Answer:
TRUE
Explanation:
the correct answer is TRUE
Compound microscope is one of the useful instrument which is used to view the objects at microscopic level.
We observe the objects at microscopic level because we want to study the nature of that object , gather information or many more objectives.
In compound microscope light source is beneath the specimen. it help to view the thin specimens very clearly.
hence, the statement is true.
10¹¹ is the approximate number of atoms in a bacterium.
<h3>
What do you understand by mass of element?</h3>
The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu).
Given,
Mass of a bacterium atom = 10⁻¹⁵ kg.
Mass of a hydrogen atom = 10⁻²⁷ kg.
From the above observation ,
The average mass of an atom of the bacterium is ten times the mass of a hydrogen atom.
Atomic mass 1 bacterium atom = 10 x mass of hydrogen atom
= 10 x 10⁻²⁷ kg.
= 10⁻²⁶ kg.
Thus,
The number of atoms in a bacterium
=
=
=
The approximate number of atoms in a bacterium is .
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Answer:
3160.41J
Explanation:
From the work energy theorem, the net work done is given by;
W = Kef - Keo
Where kef is final kinetic energy and keo is initial kinetic energy.
Now, from the question,
m = 62.8 kg
Initial speed(vo) = 5.2 m/s
Final speed (vf) = 11.3 m/s
We know that formula for kinetic energy is K = (1/2)mv²
Thus, Kef = (1/2)mvf² and Keo = (1/2)mvo²
Thus;
W = (1/2)mvf² - (1/2)mvo²
W = (m/2)(vf² - vo²)
W = (62.8/2)(11.3²-5.2²)
= 31.4(100.65) = 3160.41J
Answer:
0.9999999999999999999999999
Explanation:
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The maximum velocity reached by the person is determined as 11.1 m/s.
<h3>Area under velocity - time graph</h3>
The area under the velocity time graph is the total displacement of the person.
Total Area = area of triangle formed during first 2 seconds + area of rectangle during the last 8 seconds
100 = ¹/₂(2v) + v(11 - 2)
where;
- v is the maximum velocity
100 = v + 8v
100 = 9v
v = 100/9
v = 11. 1 m/s
Thus, the maximum velocity reached by the person is determined as 11.1 m/s.
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