HELP PLZ AND THANK U A system with one fixed and one movable pulley operates with 90% efficiency. The movable pulley has a weight of 5 N. Using this pulley system, what is the minimum input force needed to lift a piano weighing 1,595 N?

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

The pressure increases by 1.0 x 104 n/m^2 for every meter of depth beneath the surface of the ocean. at what depth does the volume of a pyrex (bulk modulus 2.6 x 1010n/m^2) glass cube, 9.8 x 10^−2m on an edge at the ocean's surface, decrease by 7.5 x 10−10m^3? explain the formula beyond this point: p=1.0x10^4, b=2.6x10^10, l=9.8x10^−2, delta v=7.5x10^−10. at some point l needs to be cubed. why p is divided by delta v?

A100 kg running back runs at 5m/s into a stationary linebacker. it takes 0.5 for the running back to be completely stopped