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The threshold intensity for a human eye to sense the presence of light is 50 photons falling on the retina within a period of 0.1 s. Assume a star radiates with an output of 0.5 ×1026 W in the visible spectrum, with a peak of ?=550 nm. (This star would be similar to the Sun, which radiates with 2.0 ×1026 W). Estimate how far away the star can be away and still be visible to the unaided eye on a dark night. Assume the pupil of the observer's eye has a diameter of 1.0 cm. Give your answer in light years (do not insert a unit). Please show work.
A regulation hockey puck of mass 675 g is sliding right at 1.66 m/s. What is the velocity (including magnitude and direction left/right) of the regulation hockey puck after the collision
Three liquids are at temperatures of 5.0°C, 21°C, and 33°C, respectively. Equal masses of the first two liquids are mixed, Find the equilibrium temperature when equal masses of the first and third are mixed
Write your solution on how to start from the time-dependent Schrodinger equation and arrive at the general solution of the wavefunction
A car is traveling at 50.0 mi/h on a horizontal highway, What is the stopping distance when the surface is dry and µs = 0.601
determine the force exerted by the wood on the bullet.
What is the integral from s to p of B dot dL, where an integral is taken along the dotted path shown, first from point P to point R at (x,y) = (0.707d, 0.707d), and then to point S at (x,y) = (0.6d, 0.6d).
James Stewart, 2002 Motocross/Supercross Rookie of the Year, is leading a race when he runs out of gas near the finish line. Determine the distance the racer travels before coming to a stop
Discover the horizontal and vertical displacement
An old-fashioned vinyl record rotates on a turntable at 49rpm . What are the angular speed in rad/s and the period of the motion
When Capacitor C1 having voltage V is connected with another capacitor C2 having zero charge in parallel with C1 what would be the dissipated energy.
A bird stands on a dc electric transmission line carrying 3300A (Figure 1) . The line has 2.7×10?5? resistance per meter, and the bird's feet are 3.5cm apart
In one day, a 85 kg mountain climber ascends from the 1440 m level on a vertical cliff to the top at 2360 m . The next day, she descends from the top to the base of the cliff, which is at an elevation of 1310 m
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