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Suppose a lake has a layer of ice 11 cm thick on its surface. The top of the ice layer is cooled by the atmosphere to -5.25° C. The lower surface is in contact with water at 0.0° C. The thermal conductivity of ice is 0.004 cal/(s · cm · C°).
(a) At what rate is heat transferred through a 1.5 cm2 area of the ice?
(b) How long will it take to freeze an additional 1.1 mm of ice onto the lower surface of the ice?
A 690 g wood block is at rest on a frictionless table, when a 27 g bullet is fired into it. what was the original speed of the bullet
A thermos contains 159 cm3 of coffee at 93.7 °C. To cool the coffee, you drop two 13.2-g ice cubes into the thermos. What is the final temperature of the coffee
A particular guitar string is supposed to vibrate at 203 Hz, other than it is measured to actually vibrate at 208 Hz. By what percentage must the tension in the string be changed to get the frequency to the correct value.
A 67 kg person sits on a 3.5kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.8 cm in diam. Determine the pressure exerted on the floor by each leg of the chair; Assume the weight is evenly distributed.
An electron confined in a one-dimensional box emits a 400nm photon in a quantum jump from n=1 to n=2. What is the length (L) of the box in nm
Two flat surfaces are exposed to a uniform, horizontal magnetic field of magnitude 0.42 T. When viewed edge-on, Determine the area of the first surface
A 7130-kg car is travelling at 25.8 m/s when the driver decides to exit the freeway by going up a ramp. What is the magnitude of the average drag force exerted on the car
The electron's magnetic moment is known as the "Bohr Magnetron" and has a theoretical value of ?B?eh4?m, where "h" is Planck's constant (h=6.63×10?34 J?s), Calculate the magnetic moment value of the Bohr Magnetron
A parallel-plate air capacitor with a capacitance of 245 has the charge of magnitude 0.1502 on each plate. The plates have the separation of 0.323.
an object of mass 1.00kg travels at 5.0m/s and enters a region of ice where the coefficient of friction is 0.10. determine the distance traveled before coming to a hault
A proton is released from rest at the positive plate of a parallel-plate capacitor. What will be the final speed of an electron released from rest at the negative plate
A computer to be used in a satellite must be able to withstand accelerations of up to 25 times the acceleration due to gravity. What is the minimum amplitude of vibration that must be used in this test
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