A 5.0 cm focal length lens is used as a magnifier. Assuming a near point of 25 cm, about what magnification is attained?
A. 25
B. 10
C. 60
D. 1.2
E. no value given is within 2 of an appropriate answer
C. 60
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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
A star (no matter what its mass) spends most of its life:
A) as a protostar. B) as a main sequence star. C) as a planetary nebula. D) as a red giant or supergiant. E) as a T Tauri variable star.
A charge is placed on a spherical conductor of radius r1. This sphere is then connected to a distant sphere of radius r2 (not equal to r1) by a conducting wire. After the charges on the spheres are in equilibrium,
A.
B.
C.
D.
.E.
.The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. An astronaut's life support backpack weighs 250 lb on Earth. What does it weigh on the Moon?
a. 1 500 lb b. 250 lb c. 256 lb d. 41.7 lb e. 244 lb