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A toy battery has an emf of 15.0 V. The terminal voltage of the battery is 11.6 V when it is delivering 20.0 W of power to an external load resistor R.
1) What is the value of R?
2) What is the internal resistance of the battery?
The mass of Mars, 6.40e23 kg, is about one-tenth of that of the Earth, and it's radius, 3395km, is about half of the earth. What is the mean density of Mars
Kathy Kool buys a sports car that can accelerate at the rate of 5.20 m/s2. She decides to test the car by racing with another speedster, Find the time it takes Kathy to overtake Stan
A 0.250 kg ball attached to a string s being swung in a vertical circle, like a roller coaster doing a loop-de-loop, with a radius of 1.15 m. What is the minimum speed at the top of the circle to keep the string from going slack
A 20,000 ohm resistor and a capacitor are connected in series and then a 15v potential differnce is suddenly applied across them. what is the capacitive value of the capacitor
One end of an iron poker is placed in a fire where the temperature is 515°C, and the other end is kept at a temperature of 24°C. The poker is1.2 m long and has a radius of 5.0 multiplied by 10 -3 m. Ignoring the heat lost along the length of the pok..
A square with sides of length L=.1 m has a point charge of 2 microC at each of its four corners. Find the magnitude of the force acting on any one of the charge
A satellite has a mass of 6264 kg and is in a circular orbit 4.32 × 105 m above the surface of a planet. estimate the true weight of the satellite
A 6.0 m long, 12 kg ladder rests against a smooth vertical wall with bottom of the ladder 3.0 m from the wall. What is the force the wall exerts on the ladder
Through an adiabatic process, the temperature of 3.62 {\rm mol} of a monatomic ideal gas drops from 480{\rm ^\circ C} to 240{\rm ^\circ C}. Discover the heat the gas exchanges with its surroundings
A seagull flies with a velocity of 12.5 m/s straight into the wind. (ie.. this the velocity of the gull relative to the wind), Calculate the speed of the wind
Four wires meet at a junction. In two of the wires currents I1 = 1.03 A and I2 = 2.05 A enter the junction. In one of the wires current I3 = 6.17 A leaves the junction. Find the current in the fourth wire and indicate its direction.
A pair of closely spaced parallel conducting plates, charged with equal and opposite electric charges, produces a uniform electric field in the region between them, What must the strength of the electric field be
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