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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
A converging lens (f = 14.6 cm) is located 31.4 cm to the left of a diverging lens (f = -7.91 cm), Find the overall magnification
Suppose Q and nQ are charges that are seperated from origin by -L and oL and the origin and that the origin as at a point of electrostatic equilibrium between them
If 1800J of heat are added to a 190-g object, its temperature increases by 10o C. What is the heat capacity of this object
Two point charges Q1, and Q2 are place exactly on the x axis at -x1. A second particle Q2 is placed at +x2 on the positive x axis. What is the total E field at the origin
A car takes a sharp turn on a road. Which of the following provides the centripetal force on the car? The weight of the car, frictional force, tangential acceleration, or gravitational force?
A 1.50 ? 103-kg car starts from rest and accelerates uniformly to 16.5 m/s in 12.4 s. Find the average power developed by the engine
An astronaut weighs 7*10^2 N on the surface of the earth (M earth=5.98*10^24 kg). What is her weight 7.70*10^6 m above the earth.
A bomb at rest at the origin of an xy-coordinate system explodes into three pieces. Just after the explosion, one piece, of mass 2.0 kg, what is the magnitude of the velocity of the third piece
A 7.9-N force pulls horizontally on a 1.6-kg block that slides on a smooth horizontal surface. What is the acceleration of the blocks
Consider the particle that is constrained to move along a curve described by y = x4. Find the equation of motion for small displacement about equilibrium
A lamp which is 12.0 cm tall is 264.0 cm in front of a converging lens which has a focal length of 80.0 cm, What is the image distance for this lamp and lens combination
A 0.200 kg hammer is moving horizontally at 8.50 m/s when it strikes a nail and comes to rest after driving it 1.00 cm into a board. Calculate the duration of the impact
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