which of the following is not a barrier to physical activity it is fear of injury I think.
Density-Dependent:
1<span><span><span><span>. </span>competition.</span><span>
<span>2. </span>overcrowding.</span><span>
3<span>. </span>predators.</span></span><span>
(These are a few from a test I took, hopefully they help you a bit >.<)</span></span>
1) 211m/s
2)240<span>°
3)759,600m or 759.6 km</span>
Answer:
346.66 Hz
Explanation:
= Length of string which is unfingered = l
= Length of string which is vibrate when fingered = 
= Unfingered frequency = 260 Hz
= Fingered frequency
Frequency is inversely proportional to length

So,

The frequency of the fingered string is 346.66 Hz
I cant do all but I can do number 4
When force moves ur leg u start skatin and when that happenes ur using a lot of force to move