The number of neutrinos in the universe is greater than all the protons, neutrons, and electrons combined
Indicate whether the statement is true or false
TRUE
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A simply supported beam (L 5 4.5 m) with rectangular cross section (b 5 95 mm, h 5 280 mm) supports uniform load q 5 25 kN/m. The ratio of the magnitudes of the principal stresses (?1/?2) at a point a 5 1.0 m from the left support and distance d 5 100 mm up from the bottom of the beam is approximately:
(A) 9
(B) 17
(C) 31
(D) 41
Einstein's theory of relativity tells us that travelers who make a high-speed trip to a distant star and back will
A) age more than people who stay behind on Earth. B) have more fun than people who stay behind on Earth. C) age less than people who stay behind on Earth. D) never be able to make the trip within their lifetimes.
A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface. As the speed of the mass increases at a constant acceleration, the power delivered to it by the force:
a. remains the same. c. decreases. b. increases. d. doubles every 4.0 seconds.
Venus and Mars probably evolved differently from Earth because:
A) they are slightly bigger than Earth. B) they are more massive than Earth. C) they have thicker atmospheres than the Earth. D) they formed sooner than Earth. E) they orbit at different distances from the Sun.