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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.
illustrate what minimum projection angle would achieve this result? What maximum pro- jection angle would achieve this result?
You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -13.10 eV. What is the energy of the first photon emitted
Models of torpedoes are sometimes tested in a horizontal pipe of flowing water, much as a wind tunnel is used to test model airplanes. With what speed must the water flow in the part of the pipe
The gearshift lever AB for the transmission of a sports car has position vector r whose line of action passes through points A and B. The driver applies the force F to the knob B of the lever to shift gears. Find out the magnitude of the component..
A circular loop in the plane of the paper lies in a 0.80 T magnetic field pointing into the paper. If the loop's diameter changes from 21.0 to 7.8 in 0.19. what is the direction of the induced current
Two masses, m1= 3.32 kg and m2= 5.00 kg are on a horizontal frictionless surface and they are connected together with a rope, What is the acceleration of the whole system, when this maximum force is appiled
The Sun revolves around the center of the Milky Way Galaxy at a distance of about 30,000 light-years from the center, how many stars would there be in our Galaxy
Find A (Vector potential of the Magnetic dipole) on a diagonal of a square side S and of current I at a distance Sqrt(2)S from the corner.
A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.80{Hz}. Illustrate what is the mass of the fish, ignoring the mass of the spring.
A stone used to grind wheat into flour is turned through 12 revolutions by a constant force of 21.6 N applied to the rim of a 9.2-cm-radius shaft connected to the wheel
At time a grinding wheel has an angular velocity of 22. It has a constant angular acceleration of 28.0 until a circuit breaker trips at time = 1.60 . From then on, the wheel turns by an angle of 438 as it coasts to a stop at constant angular decel..
A microscope with an eyepiece lens of focal length 1.90 cm and an objective lens of focal length 1.15 cm is used to examine a section of the brain of a sacrificed rat. The distance between the lenses of the instrument is 24.0 cm and final image is vi..
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