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A student is trying to decide what to wear. His bedroom is at 17.0°C. His skin temperature is 36.0°C. The area of his exposed skin is 1.46 m2. People all over the world have skin that is dark in the infrared, with emissivity about 0.912. Find the net energy loss from his body by radiation in 10.7 min.
What is the volume flow rate through the smaller pipe? answer in m^3/ second.
By how much does the potential energy of a 15.0-kg child increase. Find v0.
A ferry boat transports tourists among three islands. It sails from the first island to the second island, 4.7 km away, in a direction 37.0° north of east. It then sails from the second island to the third island in a direction 69.0° west of north..
A rigid steel frame above the street intersection supports standard traffic lights, each of that is hinged to hang immediately below frame. A gust of wind sets light swinging in a vertical plane. Find out order of magnitude of its period. Situatio..
Is kinetic energy consumed in the third type of collision studies? Classify the three collision kinds as elastic, inelastic, or completely inelastic.
The Apollo Lunar Module was used to create the transition from the spacecraft to the moon's surface and back. Consider the similar module for landing on the surface of Mars. Use conservation of mechanical energy to answer these questions.
A certain star is 14 million light-years from Earth. The intensity of the light that reaches Earth from the star is 4.00 x 10-21 W/m2. At what rate does the star radiate EM energy.
Dan is gliding on his skateboard at 4 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 6 m/s (as measured by an observer on the ground). Dan's mass is 50 kg and the skateboard's mass is 7 kg. How fast is Dan going..
How much work is done by an applied force that moves two charges of +5.0 µC that are initially very far apart to a distance of 4.6 cm apart?
A 1050 kg car carrying four 84 kg people travels over a rough "washboard" dirt road with corrugations 4m apart which causes the car to bounce on its spring suspension. The car bounces with maximum amplitude while its speed is 24km/h. The car now s..
Using the capacitance determined in part (a),which equals 21 micro F, compute the current in the circuit 6.6 ms after the switch is closed. Assume that the capacitor is uncharged initially and that the emf of the battery is 9.0 {rm V}. Resistance= ..
A string vibrates in five segments to a frequency of 460Hz. (a) what is its fundamental frequency? (b) What frequency will cause it to vibrate in three segments.
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