A two-shell-eight-tube-pass heat exchanger condenses 3 kg/s of ammonia at 45ºC using 65 kg/s of water at 20ºC. If the ammonia enters as saturated vapor, leaves as saturated liquid, and has a heat of vaporization of 1078 kJ/kg, determine (a) outlet water temperature and (b) heat exchanger effectiveness.
What will be an ideal response?
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Increasing the aperture on a camera
A. reduces the depth of field and requires a longer exposure time. B. reduces the depth of field and requires a shorter exposure time. C. increases the depth of field and requires a longer exposure time. D. increases the depth of field and requires a shorter exposure time.
To catch a fast-moving ball, you extend your hand forward before contact with the ball and let it ride backward in the direction of the ball's motion. Doing this reduces the force of contact on your hand principally because the
A) force of contact is reduced. B) relative velocity is less. C) time of contact is increased. D) time of contact is decreased. E) none of the above
Astronomers consider the Solar System's Kuiper belt extending beyond the orbit of Neptune as an example of an old debris disk
a. True b. False Indicate whether the statement is true or false
While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 watts during a race, how fast is the person running? Assume a running step is 1.5 m long