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A human wearing cloths has about 1.0 m^2 of exposed skin. Dry skin has an efficiency of about 20% when radiating heat. How much power does a typical human loose due to radiation (in calories/ day)?
An X-ray photon scatters from a free electron at rest at an angle of 175%u2218 relative to the incident direction, Determine the energy of the incident photon
You have a battery marked 6.00 V.When you draw a current of 0.245 A from it, the potential difference between its terminals is 5.13 V
A wire 3.00 m long and 0.450 mm2 in cross-sectional area has a resistance of 39 at 20°C. what is the temperature coefficient of resistivity
If a mass m_a = 2m has intial velocity 4m/s and mass m_b = m is initially at rest, they undergo elastic collision. Calculate their final velocities after the collision
A 28.0-kg block is connected to an empty 2.46-kgbucket by a cord running over a frictionless pulley. Calculate the mass of sand added to the bucket
A thin film of oil (n = 1.29) is located on smooth, wet pavement. What is the minimum thickness of the oil film
The brick wall of a building has dimensions of by and is thick. How much heat ?ows through the wall a period when the average inside and outside temperatures are, in that order.
Under ambient conditions (T=300K), the intrinsic electron concentration of silicon is 1.45*10^10 cm^-3. Calculate the band gap energy of the semiconductor
how much work was done by her force acting on the car
TV-reception antennas for VHF (channels 2 through 13) are constructed with cross wires supported at their centers, What is the frequency for channel 4
A block of iron has the dimensions of 3.00 cm x 3.00 cm x 3.00 cm. It has a mass of 213 g. When placed in water, the block sinks. What volume of water did it displace.
A camera has a lens with a focal length of 25.6 cm. how far from the film should the lens be placed
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