Consider the following fluids, each with a velocity of V = 5 m/s and a temperature of T inf = 20โ, in cross flow over a 10 mm diameter cylinder maintained at 50โ: atmospheric i) air, ii) saturated water, and iii) engine oil. A) Calculate the rate of heat transfer per unit length, qโฒ, using the ChurchillโBernstein correlation. B) Generate a plot of qโฒ as a function of fluid velocity for 0.5 โค V โค 10 m/s.

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

What causes the formation of ocean currents?