Lillian pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration?
A) 0.3 m/s2
B) 3.0 m/s2
C) 10 m/s2
D) 30 m/s2
E) 300 m/s2
Answer: B
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Pure iron at room temperature has the BCC structure; however, iron can also be found in the FCC structure at higher temperatures. Predict the lattice parameter of FCC iron if it did form at room temperature, assuming that atoms touch only along the most closely packed directions in both the FCC and BCC structures. The lattice parameter of BCC iron at room temperature is 0.286 nm.
What will be an ideal response?
Beam ACB has a sliding support at A and is supported at C by a pinned-end steel column with square cross section (E 5 200 GPa, b 5 40 mm) and height L 5 3.75 m. The column must resist a load Q at B with a factor of safety of 2.0 with respect to the critical load. The max-imum permissible value of Q is approximately:
(A) 10.5 kN
(B) 11.8 kN
(C) 13.2 kN
(D) 15.0 kN
A spar buoy is a cylindrical object that floats with its axis in the vertical direction
When it is disturbed a distance h from its equilibrium position, the magnitude of the restoring force is equal to ?ghS, where ? is the density of the water and S is the cross-sectional area of the cylinder. A certain spar buoy has a mass of 150 kg, a cross-sectional area of 2.50 m2, and is floating in seawater, ? = 1025 kg/m3. What is the frequency of ocean waves which will cause it to resonate? A) 12.9 Hz B) 2.06 Hz C) 7.19 Hz D) 17.1 Hz E) 2.72 Hz
In size and mass, irregular galaxies tend to be ________ than spirals
Fill in the blank(s) with correct word