A block of weight (250 N) placed on rough surface as shown in fig, determine the friction force between the surface and the block( impending motion) 0.8 m P = 80 N 30 0.2 m
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- Panels AB and CD in Fig. are each 120 cm wide intothe paper. ( a ) Can you deduce, by inspection, which panelhas the larger water force? ( b ) Even if your deduction isbrilliant, calculate the panel forces anyway.The base of a dam for a lake is designed to resist up to 120 percent of the horizontal force of the water. After construction, it is found that silt (that is equivalent to a liquid of density ρs = 1.76 × 103 kg/m3 ) is settling on the lake bottom at the rate of 12 mm/year. Considering a 1-m-wide section of dam, determine the number of years of service until the dam becomes unsafe.The dam for a lake is designed to withstand the additional force caused by silt that has settled on the lake bottom. Assuming that silt is equivalent to a liquid of density ρs = 1.76 X 10 kg/m' and considering a l-m-wide section of dam. determine the percentage increase in the force acting on the dam face for a silt accumulation of depth 2 m.Fig. P5. 86
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