A rectangular plate in plane stress is subjected to normal stresses ?x 5 35 MPa, ?y 5 26 MPa, and shear stress ?xy 5 14 MPa. The ratio of the magnitudes of the principal stresses (?1/?2) is approximately:
(A) 0.8
(B) 1.5
(C) 2.1
(D) 2.9
(D) 2.9
Physics & Space Science
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A heavy ball hangs by a string, with a second string attached to its bottom (Figure 1.7 in your text). A slow pull on the bottom string breaks the
A) top string. B) bottom string. C) top or bottom string equally likely. D) none of the above
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A laser with a power of 1.0 mW has a beam radius of 1.0 mm
What is the peak value of the electric field in that beam? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 490 V/m B) 22 V/m C) 65 V/m D) 840 V/m E) 120 V/m
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The electric field shown is produced by a single point charge at the center of the picture
 What force will a negative charge placed at location C feel? a. zero b. a force up and to the left c. a force up and to the right d. a force down and to the left e. a force down and to the right
Physics & Space Science
All the planets orbit the Sun in exactly the same plane as the Earth
Indicate whether the statement is true or false
Physics & Space Science