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
(C) 0.85
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X-ray bursters are caused by black holes
a. True b. False Indicate whether the statement is true or false
One angstrom = 
m and one fermi = 
What is the relationship between these units?
A. 1 angstrom = 
fermi
B. 1 angstrom = 
fermi
C. 1 angstrom = 
fermi
D. 1 angstrom = 
fermi
A 6.00-kg block is in contact with a 4.00-kg block on a horizontal frictionless surface as shown in the figure. The 6.00-kg block is being pushed by a horizontal 20.0-N force as shown
What is the magnitude of the force that the 6.00-kg block exerts on the 4.00-kg block? A) 6.00 N B) 20.0 N C) 8.00 N D) 4.00 N E) 10.0 N
What would happen if the fusion rate in the core increased but the core could not expand?
A) The Sun's core would heat and the rate of fusion would increase further. B) The Sun's core would reach a new equilibrium, but at a cooler temperature. C) The Sun's core would reach a new equilibrium, but at a higher temperature. D) The Sun's core would cool and the rate of fusion would decrease.