Which of the following is a result of Earth revolving around the Sun?
A) The lunar phases
B) The occurrence of day and night
C) The yearly cycle
D) The daily climatic changes
C
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The instruction manual for a hot-wire anemometer states that ‘roughly speaking, the current varies as the one-fourth power of the average velocity at a fixed wire resistance’. Check this statement, using the heat transfer characteristics of thin wire in air and water.
GIVEN • A thin current carrying wire in an air or water stream FIND • Show that the current (I) varies as the one-fourth power of the fluid velocity (V?) at a fixed resistance (ReI) ASSUMPTIONS • Radiative heat transfer is negligible
State the law of reflection
What will be an ideal response?
A single-shell-eight-tube-pass heat exchanger is used in a power plant to preheat 55ºF water to 80ºF by using 190ºF hot water and cooling it to 160ºF. If the overall heat exchanger conductance is 400 Btu/hr?ft^2 ?0F and if 1800 lbm/min of 55ºF water is preheated, determine (a) mass flow of the hot water and (b) surface area of the heat exchanger.
What will be an ideal response?
A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal. The projectile lands on a roof that is 4.00 m height. What is the time when the projectile hits the roof?
A. 1.11 s B. 1.27 s C. 1.33 s D. 1.49 s E. 1.67 s