oncrete will yield (crack and fail) at pressures around 70 Mega Pascals. That’s 70 million Pascals.      A 100 tonne load is to be driven over a concrete bridge. Each tyre on the truck has a contact area of around 0.00025 m2 with the bridge surface and transmits the weight force of the load through this contact.    What is the minimum number of tyres needed to ensure that the concrete does not fail?

A copper wire has a length of 4.5 m and a diameter of 3.6 mm. under what load will it's length increase by 0.30mm?

A sump pump (used to drain water from the basement of houses built below the water table) is draining a flooded basement at the rate of 0.700 L/s, with an output pressure of 2.00 x 105 N/m². You may neglect frictional losses in both parts of this problem. (a) The water enters a hose with a 3.00 cm inside diameter and rises 3.00 m above the pump. What is its pressure (in N/m²) at this point? N/m² (b) The hose goes over the foundation wall, losing 1.70 m in height, and widens to 4.00 cm diameter. What is the pressure now (in N/m²)? N/m²

In the figure, the fresh water behind a reservoir dam has depth D = 14.0 m. A horizontal pipe 3.51 cm in diameter passes through the dam at depth d= 5.62 m. A plug secures the pipe opening. (a) Find the magnitude of the frictional force between plug and pipe wall. (b) The plug is removed. What water volume exits the pipe in 2.00 h? (a) Number (b) Number Units Units