Physics Heat & Thermodynamics Level: Misc Level
An 800 M W electric power plant has an efficiency of 30%.If loses its waste heat in large cooling towers. Approximaterly how much waste heat ( in M J) is discharged to the atmosphere per second?The answer is 1900 M J.
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
A current I = 0.005859 A flows through a wire. Find the magnetic field B at a perpendicular distance r = 0.0929 m from the wire.
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
A 5824 turn coil carries a current I and has radius R =0.03696 m. If the magnetic field at the center of the coil is B =0.000122 Tesla, determine the magnitude of the current.
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
An N = 36 turn circular coil of radius r = 0.0005579 m carries a current I = 0.006765 A. The coil s normal makes an angle 0 =46.53 % with respect to a uniform magnetic field of magnitude B. The coil experiences a torque r =0.0008442 N m. Find B.
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
Why does a compass needle inmost places not point due north?
Physics Work,Power & Energy Level: Misc Level
What is the source of the energy that powers most geological processes?
Physics Waves And Oscillations Level: Misc Level
What can be said about an earthquake whose magnitude is 0 on the Richter scale? Whose magnitude is 8 or more?
Physics Properties Of Matter Level: Misc Level
Water vapor is the most important" greenhouse gas" in the atmosphere, you more attention is paid in this respect to carbon dioxide. Why do you think this is so?
Physics Properties Of Matter Level: Misc Level
What does it mean to say that a certain volume of air has a relative humidity of 50 percent? of 100 percent?
Physics Properties Of Matter Level: Misc Level
Suppose you are climbing in an airplane that has no altimeter. How could you tell when you are approaching the top of the troposphere?
Physics Current Electricity Level: Misc Level
Wire A has a potential difference of 50 V across it and carries a current of 2 A. Wire B has a potential difference of 100 V across it and also carries a current of 2 A. Compare the resistances, rates of flow of charge, and rates of flow of energy in the two wires.
Physics Current Electricity Level: Misc Level
A 120 -V electric coffeepot draws a current of 0.6 A. What is the resistance of its heating element?
Physics Electromagnetic Induction Level: Misc Level
Given a coil of wire and a small light bulb, how can you tell wheter the current in another coil is direct or alternating without touching the second coil or its connecting wires?
Physics Diffraction Level: Misc Level
A beam of protons, at first moving slowly, is accelerated to higher and higher speeds. When the protons are moving slowly, the beam spreads out, but when they are moving fast, the beam diameter decreases. What do you think is the reason for this behavior?
Physics Magnetism,Magnetic Effects Of Current Level: Misc Level
A length of copper wire A B rests across a pair of parallel copper wires that are connected to a battery through a switch. The arrangement is placed between the poles of a magnet and the switch is closed. In what direction does the wire A B move?
