The independent variable is the time (minutes). The temperature is the dependent variable.
Explanation:
Given parameters:
Mass of the weight = 15kg
Height of bar lift = 0.25m
Number of times lifted = 15times
Unknown:
Total height the bar was lifted = ?
Force needed for the lift = ?
Work done = ?
Solution:
To solve this problem we need to understand that;
Work done = Force x distance
Work done = mass x acceleration due gravity x height
Work done = weight x height
a. Total height:
Total height = 0.25 x 15 = 3.75m
b. Force needed ;
Force needed = Weight of bar = mass x gravity
= 15 x 9.8 = 147N
So;
Force used for the 15 times = 15 x 147 = 2205N
c. Work done ;
Work done = weight x height = 2205 x 3.75 = 8268.75J
Here is the answer. The public can further be educated about the use of PFDs and BUI by the use of pamphlets that can be distributed to them when they buy a boat. Also, a commercial or advertisement would be helpful related to PFDs and BUI. In addition, they should also use the owner's manual. Hope this answers your question.