<span>The answer is a. cutting trees reduce fertility and eliminates animal habitats. Plant material is essential in maintaing soil fertility. Leaves and branches decay to form humus; removing trees decreases the organic content. Trees are home to many animal species, including birds, insects and amphibians. Some trees are even support or home to other plants. Examples include epiphytes in the rainforest ecosystem. Clear cutting forests disrupts whole communities and ecosystems. </span>
D) Less than 20.
Explanation:
Equivalent resistance in a parallel combination is less than their individual value.
This question involves the concepts of centripetal force and centripetal acceleration.
a) The centripetal acceleration for the piece of gum stuck to the outside edge of the record will be "6.67 m/s²".
b) The gum will have to overcome "0.033 N" centripetal force to remain stuck to the vinyl.
a)
The centripetal acceleration of the gum can be found using the following formula:
where,
= centripetal acceleration = ?
v = linear speed of record = 1 m/s
r = radius of the record =
Therefore,
b)
Now, the centripetal force can be given as follows:
Learn more about centripetal force here:
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The attached picture shows the centripetal force.
Answer:
The average velocity of an object is defined as the total displacement covered by the particle divided by the total time taken in covering that displacement.
Let the position of the particle at any time <em>t</em> be .
Position of the particle at time = .
Position of the particle at time = .
Total displacement covered by the particle in time from to =
Therefore, the average velocity is given by
Now, the instantaneous velocity is defined as
The average value of instantaneous velocity in the same time interval is given by
Thus, from<em> </em>(1) and (2), it is clear that the average velocity of a particle calculated for the time interval from t1 to t2 really is the average value of the particle’s instantaneous velocity over the same time interval.