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Measurements on two stars indicate that Star X has a surface temperature of 6127°C and Star Y has a surface temperature of 12127°C. If both stars have the same radius, what is the ratio of the luminosity (total power output) of Star Y to the luminosity of Star X? Both stars can be considered to have an emissivity of 1.0.
A person's body is covered with 1.8 m2 of wool clothing. How much heat per second does the person lose due to conduction
The coil is flipped so its plane is vertical to the magnetic field in 0.050 s. What is the magnitude of the average induced emf.
A near-sighted person might correct his vision by wearing diverging lenses with focal length f = -60cm. use ray tracing to determine the height of the image
It's possible to use the ideal-gas law to show that the density of the earth's atmosphere decreases exponentially with height, What is the weight of a column of air
The earth orbits the sun in a nearly circular orbit of radius 1.49 x 1011 m. What is the acceleration of the earth
An object moves 2.27m in the +x-direction under the influence of a 141N force directed 41 degrees above the x-axis. Find the work done on the object
The average counting rate for a radioactive sample is 486cpm. How do you find the probability that in any given 10 sec interval one gets less than 70 counts? Is this the same as the probability of getting less than 70 x6= 420 counts in 60 secs?
parallel plates that have an opposite charge have a distance of 5.33 mm between them, and a 600V potential difference. What is the magnitude of the electric field strength
As a soap bubble (n = 1.33) evaporates and thins, thereflected colors gradually disappear. What is the last color seen
In frame S, event B occurs 2 microseconds after event A and event A occurs at the origion whereas event B on the x-axis at x=3.3km. How fast must an observer be traveling along the +x axis
An airplane employee tosses a 15-kg suitcase with a horizontal velocity of 3 m/s onto a 35-kg baggage carrier. Knowing that the carrier is initially at rest and can roll freely, determine (a) the velocity of the carrier after the suitcase has slid to..
A thin film of glycerin (n=1.473) of thickness 524 nm with air on both sides is illuminated with white light at near normal incidence. What wavelengths will be strongly reflected
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