Two simple pendulums of equal length l = 0.45 m are suspended from the same point. The pendulum bobs are small solid steel spheres. The first bob is drawn back to make a 35° angle with the vertical, while the other one is left hanging at rest
If the first bob has a mass of 0.25 kg and the second has a mass of how high will the second bob rise above its initial position when struck elastically by the first bob after it is released?
A) 2.7 cm B) 3.3 cm C) 4.4 cm D) 3.9 cm
B
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Nuclear Binding Energy: In massive stars, three helium nuclei fuse together, forming a carbon nucleus, and this reaction heats the core of the star. The net mass of the three helium nuclei must therefore be
A. higher than that of the carbon nucleus. B. less than that of the carbon nucleus. C. the same as that of the carbon nucleus because mass is always conserved. D. the same as that of the carbon nucleus because energy is always conserved.
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
A point charge (5.0 pC) is located at the center of a spherical surface (radius = 2.0 cm), and a charge of 3.0 pC is spread uniformly upon this surface. Determine the magnitude of the electric field 1.0 cm from the point charge
a. 0.72 kN/C b. 0.45 kN/C c. 0.63 kN/C d. 0.90 kN/C e. 0.18 kN/C
Label the following as body area (BA) or organ system (OS): neck
a. BA b. OS