)the pressure in a gas container full of helium at 15°c is 200 barg. the container is a right cylinder with hemispherical ends such that the overall internal length is 1.8 m. the internal diameter of the container is 0.3 m. a) what mass of gas is in the container? b) what is the cost of helium (e per m@ 273.15 k and 1.0 atm.) if the price of the container is £150? answers a) 4.01 kg b) £6.68 m3 4) air may be assumed to be 21.0% v/v oxygen, 0.3%v/v carbon dioxide and 78.71 v/v nitrogen. evaluate the relative molar mass of air answers 28.898 kg kmol

A2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. take right to be the positive direction. what is the total momentum of the two balls before they collide? what is the total momentum of the two balls after they collide?

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

People with normal vision cannot focus their eyes underwater if they aren't wearing a face mask or goggles and there is water in contact with their eyes. in a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina.with the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 2.05cm in front of the eye.)