What are the two major kinds of waves an earthquake produces?
What will be an ideal response?
Answer: Body waves and surface waves. Body waves travel through Earth's interior and surface waves travel on Earth's surface.
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Oort-cloud comets are so far from the Sun that the gravity of neighboring stars can alter their orbits
Indicate whether the statement is true or false
Steam at 1 atm and 100°C is flowing across a 5-cm-OD tube at a velocity of 6 m/s. Estimate the Nusselt number, the heat transfer coefficient, and the rate of heat transfer per meter length of pipe if the pipe is at 200°C.
GIVEN
• Steam flowing across a tube
• Steam pressure = 1 atm
• Steam bulk temperature (Tb) = 100°C
• Tube outside diameter (D) = 5 cm = 0.05 m
• Steam velocity (V) = 6 m/s
• Pipe surface temperature (Ts) 200°C
FIND
(a) The Nusselt number Nu D (b) The heat transfer coefficient h c(c) The rate of heat transfer per unit length (q/L)
ASSUMPTIONS
• Steady state
SKETCH
PROPERTIES AND CONSTANTS
Thermal conductivity (k) = 0.0249 W/(m K) Kinematic viscosity (?) = 20.2 × 10–6 m2/s Prandtl number (Pr) = 0.987 At the tube surface temperature of 200°C, the Prandtl number of the steam (Prs) = 1.00
During summer, the northern polar cap of Mars is made of
A) carbon dioxide ice overlaying water ice B) a layer of carbon dioxide ice C) a layer of water ice D) water ice overlaying carbon dioxide ice
A 100 W lightbulb has an energy efficiency of 5%. It is turned on for one minute. Its total energy output during this minute is
A) 6000 J. B) 300 J. C) 5700 J. D) impossible to determine because we don't know the voltage. E) impossible to determine because we don't know the power.