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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 light ray incident on a smooth plane makes an angle 60 degree with the plane. Compute what is the angle of reflection
Why dont positive ions attach all along the length of the DNA until the DNA is electrically neutral? What, if anything, opposes that process?
What is the magnitude and direction of the electric field as a function of distance from the center of the spherical shells?
A boy in a wheelchair (total mass 50.5 kg) has speed 1.40 m/s at the crest of a slope 2.40 m high and 12.4 m long. Find the work he did in pushing forward on his wheels during the downhill ride
A fighter jet is launched from the aircraft carrier with the aid of its own engines and a steam powered catapult. The thrust of its engines is 2.3E5N. What is the work done on the jet by the catapult
What derivative does this tell us about? Define the function and give units for each variable.
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.
A 1300 nF capacitor with round parallel plates 1 cm in radius is accumulating charge at the some unknown rate at time t0. What is the changing rate of the charge
A parallel plate capicator has plates that are 2.25 mm apart. What is the capacitance of this capacitor
American physicist Robert A Millikan (1868-1953) won the 1923 Nobel Prize in physics. Calculate the work function. W0, for the metal, without knowing the value for Planck's constant.
If a clock is placed on the surface of the moon, how much of a time difference will there be compared with an earth-bound clock after 1 month due to gravitational effects? (The mass of the moon is 7.36 × 1022 kg, and the radius of the moon is 1737..
A 0.6410-kg ice cube at -12.40°C is placed inside a chamber of steam at 365.0°C. calculate the final temperature of the puddle
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