How do I find the Normal Force, Acceleration of Masses and Tension in the String knowing that m_1 = 1kg, m_2 = 7kg, and that the coefficient of kinetic friction (μ_k) between m_1 and the surface is 0.4?

Steam enters an adiabatic diffuser at 150 kpa and 1208c with a velocity of 550 m/s. determine the minimum velocity that the steam can have at the outlet when the outlet pressure is 300 kpa.

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton

According to the image below, which season is about to begin in the southern hemisphere? a. summer b. autumn c. winter d. spring