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Two long barges are moving in the same direction in still water, one with a speed of 10 km/h and the other with a speed of 18 km/h. While they are passing each other, coal is shoveled from the slower to the faster one at a rate of 460 kg/min. How much additional force must be provided by the driving engines of (a) the faster barge and (b) the slower barge if neither is to change speed? Assume that the shoveling is always perfectly sideways and that the frictional forces between the barges and the water do not depend on the mass of the barges.
Tritium has a half-life of 12.3 y and can also be used to date organic matter. If the activity of tritium is determined to be 3% of the expected activity, what is the age of the sample
A girl who is learning karate is going to break four bricks with her hand. Her hand and arm mass is 1.56 kg. what is the force delivered to the bricks
The near point of an eye is 109 cm. A corrective lens is to be utilized to allow this eye to clearly focus on objects 26.0 cm in front of it. What must be the focal length of the lens? What is the power of the required corrective lens?
Two small metallic spheres, each of mass m = 0.192 g, are suspended as pendulums by light strings of length L as shown in the figure below. The spheres are given the same electric charge of 7.6 nC, and they come to equilibrium when every string is at..
A 0.14- kg block on a wooden table is given a sharp blow with a hammer. The block then slides across the table to a stop. How far does the block go
Two submarines are moving towards each other in a portion of the Atlantic Ocean where the water is calm. Sub A is moving at 14.0 m/s, What frequency does sub B detect
You have a diverging lens of focal length-20cm. for what range of object distances will the image be larger than the object? for what range of object distances will the image be virtual?
The diodes are oppositely oriented, so that when one diode is forward-biased, the other is back-biased. Which phrase best describes the current in the circuit.
The following equations may need to be used - Eccentricity, universal gravitation, acceleration due to gravity, escape velocity, Kepler's 3rd Law
A 101 g ball is tied to a string. It is pulled to an angle of 5.20 degrees and released to swing as a pendulum. How long is the string
Suppose a lake has a layer of ice 11 cm thick on its surface. The top of the ice layer is cooled by the atmosphere to -5.25° C. At what rate is heat transferred through a 1.5 cm2 area of the ice
A person undergoing radiation treatment for a cancerous growth receives an absorbed dose of 1.8 Gy. All the radiation is absorbed by the gowth. Determine the rise in temperature
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