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An electric heater with the total surface area of 0.25 m2 and emissivity 0.75 is in a room where the air has a temperature of 20°C and the walls are at 10°C. When the heater consumes 500 W of electric power, its surface has a steady temperature of 120°C. Determine the temperature of the heater surface when it consumes 700 W. Solve the problem
(a) assuming negligible radiation and
(b) taking radiation into consideration. Based on your results, comment on the assumption made in part (a)
Superman attempts to drink water through a very longstraw. With his great strenth he achieves maximum possible suction.The walls of the tubular straw don't collapse. Find the Maxium height through which he can lift the water
In the deep space between galaxies, the density of atoms is as low as 106 atoms/m3, and the temperature is a frigid 3.3 K. What is the pressure?
A cylindrically shaped piece of collagen is being stretched by a force that increases from 0 to 3.0 x 10^-2 N. How much work is done by the variable force that stretches the collagen
A 0.73-kg magnetic target is suspended on a string. A 0.025-kg magnetic dart shot horizontally, strikes the target head-on. The dart and the target together acting like a pendulum, swing 12.0 cm above the initial level before instantaneously coming t..
An image of the moon is focused onto a screen using a converging lens of focal length f= 36.3 cm. The diameter of the moon is 3.48×106 m, What is the diameter of the moon's image
A 2.7 kg object is attached to a horizontal spring of force constant k = 3.6 kN/m. The spring is stretched 10 cm from equilibrium and released. Find its total energy
if a negatively charged particle enters a region of uniform magnetic field which is perpendicular to the particles
A cord is 20cm long, four complete waves fit along its length when vibrated 30 times per second for the waves on the cord. What is the wavelength? What is the frequency? What is the speed?
Two gas cylinders are identical. One contains the monatomic gasargon (Ar), Determine the ratio of the average kinetic energy of a krypton atom to the average kinetic energy ofan argon atom
A thin, uniformly charged spherical shell has a potential of 646 Volt on its surface. Outside the sphere, at a radial distance of 15 centimeter from this surface, the potential is 438 Volt. Compute what the total charge on the sphere
a flute player tunes her instrument when the air and the flute is cold. as she plays the flute and the air inside it
A 1.90 kilogram ball is attached to the bottom end of a length of fish line with a breaking strength of 8 lb (35.6 N). Determine at what angle θ (measured from the vertical) will the fish line break
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