Answer:
627200LJ
Step-by-step explanation:
Height of box=5 m
Side of square base=4 m
Volume of rectangular box=
Using the formula
Volume of rectangular box=
Density of material=
We know that

Using the formula
Mass of rectangular box=
Gravity=
Weight of rectangular box,F=
Let L be the vertical distance traveled by box
Total work done =
Therefore,total work done against gravity =
=627200 L J
Hence, the box requires work against gravity=627200LJ
She had 60 pairs of shoes before selling any
Answer:
(6,0)
Step-by-step explanation:
The given system has equations:


Multiply the top equation by 2 to get:


Subtract the top equation form the bottom equation to get:



Put y=0 into 


Therefore the solution is (6,0)
Let x = total distance he covered
3x/4 by bus
1/2 . x/4 = x/8 by jogging
the remaining distance = x/8 by walking
thus x/8 = 800ft
x = 8 . 800 = 6400ft
Answer 28 because you plug it in for your answer.