This graph plots planetary mass on the horizontal axis and planetary radius on the vertical axis. Which of the four points marked by one of the bold numbers 1 through 4 represents a planet that has about the same composition as Earth but is larger in both size and mass?
A) Point 1
B) Point 2
C) Point 3
D) Point 4
C) Point 3
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The frequency of a simple pendulum does NOT depend on
A) its mass. B) its length. C) the acceleration due to gravity. D) all of the above E) none of the above
Unused engine oil with a 100°C inlet temperature flows at a rate of 0.25 kg/sec through a 5.1-cm-ID pipe that is enclosed by a jacket containing condensing steam at 150°C. If the pipe is 9 m long, determine the outlet temperature of the oil. Also at what length of the pipe would the oil temperature be at 1100C?
GIVEN
• Unused engine oil flows through a pipe enclosed by a jacket containing condensing steam.
• Oil flow rate, m
= 0.25 kg/s.
• Oil inlet temperature, Tb,in = 100°C.
• Inner or inside diameter of pipe in which oil flows, D = 5.1 cm = 0.051 m.
• Length of heated pipe (heated by condensing steam) in which oil flows, L = 9 m.
• Temperature of condensing steam, Ts = 150°C.
FIND
• Temperature of oil, Tb,out, at the outlet of the 9-m-long heated pipe.
• Length of pipe at which oil temperature will be 1100C.
ASSUMPTIONS
• Steady-state flow of oil and its heating by the condensing steam in the outer jacket.
• The temperature of condensing steam is constant and uniform across the length of pipe.
• The thermal resistance of the pipe is negligible, and hence the inside surface temperature of the
pipe is Tw = Ts, this represents a uniform pipe surface temperature condition.
SKETCH
PROPERTIES AND CONSTANTS
for unused engine oil at Tb,in = 100°C
Density, ? = 840.0 kg/m3
Thermal conductivity, k = 0.137 W/(m K)
Absolute viscosity, ?b = 17.1 × 10–3 (Ns)/m2
Prandtl number, Pr = 276
Specific heat, cp = 2219 J/(kg K)
At the pipe surface temperature of 150°C, the absolute viscosity ?s = 5.52 × 10–3 (Ns)/m2
Comets were likely a major agent in bringing both water and organic molecules to the surface of the early Earth
Indicate whether the statement is true or false
If you toss a ball straight upward at 40 m/s, with no air resistance it returns to you at a speed of
A) zero. B) 10 m/s. C) 40 m/s. D) more than 40 m/s.