Clovis wants to lose weight. Clotilde tells him that he will be thin enough for her if he travels past her at 0.600c. If the distance she sees from the front of his stomach to his back is then 24.0 cm, what distance in cm does she see when he is standing still?
a. 15.4
b. 19.2
c. 24.0
d. 30.0
e. 37.5
d
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In a single-pass counterflow heat exchanger, 1.25 kg/s of water enter at 15°C and cools 2.5 kg/s of an oil having a specific heat of 2093 J/(kg K) from 95°C to 65°C. If the overall heat transfer coefficient is 280 W/(m2 K), determine the surface area required.
GIVEN
• Water cooling oil in a single-pass counterflow heat exchanger
• Water flow rate ( m w)= 1.25 kg/s
• Oil flow rate ( m o)= 2.5 kg/s
• Oil specific heat (cpo) = 2093 J/(kg K)
• Water inlet temperature (Tw, in) = 15°C
• Oil temperature
? To, in = 95°C
? To, out = 65°C
• Overall heat transfer coefficient (U) = 280 W/(m2 K)
FIND
• The surface area (A) required
SKETCH
PROPERTIES AND CONSTANTS
the specific heat of water (cpw) = 4187 J/(kg K)
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Indicate whether the statement is true or false
A 0.140-kg baseball is dropped and reaches a speed of 1.20 m/s just before it hits the ground and bounces. It rebounds with an upward velocity of 1.00 m/s. What is the change of the ball's momentum during the bounce?
A) 0.0280 kg ? m/s upwards B) 0.0280 kg ? m/s downwards C) 0.308 kg ? m/s upwards D) 0.308 kg ? m/s downwards E) 0.000 kg ? m/s