Refrigerant 134a flows at steady state through a horizontal tube having an inside diameter of 0.05 m. the refrigerant enters the tube with a quality of 0.3, temperature of 36°c, and velocity of 12 m/s. the refrigerant exits the tube at 9 bar as a saturated liquid. determine: (a) the mass flow rate of the refrigerant, in kg/s. (b) the velocity of the refrigerant at the exit, in m/s. (c) the rate of heat transfer, in kw, and its associated direction with respect to the refrigerant.

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.