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LenKa [72]
3 years ago
12

Which one thank youuu!​

Physics
1 answer:
gtnhenbr [62]3 years ago
4 0

Answer:

the answer is 10n to the left. option B

Explanation:

when two sides are parallel to each other you subtract

for example

f1+f2=R2

30n-20n=10n

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An inclined is a simple machine that will increase the distance something moves, but it will reduce the amount of energy needed.
emmainna [20.7K]

Answer:

potential energy which later on gets converted to kinetic energy of an object

4 0
4 years ago
The Bullet Train The Shinkansen, the Japanese "bullet" train, runs at high speed from Tokyo to Nagoya. Riding on the Shinkansen,
jeyben [28]

Answer:

68.6 m/s

Explanation:

v = Speed of sound in air = 343 m/s

u = Speed of train

f_1 = Actual frequency

From the Doppler effect we have the observed frequency as

When the train is approaching

f=f_1\frac{v+u}{v}

When the train is receeding

\frac{2f}{3}=f_1\frac{v-u}{v}

Dividing the above equations we have

\frac{f}{\frac{2f}{3}}=\frac{f_1\frac{v+u}{v}}{f_1\frac{v-u}{v}}\\\Rightarrow \frac{3}{2}=\frac{v+u}{v-u}\\\Rightarrow 3v-3u=2v+2u\\\Rightarrow v=5u\\\Rightarrow u=\frac{v}{5}\\\Rightarrow u=\frac{343}{5}\\\Rightarrow u=68.6\ m/s

The speed of the train is 68.6 m/s

5 0
3 years ago
What is the difference between a mineral, glass, and a rock?
IrinaVladis [17]

Answer:

A mineral is a solid formation that occurs in earth. A rock is a combination of more than just one mineral. And glass have more of a crystalline structure

Explanation:

3 0
2 years ago
Help me for 11 point pls
grigory [225]

Answer:

B

Explanation:

Hope this helps. :)

4 0
3 years ago
What is the force that causes electrons to move in an electrical circuit
Anna11 [10]

Answer:

This force is called electromotive force, or EMF. Sometimes it is convenient to think of EMF as electrical pressure. In other words, it is the force that makes electrons move in a certain direction within a conductor.

4 0
3 years ago
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