Avalanche forecasters measure the temperature gradient startfraction dt over dh endfraction , which is the rate at which the temperature in a snowpack t changes with respect to its depth h. a large temperature gradient may lead to a weak layer in the snowpack. when these weak layers collapse, avalanches occur. avalanche forecasters use the rule of thumb that if startfraction dt over dh endfraction exceeds 10 degrees upper c divided by m anywhere in the snowpack, conditions are favorable for weak-layer formation, and the risk of avalanche increases. assume the temperature function is continuous and differentiable. complete parts (a) through (d) below. a. an avalanche forecaster digs a snow pit and takes two temperature measurements. at the surface (hequals0), the temperature is negative 12 degrees upper c. at a depth of 1.7 m, the temperature is negative 3 degrees upper c. using the mean value theorem, what can he conclude about the temperature gradient?
Answers: 3
Physics, 22.06.2019 07:50, singhmanny3526
The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.
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Physics, 22.06.2019 10:40, rainbowboi
As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.
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Physics, 22.06.2019 11:00, stankyweezle
A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n
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Avalanche forecasters measure the temperature gradient startfraction dt over dh endfraction , which...
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