How do you calculate the surface area and pressure in hydraulics in slave and master pistons using this example? e. g. master piston pressure = 20n and the surface are is 10cm² and the slave piston's pressure is 60n.

Acylindrical specimen of a nickel alloy having an elastic modulus of 207 gpa (30 × 106psi) and an original diameter of 10.2 mm (0.40 in.) experiences only elastic deformation when a tensile load of 8900 n (2000 lbf) is applied. compute the maximum length of the specimen before deformation if the maximum allowable elongation is 0.25 mm (0.010 in.)

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m

Find an expression for the electric field e⃗ at the center of the semicircle. hint: a small piece of arc length δs spans a small angle δθ=δs /r, where r is the radius. express your answer in terms of the variables q, l, unit vectors i^, j^, and appropriate constants.