Aspherical balloon has a radius of 6.55 m and is filled with helium. the density of helium is 0.179 kg/m3, and the density of air is 1.29 kg/m3. the skin and structure of the balloon has a mass of 990 kg . neglect the buoyant force on the cargo volume itself. part a determine the largest mass of cargo the balloon can lift. express your answer to two significant figures and include the appropriate units.

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

Acylinder with a movable piston contains 11.7 moles of a monatomic ideal gas at a pressure of 1.32×10^5 pa. the gas is initially at a temperature of 300 k. an electric heater adds 43200 j of energy into the gas while the piston moves in such a way that the pressure remains constant. cp=20.79 j k^−1 mol^−1 for a monatomic ideal gas, and that the number of gas molecules is equal to avogadro's number (6.022×10^23) times the number of moles of the gas. (a) what is the temperature of the gas after the energy is added? (b) what is the change in volume of the gas? (c) how much work is done by the gas during this process?

Who was the first scientist to measure speed as distance over time?