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Butoxors [25]
3 years ago
10

A starship passes Earth at 80% of the speed of light and sends a drone ship forward at half the speed of light rela- tive to its

elf. Show that the drone travels at 93% of the speed of light relative to Earth.
Physics
1 answer:
alisha [4.7K]3 years ago
8 0

Answer:

Check Explanation

Explanation:

Let the speed of the drone relative to earth be u = ?

Let the speed of the drone relative to the starship be u' = 0.5c

Let the speed of the starship relative to earth be v = 0.8c

In the theory of relativity,

The 3 speeds are related thus

u = (u' + v)/[1 + (u'v/c²)]

u = (0.5c + 0.8c)[1 + ((0.8c × 0.5c)/c²)]

u = 1.3c/[1 + (0.4c²/c²)]

u = 1.3c/1.4 = 0.9286 c = 0.93 c = 93% c

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When two point charges are a distance d part, the electric force that each one feels from the other has magnitude F. In order to
Serjik [45]

Answer:

E) d/sqrt2

Explanation:

The initial electric force between the two charge is given by:

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where

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We can also rewrite it as

d=\sqrt{k\frac{q_1 q_2}{F}}

So if we want to make the force F twice as strong,

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the new distance between the charges would be

d'=\sqrt{k\frac{q_1 q_2}{(2F)}}=\frac{1}{\sqrt{2}}\sqrt{k\frac{q_1 q_2}{(2F)}}=\frac{d}{\sqrt{2}}

so the correct option is E.

8 0
2 years ago
How many significant figures are in 246.32
muminat

Answer:5

Explanation:

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8 0
3 years ago
Calculate the pressure in SI unit when a force of 100 dyne acts on area of 0.02cm²​
Andru [333]

Answer:

500 Pa

Explanation:

Convert given units to SI:

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P = 0.001 N / (2×10⁻⁶ m²)

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