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A mountain climber wears down clothing 3.29 cm thickwith total surface area 1.66 m2. The temperature at thesurface of the clothing is -20.2°C and at the skin is32.8°C. Determine the rate of heat flow by conduction through the clothing assuming it is dry and that the thermal conductivity,k, is that of down.
Determine the rate of heat flow by conduction through the clothing assuming the clothing is wet, so that k is that of water and the jacket has matted down to 0.472 cm thickness.
An object 5cm tall is placed halfway between the focal point and the center of curvature of a concave spherical mirror of radius 30cm. Determine the location and magnification of the image.
A spinning object has a moment of inertia of 1.6 kg*m2. It is rotating at a rate of 1 rad/s. If the moment of inertia increases to 3 kg*m2, what is its new rotational velocity
In a diffraction experiment a point (pinhole) source of wavelength 600 nm is to be used. Determine whether Fresnel or Fraunhofer diffraction applies
A man stands on the roof of a 19.0 -tall building and throws a rock with a velocity of magnitude 30.0 at an angle of 42.0 above the horizontal. find the max height above the roof reached by the rock
What is the average value of the orbital angular momentum, L, for the hydrogen atom if the electron is in the 3d orbital? Note that the average value of L can be written as = ^(1/2).
A 60-kg bungee jumper has fallen far enough that her bungee cord is beginning to stretch and resist herdownward motion. Find the force (magnitude and direction) exertedon her by the bungee cord at an instant when her downwardacceleration has a mag..
a. how much 235-u is consumed per year in gy to produce enough electricity to continuously run a 100-w light bulb?b.
A conducting bar rests on two parallel horizontal rails 50 cm apart forming a square area. The resistance of the bar and the rails is assumed to be constant and equal to 0.05 ??. What is the maximum value of the force acting on the bar during that ..
A 5.0-cm-diameter coil has 20 turns and a resistanceof 0.50 ohms. A magnetic field perpendicular to the coil is B =0.02t + 0.010t^2, where B is in tesla and tis in seconds. Find an expression for the induced current I(t)as a function of time.
A body is suspended vertically from an ideal spring of spring constant 3.4 N/m. The spring is initially in its relaxed position. The body is then released and oscillates about its equilibrium position. The motion is described by the following equa..
An astronaut who is repairing the outside of her spaceship accidently pushes away a 98.9-cm-long steel rod, which flies off at 10.5 m/s, never to be seen again. As it happens, the rod is oriented perpendicularly to the magnetic field in that region o..
Find the pressure increase in the fliuid in a syringe when anurse applies a force of 42N to the syringe's circular piston,which has a radius of 1.1cm
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