Determine the power of the laser beam
A 86-mW vertically polarized laser beam passes through a polarizer whose polarizing angle is 25° from the horizontal. What is the power of the laser beam when it emerges from the polarizer?
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What constant force must be exerted on the rope to bring the merry-go-round from rest to an angular speed of 0.500 revolutions per second in 2.00s?
Every day our Earth receives 1.55×1022 J energy from the Sun. If we were able to use 0.75 percent of this energy to accelerate spaceships, then how many missions would be possible in one year?
Two polarizers are out of alignment by 30°. If light of intensity 7.57 W/m2 and initially polarized halfway between the polarizing angles of the two filters passes through the two filters, what is the intensity of the transmitted light?
Find the exit temperature of the air in °C. Find the velocity of the air at the exit (m/s) if it is flowing through a rectangular duct that is 25 cm x 50 cm.
Assuming the ideal gas model for the air, determine the pressure and volume at the beginning of the isothermal expansion in kPa and m3, respectively.
(a) Find the wavelength of the sound upwind of the siren. (b) Find the wavelength of the sound downwind of the siren.
If the pot is initially full of saturated water at 200 kPa, how much energy must be added to the pot before the total mass of the water has been reduced by half?
Two asteroids head straight for Earth from the same direction. Their speeds relative to Earth are 0.79c for asteroid 1 and 0.60c for asteroid 2. Find the speed of asteroid 1 relative to asteroid 2.
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