Aboat has a porthole window, of area 0.00849 m^2, 6.25 m below the surface. the density of sea water is 1027 kg/m^3. the air inside the boat is at 1 atm. what is the net force on the window?

1391.54 N

Explanation:

Area of window, A = 0.00849 m^2

Depth, h = 6.25 m

density of sea water, d = 1027 kg/m^3

Atmospheric pressure, Po = 1 atm = 1.01 x 10^5 Pa

Pressure at window,

P = Po + h d g

P = 1.01 x 10^5 + 6.25 x 1027 x 9.8 = 163903.75 Pa

Force on window = Pressure on window x Area of window

F = 163903.75 x 0.00849 = 1391.54 N

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )