A 30 feet high vertical wall is separated from a glass wall parallel to it, as shown. When the wall surface temperature is 85ºF and the glass temperature is 25ºF, estimate the heat transfer between the two surfaces.
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A tsunami, an ocean wave generated by an earthquake, propagates along the open ocean at 700 km/hr and has a wavelength of 750 km. What is the frequency of the waves in such a tsunami?
A) 0.93 Hz B) 0.00026 Hz C) 1.1 Hz D) 6.8 Hz E) 0.15 Hz
The strong nuclear force is the force that holds the protons and neutrons in the nucleus together
Based on the fact that atomic nuclei can be stable, briefly explain how you can conclude that the strong force must be even stronger than the electromagnetic force, at least over very short distances.
A far-sighted student has a near point of 1.0 m. Calculate the focal length (in cm) of the glasses needed so the near point will be normal (25 cm).
A. 72 B. 25 C. 33 D. 100 E. ?33
Why are leaves green and not yellow, for example? Explain
What will be an ideal response?