A composite beam is made up of a 90 mm 3 160 mm wood beam (Ew 5 11 GPa) and a steel bottom cover plate (90 mm 3 8 mm, Es 5 190 GPa). Allowable stresses in wood and steel are 6.5 MPa and 110 MPa, respectively. The allowable bending moment about the z axis of the composite beam is most nearly:
(A) 2.9 kN?m
(B) 3.5 kN?m
(C) 4.3 kN?m
(D) 9.9 kN?m
(C) 4.3 kN?m
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Even though the Martian atmosphere is composed almost completely of the greenhouse gas carbon dioxide, its surface is much colder than the Earth because its
A) atmosphere is much thinner B) surface does not radiate any infrared radiation C) atmosphere contains equal amounts of gases which neutralize the greenhouse effect D) polar caps are much larger than on the Earth
The continuing rise of carbon dioxide concentration in our troposphere is leading to worldwide cooling as dry ice forms at the poles
Indicate whether the statement is true or false
A 4.00-kg block rests between the floor and a 3.00-kg block as shown in the figure. The 3.00-kg block is tied to a wall by a horizontal rope
If the coefficient of static friction is 0.800 between each pair of surfaces in contact, what horizontal force F must be applied to the 4.00-kg block to make it move? A) 16.2 N B) 54.9 N C) 21.1 N D) 23.5 N E) 78.4 N
Suppose we look at two distant galaxies: Galaxy 1 is twice as far away as Galaxy 2. In that case, ________
A) Galaxy 1 must be twice as big as Galaxy 2 B) we are seeing Galaxy 1 as it looked at an earlier time in the history of the universe than Galaxy 2 C) Galaxy 2 must be twice as old as Galaxy 1 D) we are seeing Galaxy 1 as it looked at a later time in the history of the universe than Galaxy 2