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A 100 W point source radiates yellowish-green light of wavelength 555 nm uniformly in all directions. This is the wavelength at which the human eye has peak sensitivity, a dark adapted eye capable of detecting as few as 10 photons per second. Assuming that the pupil of the dark adapted eye has a diameter of 7 mm, how far from the source could the light be detected?
Two parallel metal rods form a plane inclined at 20 degrees to the horizontal. The upper end of the rods are connected together by a resistor of 166ohms, What is the maximum speed of the bar
Two 40.0 µF capacitors in parallel are connected across a sinusoidal ac generator operating at 60.0 Hz. how much current passes through each capacitor
Find the force on each side of the loop and the torque acting on loop.
You produce an image of the Sun on a screen using a thin lens whose focal length is 28.3 cm. What is the diameter of the image in millimeters
W hat least energy an incident alpha particle must have to penetrate the gold nucleus. What is the direction of the carbon atom after the collision.
An object with mass m1 = 8 kg traveling with an x-velocity of V1x = 15/17 collides with an object with mass m2 = 12kg traveling with an x-velocity of V2x = - 15/13, Find the other object's x-velocity
The E' is an unstable particle, with a mean lifetime on 2.5x10^-10s. What is the minimum uncertainty in this particles energy
Point charges of 30.0 µC and 50.0 µC are placed 0.500 m apart. What is the magnitude and direction of the electric field halfway between them
You are driving a car which is heading 20 m/s towards a brick wall. You sound a horn which emits at a frequency of 400 Hz when at rest. What is the beat frequency that you hear
What is decrease in kinetic energy throughout the collision.
The tungsten filament of a certain 100 W light bulb radiates 4.00 W of light. Find the filament's temperature
A fireman, 25.6 m away from a burning building, directs a stream of water from a ground level fire hose at an angle of 39.5° above the horizontal
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