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How long does it take the Sun to melt a block of ice at 0C with a flat horizontal area 1.0m^2 and thickness 2.0cm ? Assume that the Sun's rays make an angle of 38 with the vertical and that the emissivity of ice is 0.050.
compute the kinetic and potential energies of an airplane weighing 5.00 tons flying at a height of 30.0 times 103 ft at
A 100 cm long, 1.2 mm diameter steel guitar string must be tightened to a tension of 1700 N by turning the tuning screws. By how much is the string stretched
An unknown material has a normal melting/freezing point of -26.3° C, and the liquid phase has a specific heat capacity of 160 J/(kg · C°). find the latent heat of fusion of the unknown material
A down jacket has a surface area of 0.75 m2 and is filled with a 4.1 cm thick layer of down, At what rate is heat conducted through the coat
A 7.4muC charge and a -4.3mC charge are inside an uncharged sphere. What is the electric flux through the sphere
A proton is moving in the uniform electric field of part A. At point A, the velocity of the proton is 1.95×104{\rm m/s} , again pointed towards the east. What is the speed of the proton at point B
three objects, with m1 = 10.2 kg and m2 = 23.5. They are connected by strings that pass over massless and frictionless pulleys. What is the acceleration of the three objects
A helium-neon laser emits light of wavelength 632.8 nm and has a power output of 4.0 mW. How many photons are emitted per second by this laser
Suppose that by stirring 854 g of water you are able to increase its temperature from 19 degrees C to 21 degrees C. Find the increase in the water's entropy
The label on a commercially purchased radioactive sample gives its activity as 16 µCi. The half-life of the sample is 60 days. How old is the sample
A 8.7cm diameter circular loop of wire is in a 0.50T magnetic field. The loop is removed from the field in 0.28 sec, What is the average induced emf
In order better to map the surface features of the Moon, a 305-kg imaging satellite is put into circular orbit around the Moon at an altitude of 1.21 × 102 km. What is the Gravitational Potiential Energy
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