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A concrete slab is 11.4 cm thick and has an area of 4.3 m2. Electric heating coils are installed under the slab to melt the ice on the surface in the winter months. What minimum power must be supplied to the coils to maintain a temperature difference of 17.6°C between the bottom of the slab and its surface? Assume all the energy lost is through the slab.
Considering Wiener's experiment (fig. 7.14) in monochromaticlight of wavelength 550nm, determine the number of bright bands per centimeter that will appear on it
You have a grindstone ( a disk) that is 84.0 kg, has a .307-mradius, and is turning at 104.0 rmp, How many turns wil the stone make before coming to rest
A bowling ball, which can be treated as a solid sphere with a diameter of 21.6 cm and a weight of 33 kg, The kinetic energy of the bowling ball is
A 4.80 long, 600 steel beams extends horizontally from point where it has been bolted to the framework of a new building under construction. A 75 construction worker stands at the far end of beam.
An ideal gas is in contact with a heat reservoir to that it remains at a constant temperature of 300.0 K. How much heat flows between the gas and the heat reservoir
A 1700 kg car travelling at a speed of 15m/s skids to a halt on wet concrete where f_k =.5. How long is the cars skid marks.
Two protons are released from rest, one from location 1 and another from location 2. When these two protons reach location 3, what is the electric potential at location 3
a pendulum of length l and mass m hangs from a bead of mass m that moves frictionlessly along the curve yx4 . use y the
a large 6.0g hailstone of ice at 0.0 celsius falls 150m and undergoes a completely inelastic collision with the earth. what is the speed of the stone as it hits the earth
In the figure below, a particle moves along a circle in a region of uniform magnetic field of magnitude B = 3.50 mT. What is the radius of the circle
A 5 L rigid (constant volume) container holds 0.60 moles of helium at an initial temperature of 80 oC, How many moles of gas will be in the container at the final temperature
the intensity of a laser beam is 450 wm2. what is the rms value of the electric field of this laser beam? careful-rms
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