1. A nurse applies a force of 45 N to a syringe with a fluid inside. The diameter of the syringe piston measures 1.15 cm. By how much is the pressure in the fluid increased due to the applied force?
2. Water from a spring is carried through a pipe of length 100 m down a hill inclined at 20 degrees to the horizontal. When the pipe is full but water is not flowing, what is the pressure at the lower end of the pipe?
3. Three children each having a mass of 37.4 kg make a log raft by lashing together logs of diameter 32 cm and length 1.77 m. How many logs will be needed to keep them afloat?
Take the density of the wood to be 0.75 10^3 kg/m