A point mass mm is moving with constant speed v=3 m/s, driven by a force with the constant magnitude F=6 N. It is observed that the radius of curvature of the trajectory is rho=79.

What is the mass m?

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.