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Question 1: To help you think about how illuminance varies with distance, suppose a small light source is placed at the center of two transparent spheres. One sphere has a radius,R, and the other a radius,2R. L lumens of light leave the light source and travel outward toward the spheres. How does the illuminance (the lumens passing through each square meter of surface) at the inner sphere compare to the illuminance at the outer sphere,assuming no light absorption? Try to solve this problem by thinking about the following:
1) how much of the light passes through the first sphere? how much passes through the second sphere?
2)how do the surface areas of the two spheres compare?
Question 2: Since most light bulbs that you use are not true point sources of light, how do you think the answer to question 1 would change if a typical light bulb were used?
What is fraction of the diameter of the Sun
A dog running in the +y-direction at 7.0 m/s hears its owner call from behind, Compute the dog's change in velocity
The area of a typical eardrum is about 5.0 × 10?5 m2. Calculate the sound power incident on an eardrum at the threshold of pain
explain the energy released in the explosion. A rock stuck in the tread of a 59.0 cm diameter bicycle wheel has a tangential speed of 3.20 m/s. When the brakes are applied, the rock's tangential deceleration is 1.20 m/s^2
The planet Neptune has a satellite, Proteus, which travels in an orbit 1.180*10^8 m with a period of 1.12 days. Calculate the mass of Neptune
A 1.5 kg mass attached it spring with a force constant of 20.0 N/m oscillates in horizontal, frictionless track. At t=0, Determine the total energy of the oscillating system
Three single-phase step-up transformers rated at 10MVA, 4.6kV/13.8kV are connected in Wye-Delta configuration. The three transformers are used to feed a 20MVA load at 0.9 p.f. With an efficiency of 96%. Find the secondary line voltage.
Write the input- output relationship for an ideal integrator. Determine the zero- input and zero-state components of the response
A plucked guitar string produces a sound wave of frequency 440 Hz. (a) What is the wavelength of the sound wave (assume the speed of sound in air is 340 m/s)? (b) How much time elapses between the impacts of two adjacent compression on your eardru..
A helium-neon laser of the type often found in physics laboratories has a beam power of 4.00 mW at a wavelength of 633 nm. Calculate the intensity of the focused beam
For research purposes a sonic buoy is tethered to the ocean floor and emits an infrasonic pulse of sound. Determine the wavelength of the sound
Prepare a multiple-step income statement for the year ended December 31, 2012, concluding with earnings per share.
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