It would take 38 minutes to fall through a (hypothetical) hole from one end of the Earth to the other. Until recently, it was th
1 answer:
Answer:
The percentage change in the hypothetical time is 10.53%
Explanation:
Percentage change in a quantity is given by;
* 100%
In this case, the quantity in question is time.
Therefore, percentage change in time =
* 100%
<em>where;</em>
Final time = 42minutes
Initial time = 38minutes
Substituting these values into the equation above gives;
=> * 100%
=> * 100%
=> 10.53%
<em>Hope this helps!</em>
You might be interested in
The ducks' flight path as observed by someone standing on the ground is the sum of the wind velocity and the ducks' velocity relative to the wind:
ducks (relative to wind) + wind (relative to Earth) = ducks (relative to Earth)
or equivalently,
(see the attached graphic)
We have
- ducks (relative to wind) = 7.0 m/s in some direction <em>θ</em> relative to the positive horizontal direction, or
- wind (relative to Earth) = 5.0 m/s due East, or
- ducks (relative to earth) = some speed <em>v</em> due South, or
Then by setting components equal, we have
We only care about the direction for this question, which we get from the first equation:
or approximately 136º or 224º.
Only one of these directions must be correct. Choosing between them is a matter of picking the one that satisfies <em>both</em> equations. We want
which means <em>θ</em> must be between 180º and 360º (since angles in this range have negative sine).
So the ducks must fly (relative to the air) in a direction 224º relative to the positive horizontal direction, or about 44º South of West.
Answer:
C. A force must be acting on the object.
Explanation:
This is due to the action of its momentum direction.