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As a mechanical engineer, you must design a cooling unit fora new freezer. The enclosure has an inner surface of 6.0m2 and is bounded by walls that are 10 cm thick, with athermal conductivity of .05 W/m*K. The inside must be kept at-10oC in a room that is at 20oC. Themotor for the cooling unit must run no more than 15% of the time. What is the minimum power requirement of the cooling motor?
A pulsed carbon dioxide laser has an energy output of 1.00 J. This energy is released in the form of a 10^9 W pulse of infrared radiation lasting 10^-9 s, Find the equivalent capacitance of the network
A 4.25g bullet traveling horizontally with a velocity of magnitude 375m/s is fired into a wooden block with mass 1.10kg , How fast is the block moving just after the bullet emerges from it
The lenes of a particular set of binoculars have a coating with index of refraction n=1.38, If the lenses refelct a wavelength of 540nm the most strongly, what is the minium thinkcness of the coating
A soft iron bar is sitsting surrounded by two separate loops of wire. The loop on the left, L1, initially has a current flowing clockwise as viewed from the right, What will be direction of magnetic field in soft iron bar
Find the distance(in μm) between the plates of a parallel plate capacitor if, in the dielectriccompletely filling that region, an electric field of magnitude 67.5MV/m gives a potential difference of 34.5 kV between the plates
What is the centripetal force that would be required to keep a 4.0 kg mass moving in a horizontal circle with a radius of 0.80 meters at a speed of 6.0 meters/second?
An object with a charge of -2.6 \mu C and a mass of1.7×10−2 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to itsweight.
A planet of mass m = 7.85 × 1024 kg is orbiting in a circular path a star of mass M = 4.35 × 1029 kg. The radius of the orbit is R = 8.15 × 107 km. What is the orbital period (in earth days) of the planet Tplanet?
A 9.5 gram bullet hits a 5.4 kg block in collision as shown in the figure such that the block is free to rotate as a pendulum. what would be the final height of the block
Find the electric field at the top point of a right circular solid cone of charge Q, uniform density. The cone has a radius a and a height h.
An airplane pilot sets a compass course due west and maintains an airspeed of 213km/h. Find the magnitude of the wind velocity
A beam of light with red and blue components of wavelengths 670 nm and 425 nm, respectively, strikes a slab of fused quartz at an incident angle of 37°. what is the index of refraction of the blue light
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