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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 11.7 cm in diameter. What is the diameter of the needle?
what is the frequency of vibration of the string. If the shot was launched from 6.00 f above the ground at an initial angle of 42.0 degrees , what was its initial speed.
Two small frogs simultaneously leap straight up from a lily pad. Frog A leaps with an initial velocity of 0.676 m/s, what is the position and velocity of the other frog
A shotgun fires a large number of pellets upward, with some pellets traveling very nearly vertically and others as much as 1.0o from the vertical. suppose that the initial speed of the pellets is uniformly 150ms-1 and ignore air resistance.
A sample of an unknown material appears to weigh 255 N in air and 195 N when immersed in alcohol of specific gravity 0.700. What is the volume of the material
A wire is 1.4 m long and 1.3 mm2 in cross-sectional area. It carries a current of 5.8 A, Calculate the conductivity of the material of which this wire is made
what will be the induced emf magnitude in the short coil. A 77.9 kg fireman slides down a 4.13 m pole by applying a frictional force of 343 N against the pole with his hands. If he slides from rest, how fast is he moving once he reaches the ground.
A stone has a mass of 4.00 x10-3 kg and is wedged into the tread of an automobile tire, as the drawing shows. The coefficient of static friction between the stone and each side of the tread channel is 0.76.
Where Is The Net Force Zero? Three point charges lie along the x-axis. The positive charge q1 = 15.0 ?C is at the x = 2.00 m, What is the x coordinates of q3
A metallic hoop of radius 0.5m is perpendicular to a magnetic field into the page. What direction is the current induced in the hoop
For the cases in which total internal refection is possible from either the top or bottom surface of a layer, determine the amount by which the angle of incidence exceeds the critical angle.
A hot iron horseshoe (mass = 0.50kg ), just forged, is dropped into 1.50L of water in a 0.30kg iron pot initially at 25.0?C. estimate the initial temperature of the hot horseshoe
A runaway truck with failed brakes is moving with a speed of 130 km/h just before the driver steers up an emergency escape ramp inclined at 15 degrees above the horizontal
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