Shell-and-tube heat exchanger is used to cool oil (ch 2.2 kj/kg ? k) from 110°c to 65°c. the heat exchanger has two shell passes and four tube passes. the coolant (cc 4.20 kj/kg ? k) enters the shell at 20°c and leaves the shell at 42°c. for an overall tube-side heat-transfer coefficient of 1200 w/m2 ? k and an oil flow of 11 kg/s, determine a. the coolant mass flow rate b. the required surface area in the exchanger

Atelevision set that has been running for a while heats up even the air around it. which two laws of thermodynamics could be used to analyze this scenario

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

One hazard of space travel is debris left by previous missions. there are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. calculate the force exerted by a 0.110 mg chip of paint that strikes a space shuttle window at a relative speed of 5.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10-8 s. such a collision chipped the window of the ill-fated challenger in june 1983, causing $50,000 of damage.