A 1.8-kg block is released from rest at the top of a rough 30° inclined plane. As the block slides down the incline, its acceleration is 3.0 m/s2 down the incline. Determine the magnitude of the force of friction acting on the block
a. 4.2 N
b. 3.0 N
c. 3.4 N
d. 3.8 N
e. 2.3 N
c
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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
The pressure at the bottom of a jug filled with water does NOT depend on
A) the acceleration due to gravity. B) water density. C) the height of the liquid. D) surface area of the water. E) none of the above
The compositions of dark clouds can be determined through absorption spectra
Indicate whether the statement is true or false
Density waves may explain:
A) the lack of blue stars in the halo. B) the random orbits of halo stars. C) the density of red stars in the bulge. D) the spiral arm structure of the Galaxy. E) the large number of open clusters in the halo.