Determine the partial pressures of a spacecraft atmosphere at 10 psi total pressure which is:
a)78% nitrogen
b) 21% oxygen
assume the partial pressure of exhausted carbon dioxide is just at the maximum allowable level according to nasa, 1995b.
the rest of the atmosphere is made up of trace gases

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

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

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?