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At a tea party, a coffeepot and a teapot are placed upon the serving table. The coffeepot is a shiny silver-plated pot with emissivity of 0.30; the teapot is ceramic and has an emissivity of 0.55. Both pots hold 1.00 L of liquid at 98° C when the party begins. If the room temperature is at 25° C, what is the rate of radiative heat loss from the two pots? [Hint: To find the surface area, approximate the pots with cubes of similar volume.]
A cannon fires up at an angle of 30 degrees above the horzontal with a muzzle velocity of 40 m/s. How far from the base of the wall dos the cannon ball travel
A neutral particle moving with velocty, v, decays into two photons moving with angles, a1=30 degrees and a2=60 degrees with respect to the intial velocty of the particle. Find velocty v.
A small block of mass 0.97 kg slides without friction on a horizontal table. Initially it moves in a circle of radius R0 = 0.52 m with a speed 1.3 m/s. What is the final speed of the block
A siren emitting a sound of frequency 1200 Hz. moves away from you toward a cliff at a speed of 16 m/s. What is the frequency (in Hz.) of sound you hear reflected off the cliff
Tarzan, who weighs 900N, swings from a cliff at the end of a 40.0 m vine that hangs from a high tree limb, What is the magnitude of the tension on the vine
An 8300-pF capacitor holds plus and minus charges of 1.35×10?7C. What is the voltage across the capacitor
Water flows through a 4 cm diameter pipe at 4 m/s and with a gauge pressure of 2 atm. what will be the pressure in the narrower pipe
A glass flask whose volume is 1000cm3 at a temperature of 0.500?C is completely filled with mercury at the same temperature. compute the coefficient of volume expansion of the glass
An aluminum cup contains 225 g of water and a 40 g copper stirrer, all at 27°C. A 490 g sample of silver at an initial temperature of 90°C is placed in the water. Calculate the mass of the aluminum cup
What is the minimum rate of rotation, in revolutions per minute, required for the spheres to contact the cylinder wall
High-speed stroboscopic photographs show that the head of a 240-g golf club is traveling at 52 m/s just before it strikes a 46-g golf ball at rest on a tee. Find the speed of the golf ball just after impact
An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. evaluate the electric field between the plates
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