1.Why HF (hydrogen fluoride) has higher boiling temperature than HCl (hydrogen chloride), even thought HF has lower molecular weight?
2.An aluminum rod if 20 mm diameter iselongated 3.5 mm along its longitudinal direction by a load of 25KN. If the modulus of elasticity of aluminum is E = 70 GPa,determine the original length of the bar.
3.A valueable preserved biological specimen is weighed by suspeding it from a spring scale. it weighs 0.45 N when it is suspendedin air and 0.081 N when it is suspended in a bottle of alchol what is its dencity?