Which of the following might explain the lack of "water worlds" (planets made mostly of water or other hydrogen compounds) in our own solar system?
A) In our solar system, the solar wind did not clear out gas until relatively late.
B) There was not enough water in our solar system.
C) Small worlds in our solar system formed only close to the Sun, where it was too hot for hydrogen compounds to condense.
D) Water worlds can form only in systems in which all planets have highly elliptical (eccentric) orbits.
Fill in the blank(s) with the appropriate word(s).
A) In our solar system, the solar wind did not clear out gas until relatively late.
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Elastic Collisions: A 50-g ball moving at 10 m/s in the +x direction suddenly collides head-on with a stationary ball of mass 100 g. If the collision is perfectly elastic, what is the velocity of each ball immediately after the collision?
A. -3.3 m/s, +6.7 m/s B. +3.3 m/s, -6.7 m/s C. -6.7 m/s, +3.3 m/s D. +6.7 m/s, -3.3 m/s
A rectangular plate (a 5 120 mm, b 5 160 mm) is subjected to compressive stress ?x 5 24.5 MPa and tensile stress ?y 5 15 MPa. The ratio of the normal stress acting perpendicular to the weld to the shear stress acting along the weld is approximately:
(A) 0.27
(B) 0.54
(C) 0.85
(D) 1.22
The energy released by a certain reaction is enough to totally evaporate 125 kg of water at its boiling point. How much mass was lost during this reaction?
(LF = 334,000 J/kg for water, c = 3.00 × 108 m/s)