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Question: A physicist has an idea to use three wires with different gauges (thicknesses) and connect them in series with a 9V battery. Each wire has the same length and the total length is 1.4m. The thickest wire is 2.2 mm thick, the middle one, 1.5mm thick, and the thinnest one is 0.3 mm in diameter. Which of the three wires is going to be the hottest? What is the electric potential difference measured across each of the three wires? What is the electric field in each of the 3 wires?
A string with one 10-g washer on the end is attached to the rearview mirror of a car. When the car leaves an intersection, the string makes an angle of 5 with the vertical. What is the acceleration of the car?
a simple camera telephoto lens consists of two lenses. the objective lens has a focal length of f1 39 cm. precisely
A 1.15 K? resistor and a 505 mH inductor are connected in series to a 1250 Hz generator with an rms voltage of 14.2 V. What is the rms current in the circuit
A car with a mass of 2200 kg is traveling at a speed of 40.0 km/h on an icy road when it collides with a 10000 kg truck which was traveling toward the car with the speed of 18 km/h
A tow truck is pulling a car out of a ditch by means of a steel cable (Y = 2.0 x 1011 N/m2) that is 9.63 m long and has a radius of 0.503 cm. How much has the cable stretched
A diverging lens with f= -26.0 cm is placed 11.0 cm behind a converging lens with f= 20.0 cm. Where will an object at infinity be focused
A uniform beam of weight W and length L is supported by two wires made of the same material, but of different diameters. What will be the ratio of the two frequencies
For a certain change, the value of ëU is -2.37 kJ. During the change, system absorbs 650 joules. How much work did the system do.
A person drives a car at a constant speed of 90 km/h along a straight line from point A to point B and then drives back along the line from B to A at a constant speed 110 km/h. What is her average speed over the entire trip?
The resulting heat causes a gas expansion that pushes a piston 10 cm against a constant external pressure of 1000 kPa. Calculate the work w.
A football kicker can give the ball an initial speed of 24 m/s. He is 54 m from the goalpost which has a crossbar 3.46 m high. What is the smallest angle of elevation
question a person swings a 0.521-kg tether ball tied to a 4.60-m rope in an approximately horizontal circle. if the
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