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A stroboscope is a light that flashes on and off at a constantrage. It can be used to illuminate a rotating object, and ifthe flashing rate is adjusted properly, the object can be made toappear stationary.
(a) What is the shortest time between flashes of light that will make a three-bladed propeller appearstationary when it is rotating with an angular speed of 16.7 rev/s?
(b) What is the next shortest time?
A frictionless spring of spring constant 500 N/m has one end attached to a verticalwall and the other end to a block of mass 2.0 kg, Find the amplitude and frequency of oscillation
One cubic meter of water flowing over Niagara Falls in New York drops 98.1 meters. how much heat energy would the water have
assume that adults have iq scores that are normally distributed with a mean of 105 and a standard deviation of 20. find
A pendulum of length 50cm is pulled 30 cm away from vertical axis and free from rest. What would be its speed at the bottom of its swing.
A ball is thrown from the ground into the air. At a height of 9.1 m, the velocity is observed to be v = 7.1i + 6.8j, What will be the total horizontal distance traveled by the ball
The left end of a long glass rod, 10.0 in diameter, has a convex hemispherical surface 5.00 in radius. Determine the position of the image of an object placed in air
A particular heat engine has a useful power output of 4.40 kW and an efficiency of 30.0%. The engine expels 7200 J of exhaust energy in each cycle. Find the energy taken in during each cycle
A diver makes 2.0 revolutions on the way from a 9.8-m-high platform to the water. Assuming zero initial vertical velocity, find the diver's average angular velocity during a dive
q1. at one instant a bicyclist is 40.0 m due east of a parks flagpole going due south with a speed of 10.0 ms. then
A 4.25 bullet traveling horizontally with a velocity of magnitude 375 is fired into a wooden block with mass 1.10 , initially at rest on a level frictionless surface. The bullet passes by the block and emerges with its speed reduced to 110 .
At a certain location, the Earth's magnetic field has a magnitude of 5.5.*10^-5 T and points in a direction that is 76 degrees below the horizontal. Find the magnitude of the magnetic flux through the top of a desk at this location that measures 140c..
What is the longest wavelength of light that may be absorbed by a hydrogen atom that starts in the second excited state
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