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A generating station is producing 1.90 106 W of power that is to be sent to a small town located 5.0 km away. Each of the two wires that comprise the transmission line has a resistance per kilometer of length of 5.00 10-2 ?/km
(a) Find the power used to heat the wires if the power is transmitted at 1050 V.
(b) A 50:1 step-up transformer is used to raise the voltage before the power is transmitted. How much power is now used to heat the wires?
What minimum constant acceleration does the aircraft require if the aircraft is to be airborne after a takeoff run of 222m.
A hot-air balloon has just lifted off and is rising at the constant rate of 2.2 m/s . Suddenly one of the passengers realizes she has left her camera on the ground.
An electron is accelerated through an electric potential of 255 V, Find the radius in cm of the subsequent circular path for this electron
What is the magnitude of the acceleration of an electron at a point where the electric field has magnitude 6656 N/C and is directed due east?
A 3.5 k and a 1.5 k resistor are connected in parallel and this combination is connected in series with a 1.8 k resistor. If each resistor is rated at 1/2 W, what is the highest voltage that can be applied across the whole network.
A 15m uniform ladder weighing 500 N rests against a frictionless wall. The ladder makes 60 angles with the horizontal.
On a certain amusement park ride, passengers are seated in a horizontal circle of radius 7.5m. the seats begin to rotate from rest and are uniformly accelerated for 21 seconds to a most rotational speeds of 1.4 rad/s.
What is its initial velocity as it leaves the ground. Two particles are fixed on an x axis.
A child on a boat throws a 5.40 kg package out horizontally with a speed of 12.0 m/s. determine the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 26.5 kg and the mass of boat is 55.5 kg.
Suppose a formula for gain in heat energy of an object is H = m(A - B), where m = mass and (A - B) is its rise in temperature between A degrees and B degrees (as in #4). Write an expression for the absolute uncertainty, delta-H, in terms of m, del..
Two spheres with masses m1 = 820 kg and m2 = 830 kg are separated by 0.230 m. What is the net gravitational force from them on a 3.0 kg sphere located 0.161 m from m1 and 0.069 m from m2? Use a + sign if the direction is towards m2 and a - sign if..
Determine its average velocity for this trip. conclude the car's displacement.
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