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You find an unlabeled box of fine needles, and want to determine how thick they are. A standard ruler won't do the job, since all you can tell is that each needle is less than a millimeter thick. So to find the thickness, you use the needle to poke a hole in a piece of brown construction paper. Then you arrange your 670 nm laser pointer to shine through the hole, and a circular diffraction pattern, consisting of a central bright circle surrounded by alternating dark and bright rings, appears on the wall 20.7 m away. Now you can use your ruler to measure that the central bright circle is 10.2 cm in diameter. What is the diameter of the needle? Please explain your work and the equation that you used. THe answer is in micrometers
A thin uniform rod (mass = 1.95 kg) swings about an axis that passes through one end of the rod, What is the length of the rod
A 1530 kg car is travelling with the speed of 15.0 m/s. What is the magnitude of the horizontal net force that is required to bring the car to the halt in a distance of 40.00 m.
What is amplitude of the electric component of the signal
Use Gauss law to compute amount of charge
A block of wood, with density 780 kg/m3 has a cubic shape with sides .0330 m long. What is the mass of the lead
A frictionless pulley has the shape of a uniform solid disk of mass 4.00 kg and radius 28.0cm. A 3.60 kg stone is attached to a very light wire that is wrapped around the rim of the pulley, and the stone is released from rest. As it falls down, the w..
What is the minimum thickness of the film. what is the magnitude of the average acceleration of the ball through out this time interval.
Determine the angular acceleration of the pulleys and the tension T in the cord supporting the 612 Kg mass when it is released from rest.
assuming each galaxy contains the mass of 200 billion suns and there are 200 billion such galaxies, what is the schwarzschild radius of the universe
A tuning fork has a frequency of 128 Hz, what is the period of the tuning fork
As a bat flies toward a wall at a speed of5.70m/s , What frequency does the bat hear in the reflected wave
In making raspberry jelly, 887 g of raspberry juice is combined with 930 g of sugar. The mixture starts at room temperature, 23.0°C, and is slowly heated on a stove until it reaches 220°F, How much energy does the mixture absorb
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