Elena held a rock weighing 1 N in her hand. The rock has no velocity. KE________?
1 answer:
KE = 0
<h3>Further explanation </h3>Energy is the ability to do work
Energy because its motion is expressed as Kinetic energy (KE) which can be formulated as:
So for two objects that have the same speed, the greater the mass of the object, the greater the kinetic energy
The stone in hand is in a motionless state (at rest) so that its velocity (v) = 0, so it has no kinetic energy
But this stone can have <em>potential energy that is gained due to its height</em>
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Taking into account the definition of percentage composition, the percent composition of potassium iodide in this sample is 0.017%.
<h3>Definition of percent composition </h3>The Percentage Composition is a measure of the amount of mass that an element occupies in a compound and indicates the percentage by mass of each element that is part of a compound.
To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.
<h3>Percentage Composition in this case</h3>In this case, you know that a 0.51 kg (or 510000 mg, being 1 kg= 1000000 mg) solution contains 87 mg of potassium iodide.
Dividing the mass amount of potassium iodide present in the compound by the mass of the sample and multiplying it by 100 to obtain a percentage value, the percentage composition of potassium iodide is obtained:
<u><em>percentage composition of potassium iodide= 0.017%</em></u>
Finally, the percent composition of potassium iodide in this sample is 0.017%.
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