A hoop, a solid sphere, and a solid cylinder each have the same mass, radius, and initial speed and are going up the same inclined plane. Which one goes the farthest?
a. the hoop b. the sphere
c. the cylinder d. All go the same distance.
a
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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
Study this H-R diagram. What is the spectral type of the star Sirius? (The red arrow helps you locate Sirius on the diagram.)
A) A B) 102 C) main sequence D) blue
A particle moves along a circular path having a radius of 2.0 m. At an instant when the speed of the particle is equal to 3.0 m/s and changing at the rate of 5.0 m/s2, what is the magnitude of the total acceleration of the particle?
A. 7.5 m/s2 B. 6.0 m/s2 C. 5.4 m/s2 D. 6.7 m/s2 E. 4.5 m/s2
Based on the observed amount of deuterium in the universe, we can conclude that
A) neutrons outnumber protons 7 to 1 in the universe. B) most of the deuterium that was created during the era of nucleosynthesis has since been destroyed. C) we live in a critical-density universe. D) the density of ordinary (baryonic) matter is about 5 percent of the critical density. E) ordinary (baryonic) matter makes 75 percent of the mass of the universe.