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The hot glowing surfaces of stars emit energy in the form of electromagnetic radiation. It is a good approximation to assume e=1 for these surfaces.
a) Find the radius of the star (assumed to be spherical) Rigel, the bright blue star in the constellation Orion, that radiates energy at a rate of and has surface temperature 11000.
b) Find the radius of the star (assumed to be spherical) Procyon B (only visible using a telescope), that radiates energy at a rate of and has surface temperature 10000.
On the Moon's surface, lunar astronauts placed a corner reflector, off which a laser beam is periodically reflected, What is the difference in travel time for light that travels only through space to the moon and back and light that travels through ..
A cruise ship sails 150 km east, then 250 km northwest, and then 100 km at 30° east of south, Find the magnitude and the direction of the last leg of the journey
A 1.6-kg book is at rest on a wooden board inclined at 12 degrees. Find the magnitude of each force
An electron librated from a hot filament cathode is attracted by an anode with a potential of 1200V positive with respect to the filament. Compute the speed of the electron when it strikes anode.
A solar concentrating heat exchanger system directs sunlight onto a long straight pipe. The pipe receives heat from sunlight at the rate of 153.616 Btu/hr per foot of length, find the rate of entropy production in this solar concentrator
A 305 turn solenoid has a radius of 7.00 cm and a length of 24.0 cm. Find the inductance of the solenoid
A student notices that 38 mm f11 appears near the lens of an inexpensive camera. What is the focal length of the lens. What is the diameter of the diaphragm opening
A simple pendulum with mass m = 1.5 kg and length L = 2.41 m hangs from the ceiling, What is the magnitude of the radial acceleration as the pendulum passes through the equilibrium point
q1. what are the average velocity and acceleration of the tip of an hour hand of a clock in the interval of noon to
A 0.80m -long metal rod is dropped vertically onto a marble floor. When the rod strikes the floor, What is the speed of sound in the rod
A steel aircraft carrier is 385 m long when moving through the icy North Atlantic at a temperature of 1.65°C. By how much does the carrier lengthen whereas it is travelling in the warm Mediterranean Sea at the temperature of 23.30°C.
The bottom of an aluminum pot has an area of 187 cm2 and a thickness of 5.25 mm. How many watts are needed to boil water at this rate
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