According to Newtonian physics, an object with no forces acting on it must

A) be accelerated, with an unchanging acceleration.
B) either be at rest or have constant velocity.
C) eventually come to rest.
D) be at rest.
E) fall.


B

Physics & Space Science

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Hot water is used to heat air in a double pipe heat exchanger as shown in the following sketch. If the heat transfer coefficients on the water side and on the air side are 550 W/(m2K) and 55 W/(m2 K), respectively, calculate the overall heat transfer coefficient based on the outer diameter. The heat exchanger pipe is 5 cm, schedule 40 steel (k = 54 W/m K), with water inside.

GIVEN
• A double pipe heat exchanger with water in inner tube and air in the annulus
• Heat transfer coefficients
? Water side ih = 550 W/(m2 K)
? Air side oh = 55 W/(m2 K)
• Inner pipe: 5 cm, schedule 40 steel
• Pipe thermal conductivity (k) = 54 W/(m K)
FIND
• The overall heat transfer coefficient based on the outer diameter (Uo). ASSUMPTIONS
• Uniform heat transfer coefficients
SKETCH

PROPERTIES AND CONSTANTS
for 5 cm, schedule 40 pipe
? Outside diameter (Do) = 2.375 in = 6.033 cm=0.0603 m
? Wall thickness (t) = 0.154 in=0.39 cm=0.0039 m

Physics & Space Science

A hotter star is brighter than a cooler star of the same size. Assume both are typical stars

a. True b. False Indicate whether the statement is true or false

Physics & Space Science

Which way does the Sun appear to move along the ecliptic from day to day?

What will be an ideal response?

Physics & Space Science

A pilot punches the throttle lever forward, changing his speed from 0 m/s to 40 m/s in 7 seconds. The acceleration of the racecar is _________

Fill in the blank(s) with correct word

Physics & Space Science