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.
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
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