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Find the emissivity of a surface that radiates heat at the same rate that it loses heat through convection when its temperature is 107° C and the surroundings are at 18° C if the convection coefficient is 4.8 W/(m2 · C°).
An air-filled (suppose k=1) parallel-plate capacitor has plates of area 2.30 cm2 separated by 1.50 mm. What is the charge on the capacitor
A long solenoid has 1580 turns in a length of 40.0 cm. What current has to flow through the solenoid in order to generate a magnetic field of 3.45 ?T in its interior
batted straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact with the ball for .050 s, illustrate what is the impulse experienced by the ball.
What is the response to the Naturalist concept that human personality, thought, and emotion are purely chemical and electrical reactions.
A potential difference of 14 V is found to produce a current of 0.39 A in a wire of length 3.1 m with a uniform radius of 0.44 cm. What is the resistivity of the wire
You shoot a cannon with initial velocity 62.3 m/s at an angle 67 degrees with respect to the level field on which the cannon sits. How far does this cannonball go on level ground
In a hot star, because of the high temperature, an atom can absorb sufficient energy to remove several electrons from the atom. Find the wavelengths of the next three spectral lines nearest to the line of longest wavelength
The coordinate system has its origin at the center of the square. A point mass, m, of 4.21·102 g is placed at one corner of the square object, and the assembly is held in equilibrium by positioning the support at position
In a classic clip on America's Funniest Home Videos, a sleeping cat rolls gently off the top of a warm TV set. (Ignore air resistance and consider upward motion to be positive with zero at the top of the TV).
An interstellar spaceship is leaving Earth at a speed of %u03B2 = 0.548 for a deep space expedition. What is the geometric mean of the down-shifted and the up-shifted frequency
wo people start at the same place and walk around a circular lake in opposite directions. How long will it be before they meet
A 8 kg box slides d = 4.2m down the frictionless ramp, after that collides with a spring whose spring constant is 250 N/m. angle is 30 degrees.
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