Aspherical balloon is made from a material whose mass is 3.00 kg. the thickness of the material is negligible compared to the 1.50 m radius of the balloon. the balloon is filled with helium at a temperature of 305 k and just floats in air, neither rising nor falling. the density of the surrounding air is 1.19 kg/m3. find the pressure of the helium gas assuming it is ideal.

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Ionic compounds can be readily dissolved in water because the high dielectric constant of water screens and decreases the force between the oppositely charged ions.