A 10 kg block rests on top of a frictionless plane having an inclination of θ=33⁰, as shown in Figure 1. If the system is to remain in equilibrium, what should be the reading on the spring scale (spring scale is calibrated in Newtons)? Assume that the mass of the string is negligible. Could some one help me answer this question.

Asubmarine has a "crush depth" (that is, the depth at which water pressure will crush the submarine) of 250 m. what is the approximate pressure (water plus atmospheric) at this depth? (recall that the density of seawater is 1025 kg/m3, g = 9.81 m/s2, and 1 kg/(ms2) = 1 pa = 9.8692 10-6 atm.) a. 34.8 atm b. 24.8 atm c. 25.8 atm d. 7.8 atm

The ability to make things happen is also called a. heat b. force c. matter d. energy

Estimate the magnitude of the electric field due to the proton in a hydrogen atom at a distance of 5.29×10 to the power of −11 m, the expected position of the electron in the atom.