Electomagnetic Induction

1. Imagine a superconductor in its normal state in the shape of a ring immersed in a magnetic field parallel to the central axis (that is, perpendicular to the plane of the ring.) Suppose the ring is cooled and becomes superconducting. (a) Describe what happens to the field (b) If the ring is pulled parpendicularly out of the ...continues

Electromagnetic Induction

1. Imagine in a remote area of the countryside a 70-kV, 60-Hz power line. A shifty local resident has erected a large open loop just below the line with the intention of drawing power. Is this possible and, if so, how would it be transferred? Where would the energy stolen come from? Would anyone be able to detect the loss? Might ...continues

Magnetism

1. Why is a chunk of iron attracted to either pole of a magnet? What does this tell you about the reliability of attraction as a test of whether something is permanently magnetized or not? A classic puzzle involves two seemingly identical rods, one steel and magnetized (with poles at its ends), the other soft iron and not magnet ...continues

Magnetism

1. A lovely way to shield against the Earth's magnetic field was used in a monopole experiment at Stanford University. A deflated lead-foil balloon is cooled below its critical temperature. Inflating the balloon then provides a field-free region inside of its hollow. How does it work? 2. A flat cirular coil having a diameter ...continues

Magnetism

1. Imagine a small cylindrical permanent magnet floating above a superconducting tin disk bathed in liquid helium at around 1.2 K. The magnet was placed on the disk, and the latter was cooled below its transition temperature, at which point the magnet spontaneously jumped into the air. Explain what happened. This same kind of ma ...continues

Drawing circuits. Complete with solution diagrams in bmp format.

Draw a flashlight bulb and show where the current usually enters and leaves. Draw a D-Cell and label its two terminals. Now draw a diagram showing how to connect the bulb and cell with two lengths of wire. How might you connect them with one wire? Show the path of the current in each case.

Mass of air in a room.

Find out the mass of the air in a room 3.00m by 4.00m by 5.00m given that the temperature is 200 C at atmospheric pressure (1atm = 101000 Pa) Given that, Universal gas constant R = 8.314 J/ mol K, Boltzmann’s constant kB = 1.38 x 10-23 J/K Mass to mole ratio of air = 0.029 kg/mol

Word problems dealing with the Moon and Earth.

A grandfather clock is placed on the moon. The "g" value on the moon is 1/6 that of earth. If you wanted to keep time on the moon and wanted the pendulum period to be 1 second; how long must the string on the grandfather clock pendulum have to be?

Calculating surface tension and surface energy.

A water drop of radius 10^-2 m is broken in to 1000 equal droplets. Calculate the gain in surface energy. Surface tension of water is 0.075 N/m.

Introduction Physics College Homework Problem Help

1.A boeing 747 jet with 385 people cruising 39000 ft travels 280 yds on gallon of fuel. How many gallons will it need to travel 2000 km. a. How many meters does 200 km equal? b. How many meters does the plane travel per gallon of fuel? How many gallons will the plane need to travel 2000 km? 2. Hwo may liters of water w ...continues