Which statement regarding Einstein's theories is correct?
a. According to special relativity, moving clocks run more slowly than those at rest, and according to general relativity, clocks higher in a gravity field run more quickly.
b. According to special relativity, moving clocks run more quickly than those at rest, and according to general relativity, clocks higher in a gravity field also run more quickly.
c. According to special relativity, moving clocks run more quickly than those at rest, and according to general relativity, clocks higher in a gravity field run more slowly.
d. According to special relativity, moving clocks run more quickly than those at rest, and according to general relativity, clocks higher in a gravity field also run more quickly.
a
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A simply supported steel beam of length L 5 1.5 m and rectangu-lar cross section (h 5 75 mm, b 5 20 mm) carries a uniform load of q 5 48 kN/m that includes its own weight. The maximum transverse shear stress on the cross section at 0.25 m from the left support is approx-imately:
(A) 20 MPa
(B) 24 MPa
(C) 30 MPa
(D) 36 MPa
Stars with masses between 0.4-Mo and 4-Mo
a. undergo thermonuclear fusion of hydrogen and helium, but never get hot enough to ignite carbon. b. undergo thermonuclear fusion of hydrogen, but never get hot enough to ignite helium. c. produce type I supernovae after they exhaust their nuclear fuels. d. produce type II supernovae after they exhaust their nuclear fuels. e. undergo carbon detonation.
Series/Parallel Circuits: Four resistors are connected across an ideal dc battery with voltage V as shown in the figure. Assume that all quantities shown are accurate to two significant figures. If the total current through this circuit is I = 2.0 A, what is the current through the 4.0-? resistor?
A. 1.0 A B. 2.0 A C. 3.0 A D. 1.3 A E. 2.4 A
Suppose an object is suspended from strings as shown in the diagram below.
Which exerts the largest force on the connecting ring? A. String A B. String B C. String C