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Sailors use a technique called "hiking out". What purposedoes positioning themselves in this way serve? If the wind werestronger, what would they need to do to keep their craftstable?
A ladder is leaning on a frictinoless wall. A painter climbsup 70% of the ladder. Find the coefficient of friction that holds the ladder at its place
How long will it take a 1,000W electric plate to bring 0.5kg of water to boil from a temperature of 20 degrees celcius? Assume all of the heat produced by the electric plate goes into heating the water.
Two figure skaters, one weighing 625N and the other 775N , push off against each other on very smooth ice. If the heavier skater travels at 1.60m/s , how fast will the lighter one travel?
A 10-kg bucket is lowered by a rope in which there is 63N oftension. What is the acceleration of the bucket
A certain light source is found to emit radiation whose peak value has a frequency of 1.83E+15 Hz. Calculate the temperature of the source
A swimmer, capable of swimming at a speed of 0.8 m/s in still water (i.e., the swimmer can swimwith a speed of 0.8 m/s relative to thewater), starts to swim directly across a 3.0 km wide river. However, the current is 0.91 m/s,and it carries the s..
A 1500 kg car traveling at a speed of 20 m/s skids to a halt on wet concrete where kinetic friction= 0.20. How far are the skid marks.
A wire is 1.50 m long and has a diameter of 1.50 mm. The tensile modulus of the wire is 6.20 x 1010 N/m2. what is the increase in length of the wire
An alpha particle approaches a 197 AU nucleus with a speed of1.5x10^7 m/s. In what direction does the nucleus recoil, and with what speed
A force of 10N acts on two blocks on frictionless surface. the first block is 3kg, and the second block is 2kg. what is the acceleration of the system? what force does the 3kg block exert on the 2kg block? what force does the 2kg block exert on th..
A 500.0 g mass at the end of a spring vibrates 3.0 times per second, What is the maximum velocity of this mass
Light of two wavelengths, ? = 520 nm and ?' = 550 nm falls normally on a diffraction grating having 3500 lines/cm. Determine the distance between the two spectrum lines in the first order. Repeat for the second order
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