What is the major problem with the U.S. customary system?
a. It is out of date.
b. Understanding the units does not require knowing English.
c. It has many different unfamiliar units and conversions are difficult.
d. It avoids cumbersome conversions of units.
e. It does not allow conversion to metric units.
c
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A rectangular plate in plane stress is subjected to normal stresses ?x and ?y and shear stress ?xy. Stress ?x is known to be 15 MPa, but ?y and ?xy are unknown. However, the normal stress is known to be 33 MPa at counterclockwise angles of 358 and 758 from the x axis. Based on this, the normal stress ?y on the element in the figure is approximately:
(A) 14 MPa
(B) 21 MPa
(C) 26 MPa
(D) 43 MPa
Mars may have been more Earth-like in the past because
A) its atmosphere was thicker and warmer B) it was rotating more rapidly C) the Sun was dimmer, putting out less solar radiation D) it was not as close to the Sun
The type of mirror that will allow you to see large areas normally hidden from your view is
a. concave. b. convex. c. plane. d. half-silvered. e. Polaroid.
If the Hubble parameter is 25 km/s per million light years, how old is the universe?
A) 10 × 109 y B) 12 × 109 y C) 15 × 109 y D) 20 × 109 y E) 25 × 109 y