What is the net force inward acting on a spherical bathysphere of diameter 2.00 m at an ocean depth of 1000 m? (The pressure inside the bathysphere is, hopefully, 1 atm.) ?sea water = 1.02 × 103 kg/m3.
A. 1.26 × 104 N
B. 1.26 × 106 N
C. 1.26 × 108 N
D. 1.26 × 1010 N
E. 1.26 × 102 N
Answer: C
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A simple beam (L 5 9 m) with attached bracket BDE has force P 5 5 kN applied downward at E. The bending moment just right of B is approximately:
(A) 6 kN?m
(B) 10 kN?m
(C) 19 kN?m
(D) 22 kN?m
The pressure at the bottom of a glass filled with water (? = 1 000 kg/m3) is P. The water is poured out and the glass is filled with ethyl alcohol (? = 806 kg/m3). The pressure at the bottom of the glass is now
1.smaller than P. 2.equal to P. 3.larger than P. 4.indeterminate.
Astronomers think most galaxy interactions took place at redshifts of greater than 1 because:
A) stars were bigger. B) galaxies were bigger. C) galaxies were smaller. D) clusters were more diffuse. E) clusters were more compact.
What property of a molecular cloud does not counteract gravitational contraction?
A) thermal pressure B) turbulent motions C) magnetic fields D) fragmentation