Calculate the number of photons of green light
The human eye can percieve green light of wavelength 550 nm whenthe rate of incidence of radiation is 2.0 x 10-16J/s. Calculate the number of photons of green light of 550 nm wavelength that must fall on the retina per second to produce vision.
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A system is composed of 5 components, each of which is either working or failed. Consider an experiment that consists of observing the status of each component, and let the outcome be given by a vector (x1; x2; :::; x5) where xi = 1 if that compon
Find the force (magnitude and direction) exerted on her by the bungee cord at an instant when her downward acceleration has a magnitude of 6.2 m/s2. Ignore the effects of air resistance. Take the upward direction as positive.
Traveling at a speed of 17.2 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.630.
By how much could the value 420 be decreased without affecting the value of the sample median? (Enter infinite if there is no limit to the amount.)
Assuming the descent is vertical, find the magnitude of the thrust needed to reduce the velocity to zero at the instant when the craft touches the lunar surface.
Draw the process on a T-s diagram. What is the thermal efficiency of the cycle? What is the mass flow rate of air (lbm/h)? How much net power is developed by the cycle (BTU/h)?
Mineral oil can be used in place of mercury in manometers when small pressure changes are to be measured. What is the pressure ofan oxygen sample in mm of mineral oil if its pressure is 28.5 mmHg? (density of mineral oil = 0.88 g/mL ; density of H
Tidal effects in the Earth-Moon system are causing the Moon's orbital period to increase at a current rate of about 35 ms per century. Assuming the Moon's orbit around the Earth is circular, to what rate of change in the Earth-Moon distance does t
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