When the Sun and Moon are lined up and pull together the tides they raise are called:
A. low tides
B. prolate tides
C. spring tides
D. neap tides
spring tides
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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 maximum permissible value of Q is approximately:
(A) 10.5 kN
(B) 11.8 kN
(C) 13.2 kN
(D) 15.0 kN
A worker pulls a 350-N packing crate at constant velocity across a rough floor by exerting a force F = 200.0 N at an angle of 30.0° above the horizontal. What is the coefficient of kinetic friction of the floor?
a. 0.793 b. 0.693 c. 0.593 d. 1.386 e. 0.400
Most of Earth's freshwater supply is now in the
form of a) oceans. b) rivers and lakes. c) groundwater. d) glacial ice.
Which of the following is a vector quantity?
A) area B) volume C) mass D) none of the above