The contact force F between the two cylinders in Problem 3.3 may be expressed in terms of load variable W as:
(A) 1.82W
(B) 2.5W
(C) 2.1W
(D) 1.52W
(D) 1.52W
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Resolution: A camera lens having a 50-mm focal length is set to f/4.0. What is the minimum spacing of two objects located 12 m from the lens if the objects are just barely resolved in the image using light of wavelength 500 nm?
A. 1.66 mm B. 4.72 mm C. 0.024 mm D. 4.9 × 10-5 m E. 0.59 mm
A future use of space stations may be to provide hospitals for severely burned persons. It is very painful for a badly burned person on Earth to lie in bed. In a space station, the effect of gravity can be reduced or eliminated
With what period of rotation would a doughnut-shaped hospital of 200. m radius have to rotate, if persons on the outer perimeter are to experience 1/10 the gravity effect of Earth? A) 91. min B) 1.5 min C) 8.7 min D) 4.6 min E) 0.011 min
The ionization energy for the hydrogen atom is 13.6 eV. What is the energy of a photon that is emitted as a hydrogen atom makes a transition between the n = 6 and n = 4 states?
a. 1.13 eV b. 0.47 eV c. 0.09 eV d. 3.40 eV e. 6.80 eV
Many terrestrial weather patterns have been observed and named, for example, the Southern Oscillation, the Arctic Oscillation/North Atlantic Oscillation, the Pacific Decadal Oscillation, and so on
How are these indices useful in the discussion of weather and climate?