ruler (30.0 cm in length) is located 50.0 cm in front of the lens and oriented at an angle of 90 degrees to the principal axis, as shown below. What are the a) location and b) height of the image?
A solid has a volume of 8cm3. When weighed on a spring scale calibrated in grams, the scale indicates 20g. What does the scale indicate if the object is weighed as immersed in a liquid of density 2g/cm3.
A mad scientist is designing a trap for intruders that will liftthem up into the air and hold them helpless. The device consists ofan equilateral triangle, 10.0 meters to a side, embedded in his floor.
A compact fluorescent light bulb (CFL) consuming 9 W electricity produces the same light output from a 40 W incandescent light bulb (incandescent light bulbs will be banned soon in Canada due to their low efficiency for producing light).
Skid is floating in space 3 m from Mitch. Skid and his backpack have a combined mass 50 kg. What will be the new distance between Skid and Mitch
A proton moving at 7.20 106 m/s through a magnetic field of magnitude 1.74 T experiences a magnetic force of magnitude 7.40 10-13 N. What is the angle between the proton's velocity and the field
A fully charged 6.2F capacitor is connected in series with a 1.7×105 resistor. What percentage of the original charge is left on the capacitor after 1.6s of discharging?
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