A large stratified brine/water pond has a surface temperature of 140ºF and air at 70ºF moves across the pond at 15 mph. Estimate the convective heat transfer at the pond surface per unit area.
What will be an ideal response?
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The eye focuses by
A. moving the lens. B. moving the retina. C. moving both the lens and the retina. D. changing the focal length of the lens. E. changing the index of refraction of the vitreous fluid.
An astronaut measures her mass by means of a device consisting of a chair attached to a large spring. The period of oscillation she undergoes when set into motion is used to determine her mass. If her mass together with the chair is 172 kg, and the spring constant is1250 N/m, what is the time required for her to undergo 10 full oscillations?
A. 3.7 s B. 8.6 s C. 170 s D. 23 s
A block is pushed across a rough horizontal surface from point A to point B by a force (magnitude P = 5.4 N) as shown in the figure. The magnitude of the force of friction acting on the block between A and B is 1.2 N and points A and B are 0.5 m apart. If the kinetic energies of the block at A and B are 4.0 J and 5.6 J, respectively, how much work is done on the block by the force P between A and B?
A. 2.7 J B. 1.0 J C. 2.2 J D. 1.6 J E. 3.2 J