A31.3cm diameter cylinder of nitrogen gas is 70cm long and at 534.48°c. the pressure gauge (as shown) reads 69.9 psi a) how many nitrogen atoms are in the cylinder? b) what is the mass of the nitrogen? c) what is the nitrogen molecule (n2) number density per unit volume? d) what is the gas's mass density?

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.