In general, the friction forces between one object and another act
A) in the same direction.
B) in opposite directions.
C) at right angles to each other.
D) none of the above
Answer: B
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A horizontal 2.00-m long, 5.00-kg uniform beam that lies along the east-west direction is acted on by two forces. At the east end of the beam, a 200-N forces pushes downward. At the west end of the beam, a 200-N force pushed upward
What is the angular acceleration of the beam? A) 240 rad/s2 north B) 1.33 × 102 rad/s2 north C) zero D) 240 rad/s2 south E) 1.33 × 102 rad/s2 south
Equilibrium: The mobile shown in the figure is perfectly balanced, and the horizontal supports have insignificant masses. What must be the masses of the suspended objects m1, m2, and m3 to maintain balance?
What will be an ideal response?
A pipe (E 5 110 GPa) carries a load P1 5 120 kN at A and a uniformly distributed load P2 5 100 kN on the cap plate at B. Initial pipe diameters and thicknesses are dAB 5 38 mm, tAB 5 12 mm, dBC 5 70 mm, and tBC 5 10 mm. Under loads P1 and P2, wall thickness tBC increases by 0.0036 mm. Poisson’s ratio ? for the pipe material is approximately:
(A) 0.27
(B) 0.30
(C) 0.31
(D) 0.34
The white light from the Sun is a
A) compliment of the surrounding blue sky. B) composite of light of all the visible frequencies. C) mixture of selected frequencies of light.