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At a fabrication plant, a hot metal forging has a mass of 78 kg and a specific heat capacity of 430J/(kg·°C). To harden it, the forging is immersed in 710kg of oil that has a temperature of 32°C and a specific heat capacity of 3000 J/(kg·°C). The final temperature of the oil and forging at thermal equilibrium is47° C. Assuming that heat flows only among the forging and the oil, decide the initial temperature of the forging.
a hollow ball rolls along a horizontal surface at 3.7 ms when it encounters an upward incline. if it rolls without
Suppose a heat engine pulls 3.37×104 J of work from the hot reservoir and 7.52×103 J of that energy is used to perform work. How much energy is rejected by the engine? (This energy is "exhausted" to the cold reservoir.) What is the efficiency of the ..
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
You pull downward with a force of 30N on a rope that passes over a disk-shaped pulley of mass 1.2kg and radius 0.075m, Find the linear acceleration of the 0.69kg mass.
An LC circuit constructed of a 1 mF capacitor and a 1 micro inductor is set in oscillation, Determine the charge on the capacitor at t = 1.0 s
A defibrillator is used during a heart attack to restore the heartto its normal beating pattern (see Section 19.5). A defibrillatorpasses 22 A of current through thetorso of a person in 1.7 ms. How much charge moves during this time?
A 76-kg ice hockey player standing on a frictionless sheet ofice throws a 5.6-kg bowling ball horizontally. With what speed does the hockey player recoil
a 9.05 kg monkey is hanging by one arm from a branch and swinging on a vertical circle. as an approximation assume that
A 60 skydiver can be modeled as a rectangular "box" with dimensions 21 41 1.8. What is his terminal speed if he falls feet first
A sprinter explodes out of the starting block with an acceleration of +4.4 m/s2, which she sustains for 1.2 s. What is her velocity at the end of the race
the nucleus of a atom an isotope of the element xenon with mass 125 is 6.0 in diameter. it has 54 protons and charge
two identical point charges q 7.60 x 10-6 c are fixed at diagonally opposite corners of a square with sides of length
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