Answer:
6.7x10 -7 C
Explanation:
The -7 is like a exponent on top, I think.
To solve the problem we will first start considering the Pressure given the hydrostatic definition of the product between the density, the gravity and the depth. We will define the area where the liquid acts and later we will use the definition of the force as a product between the pressure and the area to calculate the force given in the two depths. The gauge pressure at the depth x will be

This pressure acts on the strip of area

The force acting on that strip is given by,



To evaluate the force, we will then consider the integral of the pressure as a function of the Area, or the integral of the previously found terms.


Evaluating at the initial depth of 1.8m and the final depth of 4.4 we have then that,


Therefore the Net force will be



My teacher taught me that besides the type of wave, wavelength doesn't change unless you shorten the wave, and she used string as an example. Making the string shorter causes the wavelength to decrease so it can't be B. Your answer is A
Force applied by the lever to the object=2700 N
Explanation:
Mechanical advantage= 
mechanical advantage= 5.4
effort force= 500 N
we need the load force
5.4= load/500
load=2700 N
Thus the force applied by the lever to the object=2700 N