Answer:
The correct option is;
b. How high the barbell is being lifted
Explanation:
The work done in lifting the 160 N barbell is equal to the potential energy gained by the barbell in the final elevated position of the barbell
Therefore, in order to find the work done to lift the barbell, we can calculate the potential energy gained by the barbell when it is placed at height
The work done to lift the barbell = The potential energy, P.E., gained by the barbell
The potential energy of an object, P. E. = The mass of the object, m × The acceleration due to gravity, g × The height to which the barbell is lifted, h
∴ Mathematically, P.E. = m × g × h
Weight, W = Mass, m × The acceleration due to gravity, g
The weight, W of the barbell is given as W = 160 N
∴ W = m × g = 60 N
From which we have;
P.E. = m × g × h = W × h
∴ The work done to lift the barbell = P.E. = 60 N × h = 60 N × The height to which the barbell is lifted.
Therefore the information which need be known is the height to which the barbell.
C. Falling unstable air forms a cold airmass
<u>Answer :</u>
In Normal view of spreadsheet, select area need to be printed. Next, click on Print Area in File menu and then select Set Print Area.
<u>Explanation:</u>
In spreadsheet, a particular area can be selected for printing by the following steps :
Step1: Open the spreadsheet where you wanted to select the area.
Step 2: Select or highlight the cells which you want to print either using the mouse or keyboard. To select using mouse click and drag the mouse across the cells you need to select. To select using keyboard, hold down CTRL key and highlight.
Step 3: Go to the page layout tab.
Step 4: In page layout tab select Print Area icon.
Step 5: Now a pop up appears with two option namely set print area and clear print area.
Step 6: Select set print area. Now the selected range of cells can printed.
Work= force*distance
Work= x*12
Force= mass*acceleration
Force= 5 kg*6
Force= 40 N
Work= 40×12
Work= 480 J (joules)
I think this is it