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2 years ago

The wavelengths for visible light rays correspond to which of these options?

Physics

1 answer:

ryzh [129]2 years ago

5 0

Answer:

sorry about the other person but its b

Explanation:

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A rocket accelerates upward from rest at a rate of 5 m/s^2. At a height of 1000m, the engines burn out and it coasts the rest of

laila [671]

Answer:

Explanation:

Given

acceleration of rocket(a) $=5 m/s^2$

At h=1000 m rocket burn out

$v^2-u^2=2as$

$v^2-0=2\times 5\times 1000$

$v=\sqrt{10^4}=100 m/s$

(b) time to reach v=100 m/s

v=u+at

$100=0+5\times t$

$t=\frac{100}{5}=20 s$

(c)Rocket maximum altitude

$v^2-u^2=2as$

here u=100 m/s

v=0

$a=9.8 m/s^2$

$s=\frac{v^2}{2g}$

$s=\frac{100^2}{2\times 9.8}$

[tex]s=510.204

Therefore maximum altitude=510.204+1000=1510.204 m

7 0

2 years ago

Columnar joints form when ________.

vagabundo [1.1K]

Answer:

b. during the final stages of cooling, a lava flow contracts, forming tall polygonal fractures

Explanation:

The columnar joints are very interesting and attractive for the eye geological features. They are not very common feature which makes them even more interesting. Some of them have been covered by sediments so they are hidden below the surface, but some have remained above the surface, sticking out as the erosion acts much slower on them than the surrounding area. They form when the lava cools off very quickly at its final stages, thus starting to contract, and instead of being smooth, they become polygonal fractures that are very tall.

5 0

2 years ago

14) A race car accelerates from rest to a velocity of 41 m/s in 480 m. What is the acceleration of the race car?

natka813 [3]

Answer:

Explanation:

V₀ = 0 m/s

V = 41 m/s

S = 480 m

___________

a - ?

Distance traveled: