In general, which of the following is usually the weakest bond?
A) ionic bond B) van der Waals bond
C) covalent bond D) hydrogen bond
B
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A steel bracket ABC (EI 5 4.2 3 106 N # m2) with span length L 5 4.5 m and height H 5 2 m is subjected to load P 5 15 kN at C. The maximum horizontal displacement of joint C is approximately:
(A) 22 mm
(B) 31 mm
(C) 38 mm
(D) 40 mm
The mass in the figure slides on a frictionless surface. If m = 2 kg, k1 = 800 N/m and k2 = 500 N/m, the frequency of oscillation (in Hz) is approximately
?
?
A. 6. B. 2. C. 4. D. 8. E. 10.
What is the momentum of a proton when it is moving with a speed of 0.60c? (mproton = 1.67 × 10-27 kg)
A) 1.2 × 10-19 kg? m/s B) 1.5 × 10-19 kg ? m/s C) 3.0 × 10-19 kg ? m/s D) 3.8 × 10-19 kg ? m/s
A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is 4m above the ground. What is the mass of the box?
A) 8.9 kg B) 8.0 kg C) 5.3 kg D) 6.7 kg