John weighs 200 pounds.
In order to lift himself up to a higher place, he has to exert force of 200 lbs.
The stairs to the balcony are 20-ft high.
In order to lift himself to the balcony, John has to do
(20 ft) x (200 pounds) = 4,000 foot-pounds of work.
If he does it in 6.2 seconds, his RATE of doing work is
(4,000 foot-pounds) / (6.2 seconds) = 645.2 foot-pounds per second.
The rate of doing work is called "power".
(If we were working in the metric system (with SI units),
the force would be in "newtons", the distance would be in "meters",
1 newton-meter of work would be 1 "joule" of work, and
1 joule of work per second would be 1 "watt".
Too bad we're not working with metric units.)
So back to our problem.
John has to do 4,000 foot-pounds of work to lift himself up to the balcony,
and he's able to do it at the rate of 645.2 foot-pounds per second.
Well, 550 foot-pounds per second is called 1 "horsepower".
So as John runs up the steps to the balcony, he's doing the work
at the rate of
(645.2 foot-pounds/second) / (550 ft-lbs/sec per HP)
= 1.173 Horsepower. GO JOHN !
(I'll betcha he needs a shower after he does THAT 3 times.)
_______________________________________________
Oh my gosh ! Look at #26 ! There are the metric units I was talking about.
Do you need #26 ?
I'll give you the answers, but I won't go through the explanation,
because I'm doing all this for only 5 points.
a). 5
b). 750 Joules
c). 800 Joules
d). 93.75%
You're welcome.
And #27 is 0.667 m/s .
Answer:
D. Fingerprints
Explanation:
answers for Plato. I took the test
Red Skull's relative velocity to Captain America, towards the left front of the
truck is approximately <u>33.23 m/s</u> in a direction from the North of
approximately <u>9.18°</u>.
Reasons:
Assumptions;
Taking the north direction as positive.
The activity takes place on the trucks.
The trucks are moving towards each other.
Solution:
Vector form of net speed of Red Skull, is given as follows;
- v₁ = -(
× 3.5)·i + ( × 3.5 + 12.5)·j
Vector form of the net speed of Captain America is given as follows;
- v₂ = ( × 4.0)·i - ( × 4.0 + 15)·j
Relative velocity, v₁₂ = v₁ - v₂
∴ v₁₂ = (-( × 3.5) - ( × 4.0))·i + (( × 3.5 + 12.5) + ( × 4.0 + 15))·j
- v₁₂ =
·i + 
·j
Red Skull's velocity relative to Captain America, v₁₂ = ·i + ·j
Therefore;
- Red Skull appears to be moving West at <u>5.3 m/s</u> and North at <u>32.8 m/s</u>
- The direction is
Therefore;
- Red Skull appear to be moving at 90° - 80.2° ≈ 9.18° towards the left front end of the truck moving North
The magnitude of the velocity, |v₁₂|, is given as follows;
·
The magnitude of Red Skull's velocity relative to Captain America is,
therefore;
|v₁₂| ≈ <u>33.23 m/s</u>
Learn more here:
brainly.com/question/24430414
a. speed b. direction c. Magnitude d. Direction
