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A mountain climber wears a goose down jacket 3.3cm thick with total surface area 1.2m^2 . The temperature at the surface of the clothing is -20C and at the skin is 34 C .
Part A Determine the rate of heat flow by conduction through the jacket assuming it is dry and the thermal conductivity k is that of down. Express your answer using two significant figures. Q/t=_____W
Part B Determine the rate of heat flow by conduction through the jacket assuming the jacket is wet, so k is that of water and the jacket has matted to 0.40 cm thickness. Express your answer using two significant figure. Q/t=_____W
Two spherical objects with a mass of 6.86 kg each are placed at a distance of 3.06 m apart. How many electrons need to leave each object so that the net force between them becomes zero?
compare with the force of gravitational attraction between them.Find the position of the particle after this time.
Two, concentric, thin spherical shells of radii R1 = 31.3 cm and R2 = 39.1 cm are uniformly charged with a total charge Q1 = -56.5 ?C, What is the potential of the outer shell
A krypton laser produces a cylindrical red laser beam 3mm in diameter with 4W of power. What is the light intensity on a wall 5.0 m away from the laser.
three protons are positioned at the corners of an equilateral triangle with sides 2mm in length. What is the leectric field at the enter of one of the edges of the triangle
A certain part of an aircraft engine has a volume of 2.6 ft3. Determine how much weight is saved by using aluminum instead of nickel
A water molecule, which is electrically neutral but has a dipole moment of magnitude p = 6.20·10-30 C m, is 3.20 cm away from a point charge q = +6.90 ?C, Calculate the magnitude of the net force
Parametric study on the effects of activated carbon by calcium chloride activation from bark of calamansi tree on sewage wastewater treatment.
You have just built a house out in the country and it comes to your attention that you need to install a lightning rod. Being naturally curious you ask a hardware salesperson how lightning rods work and they accurately tell you.
Two bars of identical mass are at 32 °C. One is made from glass and the other from another substance. The specific heat capacity of glass is 840 J/(kg · C°).
One runner ran the 100-m dash in 11.9 s. Another runner came in secona at 12.4 s. Assuming that the runners traveled at their average speeds for the entire distance, determine the sepaaration between the two runners when the winner crossed the fin..
A 800kg car pushes a 1800kg truck that has a dead battery. When the driver steps on the accelerator, What is the magnitude of the force of the car on the truck
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