Answer:
<em>B</em><em>.</em><em> </em><em>Kinetic</em><em> </em><em>friction</em><em> </em>
Explanation:
This is definitely the correct answer because kinetic friction acts when an object is in motion and it allows the object to move without slipping, etc
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1. a) In order to sharpen the objective with a 40x objective (400x total magnification), the objective must be closer to the sample than with a 10x objective (100x total magnification), so the sample is out of focus.
b) At 400x total magnification, the field of view is narrower than at 100x total magnification.
c) A 40x objective (i.e. 400x total magnification) has a higher numerical aperture than a 10x objective (i.e. 100x total magnification) and therefore provides better resolution.
d) Shallow depth of field.
e) The amount of light is reduced.
f) Shorter working distance.
2. The best objective for observing bacteria is the 100x objective, which is the immersion objective.
3. Without the addition of immersion oil, the sample will look blurry and will not give maximum resolution.
Learn more about sharpen here;
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Thomson used a beam of negatively charged particles.
Answer:
a) T = 2.997 s
b) K = 14.3 J
c) φ = 0.444 rad
Explanation:
a) Determine its period
The pendulum simple’s period is:
T = 2π
Where l: Pendulum’s length
g = 9.8 m/s2
T = 2π
T = 2.997 s
b) Total energy
Initially his total energy is kinetic
K = 
K = 
K = 14.3 J
c) Maximum angular displacement
φ = 
φ =
φ = 0.444 rad
The answer is A because potential energy is stored up energy which means that it’s not moving