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If you lie on the ground at night with no cover, you get cold rather quickly. Much of this is due to energy loss by radiation. At night in a dry climate, the temperature of the sky can drop to -40 degrees C. If you are lying on the ground with thin clothing that provides little insulation, the surface temperature of your skin and clothes will be about 30 degrees C.
Estimate the net rate at which your body loses energy by radiation to the night sky under these conditions.
Estimate the number of drops of water in all the oceans on earth. You will need to use the facts that the oceans cover about 2/3 of the earth's surface and are about 4000 m deep on average
A m = 2.6 kg object moving at v = 16 m/s collides with a stationary 2.0 kg object, how far along the inclined plane will the combined system travel
electric companies supply the area homes with 1 kiolwatt of power for one hour for an average cost of 8.5 cents. a
A uniform meter stick with a mass of 205 g is supported horizontally by two vertical strings, one at the 0 cm mark and the other at the 90 cm mark. what is tension on the string at the 0 cm mark and at the 90 cm mark.
A ball of mass 0.300kg that is moving with a speed of 5.4m/s collides head-on and elastically with another ball initially at rest. Calculate the velocity of the target ball after the collision
Unpolarized light of intensity I0 is incident on three polarizing filters. The axis of the first is vertical, What light intensity emerges from the third filter
You can excite waves in a string of length 1.142 m fixed at both ends. You started from an arbitrarily low frequency and increased it slowly. What is the speed of the wave in the medium in m/s
The second-order fringe of 610 nm light is observed at an angle of 12° when the light falls on two narrow slits. at what angle would we expect it to be observed
A 685 kg car stopped at an intersection is rear-ended by a 1470 kg truck moving with a speed of 12.5 m/s. find the final speed of both vehicles after the collision
A 2.90 H coil with a resistance of 6.41×101 ? is in series with a 1.14×103 ? resistor. What is the peak value of the potential difference across the coil
A 3.9 kg block originally at rest is pulled to the right along a horizontal, frictionless surface by a constant, horizontal force of 18 N.
Pacemaker Batteries Pacemakers designed for long-term use commonly employ a lithium-iodine battery capable of supplying 0.42A-h of charge. what is the expected lifetime of the device
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