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The concrete wall of a building is 0.120 m thick. The temperature inside the building is 23.8 °C, while the temperature outside is 0.0 °C. Heat is conducted through the wall. The outside of the wall loses the energy only due to radiation. What is the emissivity of the wall?
At the local playground, a 16 kilogram child sits on the end of a horizontal teeter-totter, 1.5 meter from the pivot point. Find in which direction does the teeter-totter rotate
Two isotopes of carbon, carbon-12 and carbon-13, have masses of 1.993 x 10-26kg and 2.159 x 10-26 kg, respectively. Determine the spatial separation between the two isotopes
A long wire carrying a 6.0A current perpendicular to the xy-plane intersects the x-axis at x= +2.0cm. At what point on the x-axis is the magnetic field zero if the two currents are in the same direction
Two positive charges of 7.40 micro-Coulombs are placed on a horizontal surface with a coefficient of static friction 0.72. If they are originally far apart.
A 42 kg pole vaulter running at 11 m/s vaults over the bar. Her speed while she is above the bar is 0.7 m/s. Avoid air resistance, as well as any energy absorbed by pole, and determine her altitude as she crosses the bar.
Two short-lived isotopes of an element are produced in a nuclear reaction. One of these isotopes has a mass of 5.3731 amu and accounts for 75.5% of the production. The remaining isotope has a mass of 7.3904 amu. Use this information to calculate t..
Light of a certain frequency has a wavelength of 442 nm in water. The index of refraction of water for this light is 1.333. What is the wavelength of this light in benzene
A particle leaves the origin with a speed of1 × 106 m/s at 30? to the x axis. It moves in a constant electric field E = Eyˆj. Find Ey such that the particle will cross the x axis at x = 2.5 cm if the particle is an electron.
Find the various changes in entropy due to the melting of the ice. What is the change in entropy, NS, of the block of ice? What is the change in entropy, NS, of the lake?
Two particles of identical mass m are acted on only by the gravitational force of one upon the other. If the distance d between the particles is constant, what is the angular velocity of the line joining them? Use Newton's second law with the cen..
You work in a materials testing lab and your boss tells you to increase the temperature of a sample by 48.7%u2218C. what is its temperature in degrees Fahrenheit
two point charges of 30 nc and -40 nc are held fixed on an x axis at the origin and at x 76 cm respectively. a
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