A mercury-in-glass thermometer reads 20ºC when hanging outside in the shade on a calm summer day. Another thermometer hangs in a sunny location and registers 45ºC. Assuming a convective heat transfer coefficient of 10 W/m^2? K and the emissivity is 0.2 for both thermometers, determine the effective surrounding surface temperature in the sun.
What will be an ideal response?
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Estimate the magnitude of the electric field due to the proton in a hydrogen atom at a distance of 5.29 × 10-11 m, the expected position of the electron in the atom
1.10-11 N/C 2.108 N/C 3.1014 N/C 4.106 N/C 5.1012 N/C
Left undisturbed, the footprints left on the Moon by the Apollo astronauts will likely
A) already have been erased by erosion. B) remain visible for a few more decades. C) remain visible for millions of years. D) remain permanently visible on the Moon.
The bob of a simple pendulum has its maximum kinetic energy at the
A) top of its swing. B) bottom of its swing. C) midpoint between top and bottom. D) at all points along its path of swing.
An airplane pilot experiences weightlessness as she passes over the top of a loop-the-loop maneuver. If her speed is 200 m/s at the time, find the radius of the loop