Question
1 answer:
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Answer:
216.31 (the work done by gravity is -216.31) positive for going up.
Explanation:
We look at this question first by getting the right equation for <em>work</em>.
Which should be... W = F x D.
From this, we can do everything, we need the Force (F) first - the question tells us that Joe is lying on his back and moves his arms upward to raise the barbell. This means that he is countering the force of graving on the object.
What is the formula for the force of gravity on an object near the earth?
Right here --- = mg
m = the mass and...
g = the acceleration due to gravity which is <em>9.81 m/s2</em>
Before we plug things in though, we need to convert everything to SI units,
the weight is in kg - so we're good to go there, but the length of Joe's arms are in "cm" we need m or meters. Converting 70 cm to m = .7 m.
Now, we just put it all together - (31.5kg)(9.81m/s2)(.7m) = 216.31 J or 216.31 N m.
The distance that the rubber ducks traveled = 1600 miles.
The time taken to travel this distance = 10 months.
By definition, the approximate average speed of the ocean is
v = (1600 miles)/(10 months)
Note that
1 mile = 1609 m
10 months = (10 months)*(30 days/month) *(24 hours/day)
= 7200 hours (approx.)
= 7200*3600 = 2.592 x 10⁷ s
Therefore
Also,
Answer:
The average velocity is approximately 0.1 m/s, or 0.222 m/h.
The time taken to travel this distance = 10 months.
By definition, the approximate average speed of the ocean is
v = (1600 miles)/(10 months)
Note that
1 mile = 1609 m
10 months = (10 months)*(30 days/month) *(24 hours/day)
= 7200 hours (approx.)
= 7200*3600 = 2.592 x 10⁷ s
Therefore
Also,
Answer:
The average velocity is approximately 0.1 m/s, or 0.222 m/h.