15) If the tight and slack side tensions in a flat belt running at 1 km/minute are 1500 N and 1000 N, the power transmitted is

16) Which material has maximum thermal conductivity?

17) Two forces 40 N and 30 N act at right angles to each other on a particle. The resultant force is

18) Heat transfer occurs due to _____ difference

19) Density of mild steel is _____ kg/cubic meter