Newton's first law of motion was very similar to descriptions of motion proposed by _______________
Fill in the blank(s) with correct word
Galileo
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As material leaves an expanding star and begins to fall into a white dwarf close companion
a. an accretion disk will form around the white dwarf. b. the material will cool off because it begins to move at high velocities. c. the material will fall directly straight onto the surface of the white dwarf. d. the white dwarf will produce a protostar. e. the white dwarf's iron core will collapse.
Estimate the heat transfer coefficient for liquid sodium at 540°C flowing over a 10-row staggered-tube bank of 2.5 cm-diameter tubes arranged in an equilateral- triangular array with a 1.5 pitch-to-diameter ratio. The entering velocity is 0.6 m/s, based on the area of the shell, and the tube surface temperature is 200°C. The outlet sodium temperature is 310°C.
GIVEN
FIND
Estimate the heat transfer coefficient (c h)
ASSUMPTIONS
Steady state
The correlation can be applied to a pitch-to-diameter ratio of 1.5
Tube wall temperature is uniform and constant
SKETCH
PROPERTIES AND CONSTANTS
Density (?) = 847 kg/m3
Specific heat (c)=1285 W/(kg K)
Thermal conductivity (k) = 70.1W/(m K)
Kinematic viscosity (?)= 2.92*10-7 m2/s
Prandtl number (Pr) = 0.0047
A thin-walled cylindrical tank, under internal pressure p, is com-pressed by a force F 5 75 kN. Cylinder diameter is d 5 90 mm and wall thickness t 5 5.5 mm. Allowable normal stress is 110 MPa and allowable shear stress is 60 MPa. The maximum allowable internal pressure pmax is approximately:
(A) 5 MPa
(B) 10 MPa
(C) 13 MPa
(D) 17 MPa
While traveling along a straight interstate highway you notice that the mile marker reads 260. You travel until you reach mile marker 150 and then retrace your path to the mile marker 175. What is the magnitude of your resultant displacement from mile marker 260?
1.110 miles 2.135 miles 3.260 miles 4.85 miles