What are the advantages and drawbacks of using solar energy

upfront price, but dependent on how long you use it you will save money, also the power it provides per square inch is low but that will be solved with time.

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.