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A point source of light is 84.2 cm below the surface of a body of water. Find the diameter of the circle at the surface through which light emerges from the water. Water has an index of refraction of 1.33.
A force applied to an object of mass m1 produces an acceleration of 3.90 m/s2. The same force applied to a second object of mass m2 produces an acceleration of 2.00 m/s2. (a) What is the value of the ratio m1/m2? (b) If m1 and m2 are combined into on..
if a tune LC circuit has a capacitance of 7. 10^-2 pF and an inductor of 100 uH, what is its natural frequency
Two metal plates are held together by two steel rivets, each of diameter 0.24 cm and length 1.3 cm. How much force must be applied parallel to the plates to shear off both rivets?
A 21 kg solid door is 220 cm tall, 94 cm wide. What is the door's moment of inertia for rotation about the vertical axis inside the door, 17 cm from one edge.
A crane lifts a 2000kg load 40 meters. what will be the work done by the load? If it takes 8 seconds to do this work what is the power output for the crane
A prospector finds a solid rock composed of granite (? = 2650 kg/m3) and gold. The volume of the rock is 3.40 10-4 m3 and its mass is 3.87 kg. a) What mass of gold is in the rock? b) What percentage of the rock is gold by volume? c) What percentag..
A camper is trying to start a fire by focusing sunlight onto a piece of paper. The diameter of the sun is 1.39 × 109 m, What is the area of the sun's image on the paper
A diffraction grating 1.5 mm wide produces the 5th order at 45 degrees with light of wavelength 650 nm on a screen 80 mm away. What is the total number of lines on the grating
A mortar* crew is positioned near the top of a steep hill. Enemy forces are charging up the hill and it is necessary for the crew to spring into action. How fast will the shell be traveling when it hits the ground
What is the velocity of each ball. while both pipes vibrate at their fundamental frequencies, a beat frequency of 15 Hz is heard. How many centimeters were cut off the end of the second pipe? The speed of sound is 343 m/s.
A point charge with a charge q1 = 2.60?C is held stationary at the origin. How much work is done by the electric force on q2
A light bulb is connected to a 120.0-V wall socket. The current in the bulb depends on the time t according to the relation I = (0.703 A) sin [(257 rad/s)t]. Determine the resistance of the bulb's filament
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