Rubber,Plastic,I think thats it but everyone that can float has a high buoyancy
<h2>
Answer:</h2>
3.0cm
<h2>
Explanation:</h2>
For lenses in an achromatic combination, the following condition holds, assuming the two lenses are of the same materials;
d = ---------(i)
Where;
d= distance between lenses
f₁ = focal length of the first lens
f₂ = focal length of the second lens
From the question;
f₁ = 4.5cm
f₂ = 1.5cm
Substitute these values into equation (i) as follows;
d =
d =
d = 3.0cm
Therefore, the distance between the two lenses is 3.0cm
A nice caption is:
Beach days and bonfire nights
Newton also understood that white light can be separated into its components because each ray of color is deviated by the glass of the prism by a different amount. He realized, for example, that red light is consistently less deviated than violet light.
The time taken for the train to stop is 8.9 seconds.
The distance traveled by the train during acceleration is 9,984 m.
The distance traveled by the train during deceleration is 17.8 m.
<h3>
Time taken for the train to stop</h3>
Use the following kinematic equation to determine the time taken for the train to stop.
v = u + at
where;
- v is the final velocity of the train = 0
- u is the initial velocity = 4 m/s
- a is the deceleration = -0.45 m/s²
- t is time of motion
0 = 4 - 0.45t
0.45t = 4
t = 4/0.45
t = 8.89 seconds = 8.9 seconds
<h3>Distance traveled by the train during acceleration</h3>
s = ut + ¹/₂at²
where;
- t is time of motion = 8 min = 480 seconds
s = (4)(480) + ¹/₂(0.07)(480)²
s = 9,984 m
<h3>Distance traveled by the train during deceleration</h3>
s = ut + ¹/₂at²
s = (4 x 8.9) + ¹/₂(-0.45)(8.9)²
s = (4 x 8.9) - ¹/₂(0.45)(8.9)²
s = 17.8 m
Learn more about deceleration here: brainly.com/question/75351
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