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If your pupil diameter is 2 , as it would be in fairly bright light, what is the smallest diameter circle that you can barely see as a circle, rather than just a dot, if the circle is at your near point, 25 from your eye? Assume the light's wavelength in air is 600 and the index of refraction inside the eye is 1.33.
A basketball star covers 2.6 m horizontally in a jump to dunk the ball. His motion through space can be modelled precisely as that of a particle at his center of mass. His center of mass is at elevation 1.02m when he leaves the floor. It reaches a..
A 5 kg rock is dropped from rest down a vertical mine shaft. How long does it take for the rock to reach a depth of 79 m? Neglect air resistance.
An object is released from an aeroplane which is diving at an angle of 30 from the horizontal with a speed of 50m/s. If the plane is at a height of 4000m from the ground when the object is released, find the velocity of the object when it hits the gr..
Sound is generated from standing waves in two tubes which are both open at both ends and are identical, apart from one tube having length L and the other tube being only seven eighths as long. If the speed of sound is v, what is the expression for th..
A loud speaker is playing rock music. Consider the sound from it as a spherical wave. what is the sound intensity level
A 38.8-kg boy, riding a 2.27-kg skateboard at a velocity of +5.22 m/s across a level sidewalk, jumps forward to leap over a wall. What is the skateboard's velocity relative to the sidewalk
A nonuniform horizontal bar of mass m is supported by two massless wires against gravity. What is the position of the center of mass of the bar
An air-filled parallel-plate capacitor has plates of area 2.10 cm2 separated by 0.50 mm. The capacitor is connected to a 3.0 V battery. What is the charge on the capacitor
a boy and a girl are balanced on a massless seesaw. the boy has a mass of 75 kg and the girls mass is 50 kg. if the boy
A putty of mass 0.06 kg is droppe at height h = 1 m above a horizontal rod. two 2 kg balls are attached to the ends of the thin rod, which has a mass of 1 kg and also is 1 m long. The rod can rotate about a horizontal axis.
The Millenium Falcon is chased by the Imperial Forces. The ship is moving at a speed of 0.549 c. What is the velocity of the protons in the resting frame when the cannon is shot in the backward direction
What current must exist in the conductor for the tension in the supporting wires to be zero when the magnetic field is 3.40 T into the page
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