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The motor of a ski boat generates an average power of 7.70 104 W when the boat is moving at aconstant speed of 15 m/s. When the boat is pulling a skier at the same speed, the engine must generatean average power of 8.70 104 W. What is the tension in the two rope that is pulling the skier?
A 40-N stone is dropped from a height of 10m and strikes theground with a velocity of 7 m/s. What average force of air frictionacts on it as it falls
a six lead-acid type of secondary cells each of emf 2.0 v and internal resistance 0.015nbspomega are joined in series
A hollow cylinder (hoop) is rolling on a horizontal surface at speed 5.5m/s when it reaches a 11?incline. How far up the incline will it go
In a simple of the hydrogen atom, the electron revolves in a circular orbit around the proton with a speed of 1.1 x 106 m/s. Determine the radius of the electron's orbit
a 98-g piece of copper is heated in a furnace to a temperature tc. the copper is then inserted into a 150-g copper
puffy cumulus clouds which are made of water droplets occur at lower altitudes in the atmosphere. wispy cirrus clouds
Two infinite positively charged plates with a uniform chargedensity of 6.80 μC/m2 are placedparallel to the yz-plane with one plane passing through x = 0.65cm and the other through x = -0.65 cm, as shownin the diagram below.
Suppose a small boat is at the crest of this wave, 1.5 {rm m} above the equilibrium position. Illustrate what will the vertical position of the boat be 5 seconds later?
The potential energy of a +1 10-6 C charge decreases from 0.06 J to 0.02 J when it is moved from point A to point B. What is the change in electric potential between these two points
A squirrel falls from a very tall tree. Initially at t= 0), the squirrel is at the top of the tree, a distance y 50 m above the ground. Estimate the average velocity of the squirrel
A tennis player swings her 1000g racket with a speed of 10m/s . She hits a 60g tennis ball that was approaching her at a speed of 21m/s. what is the average force that the racket exerts on the ball
Two identical point charges are fixed to diagonally oppositecorners of a square that is 2.8 m on aside. Each charge is +3.5 µC. How much work is done by the electricforce as one of the charges moves to an empty corner?
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