Answer: The required answers are :
(a) 21, (b) 26, (c) 18 and (d) 37.
Step-by-step explanation: We are given to solve the following problems with parentheses solved first.
(a). The given problem is
We have
(b) The given problem is
We have
(c) The given problem is
We have
(d) The given problem is
We have
Thus, the required answers are :
(a) 21, (b) 26, (c) 18 and (d) 37.
Given:
The given volume formulas to calculate the volume of a rectangular
pyramid.
To find:
The correct volume formula.
Solution:
The volume of a rectangular pyramid is:
Where, B is the base area of the rectangular pyramid and h is the vertical height of the rectangular pyramid.
Therefore, the correct volume of a rectangular pyramid is .
Note: In the given problem, the options are not in correct form.
Answer:
3200 ft-lb
Step-by-step explanation:
To answer this question, we need to find the force applied by the rope on the bucket at time
At
After seconds, the weight of the bucket is
Since the acceleration of the bucket is the force on the bucket by the rope is equal to the weight of the bucket.
If the upward direction is positive, the displacement after seconds is
Since the well is 80 ft deep, the time to pull out the bucket is
We are now ready to calculate the work done by the rope on the bucket.
Since the displacement and the force are in the same direction, we can write
Use and