d 0 a ch o D Q of stretching a non-linear spring requires an amount of Work given by the equation U - 154² 10x², Where U is in Joules and (x) is is meters. How much force is required to hold this spring stretched out im from its equilibrium position ?​

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false