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A raft is made of 11 logs lashed together. Each is 57 centimeter in diameter and has a length of 7.3 meter. Determine how many people can the raft hold before they start getting their feet wet, assuming the average person has a mass of 67. Do not neglect the weight of the logs. Suppose the specific gravity of wood is 0.57.
suppose the strings on a violin are stretched with the same tension and each has the same length between its two fixed
A lead ball weighing 10 N falls 0.8 m from rest into a bucket of sand. The ball stops after making a crater 0.2 m deep. According to the work-energy theorem the work done by the sand on the ball in bringing it to rest is...?
n a series RLC circuit, the resistance is 26 O, the capacitance is 68 µF and the inductance is 40 mH. Find the power dissipated in the resistor
Suppose that the earth is a uniform sphere and that its path around the sun is circular. Determine the kinetic energy that the earth has because of its motion around the sun
A Helium balloon is anchored by a mass less string to the floor of a railroad car that is accelerating forward with acceleration A. Explain clearly why the balloon tends to tilt forward and calculate its angle of tilt in equilibrium
If the rubber of the balloon itself has a mass of 2.00 g and the balloon is filled with helium, calculate the net upward force (the "lift") that acts on it in air
A tennis racket has nylon strings. If one of the strings with a diameter of 1 mm is under the tension of 15 N, how much is it lengthened from its original lenght of 40 cm.
An object is located 12 centimeter in front of a curved mirror. The magnification of the image is -3.0. Evaluate what the focal length of the mirror
A baseball is thrown horizontally from from a height of 44.10 mabove ground with a speed of 33.5 m/s. Where is the ballafter 3.00 s have elapsed?
You are floating down a river at a speed of 3.0 m/s in a canoe while drinking a can of soda. You see your friend on a bridge ahead whose arm is 15 m above the water. How long was the can in the air
The third-order fringe of 650 nm light is observed at an angle of 17° when the light falls on two narrow slits. How far apart are the slits
An archer fires an arrow by an initial velocity of 21 m/s at an angle of 50 from the horizontal. The arrow lands on a hill that is 5.0 m higher than its initial height. Ignore the effects of air resistance. What speed does the arrow have when it land..
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