A hole is poked through the metal side of a drum holding water. The hole is 28 cm below the water surface. What is the initial speed of outflow?
a. 1.9 m/s
c. 3.2 m/s
b. 2.3 m/s
d. 3.5 m/s
B
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Galileo's telescopic discoveries of mountains on the moon and spots on the sun were controversial because they suggested that the sun and moon
a. were the same kind of object. b. were not perfect spheres. c. were inhabited. d. orbited each other. e. did not orbit Earth.
Write an appropriate dimensionless correlation for the average Nusselt number for these data and state any limitations to your equation.
Suppose that the graph below shows measured values of hc for air in forced convection over a cylinder of diameter D plotted on a logarithmic graph of NuD as a function of ReDPr.
GIVEN
Forced convection of air over a cylinder
Experimental data given above
FIND
An appropriate dimensionless correlation for the average Nusselt number
What role did Princeton astronomers play in the research on the Big Bang?
What will be an ideal response?
A straight 10-cm wire bent at its midpoint so as to form an angle of 90° carries a current of 10 A. It lies in the xy plane in a region where the magnetic field is in the positive z direction and has a constant magnitude of 3.0 mT. What is the magnitude of the magnetic force on this wire?
a. 3.2 mN b. 2.1 mN c. 5.3 mN d. 4.2 mN e. 6.0 mN