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A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.0 V when it is delivering 22.0 W of power to an external load resistor R.
a) What is the value of R?
b) What is the internal resistance of the battery?
A wave has a known propagation velocity of 4.32 m/s and a wavelength of 0.388 meters. What is the position equation of the wave
A 0.4 kg mass attached to a spring is pulled back horizontally across a table so that the potential energy of the system is increased from zero to 150 J. find the kinetic energy of the system after the mass is released
Coin is placed 14.0 from the axis of the rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on turntable until a rate of 40.0 (revolutions per minute) is reached, at that point the coin s..
Two otherwise identical bodies have temperatures of 330K and 3000K , respectively. By what factor does its emission exceed the emission of the other body
A reflecting telescope has a main mirror with fM = 620 mm. If an eyepiece with a magnification of 15 is used, what is the total magnification of the telescope
When a 24 Ohm resisotr is connected across a 12 Volt Battery, a current of 482 ma flows. What is the power delivered by the emf of the battery
In and 8.00 km race, one runner runs at a steady11.0 km/h and another runs at 14.0 km/h. How far from the finish line is the slower runner
A closed steel object is known to have a hollow cavity withint it. It weights 4800 N in air and 3200 N when wieghed under water. What is the outside volume of the object
A 4.7-g object moving to the right at 18 cm/s makes an elastic head-on collision with a 9.4-g object that is initially at rest. What is the velocity of the 4.7-g mass after the collision
Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree at an angle of 33° above the horizontal. What is the magnitude of the net torque exerted on the branch by the children
Johnie wants to go sailing, but their is no wind. Johnie mounts an Industrial Fan on his sail boat with a 40 N force. What is the speed of the boat
A sphere of radius r starts from rest and rolls without slipping along a curved surface, Find the final speed v of the sphere's center of mass
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