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The resistance across your (wet) tongue, from one side to the other near the tip, is 375 ? (assume that your tongue is an ohmic material). What current is flowing through the saliva that coats your t
What is the wavelength of the peak of the blackbody radiation curve for an emitter at temperature 242 K
2 mol of He gas initially at STP are sealed in a cylinder with a movable piston. Heat is extracted from the gas until it reaches a temperature of 100 K. What is the thermal efficiency of this engine
Calculate the ratio of heating loss in a given length of wire (assumed ohmic) carrying current at 530 kV to when it operates at 120 V
A generator produces 29 kilovolts (24,000 volts divided by 1000 = 24 kilovolts) of AC and a transformer steps this voltage up to 368 kilovolts for transmission over power lines
A decade before Einstein published his theory of relativity, J.J. Thomson proposed that the electron might consist of small parts, Find the total electric potential energy of this arrangement
The gravitational potential energy of all the water stored behind a very large dam is 1.2Ã-10^16 J, How far apart should you place the charges
Superconductors have been discussed as a means for electrical energy storage. Because they are resistanceless, how much electrical energy (in kWh) could be stored
A certain element has a mass per mole of 54.9380 g/mol. How many moles of atoms are in a 268-g sample
A wheel of radius 30 cm is rotating at a rate of 2.0 revolutions every 0.080 s. What is the wheel's frequency of rotation
The microwave radiation left over from the Big Bang explosion of the universe has an average energy density of 3.88 Ã- 10â€"14 J/m3
A step-down transformer has a turns ratio of 1:10, and its primary is connected across the terminals of a standard 120-V wall socket
A concave mirrior is to form an image of the filament of a headlight lamp on a screen 8.00 m from the mirrior. The filament is 6.00 mm tall, Is the image upright or inverted
The left end of a long glass rod is 8.00 cm in diameter, with an index of refraction of 1.60, is ground, Find the position of the image of the arrow formed by paraxial rays incident on the concave sur
A 5kg particle is hit with a 5N force for 0.2s towards a wall 5m away. How long does it take for the particle to hit the wall
a 4.0x10^6 ohm resistor is connected in series with a 0.50 microfarad capacitor. What is the change in voltage between t=RC and t=3RC
Two thin-walled concentric conducting spheres of radii 5.0 cm and 10 cm have a potential difference of 100 V between them
A transformer is designed to step down the 220V line voltage to 11V. how many turns should there be on the output coil
A point charge +q of mass m, (m,+q) is placed at point P along the x-axis where V_r(infinity) is known. Find the expression for the new velocity at the second point
In alpha decay, an alpha particle (a helium nucleus consisting of two protons and two neutrons) escapes from a heavy nucleus, find the initial electric potential energy of the alpha particle
A van de Graaff generator consists of a conducting sphere of radius 20 cm supported on a long insulating tube. What is the electric field at the surface of the sphere
A 300g rock tied to a string is rotated in a vertical circle (up and down, so gravity is important) with radius 0.5m. what is the rotation rate of the rock
An electron is acted on by an electric force of 5.1e-14 N. find the magnitude of the electric field at the electron's location
An electic dipole has charges of +or- 4.10pC that are separated by 6.25cm. Determine the net force on the dipole
An electrically neutral thin, square metal slab, measuring 6.00cm on a side is placed in a uniform external field that is perpendicular to its square area. What is the total charge on the negative s