A120 kg machine is mounted on a spring of stiffness 7.68x10 n/m with no viscous damping. during operation the machine develops a harmonic force at a frequency of 100 rad/s. is it better to use an accelerometer of natural frequency 600 rad/s or a seismometer of natural frequency 600 rad/s to measure the vibrations? explain.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

The force on a cutting tool are 2600n vertically downward and 2100 horizontal. determine the resultant force acting on the tool and the angle at which it acts.

Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?