3 years ago

Two objects must be in contact for them to exert a force on each other. True or False

Physics

1 answer:

nevsk [136]3 years ago

7 0

Answer:

False

Explanation:

This proposition is false because by example the sun exerts a force over the earth and them are not in contact

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Imagine you are waiting for a train to pass at a railroad crossing. Will the train whistle have a higher pitch as the train appr

frosja888 [35]

THE DOPPLER EFFECT. Anyways, it would have a higher whistle as it approaches you, when it gets to you it only gets quieter because it leaves after. Think of a motorcycle going by, its loud coming to you then as it passes it gets quieter.

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2 years ago

2 resistors of resistance 1000 ohm and 2000 ohm are joined in series with a 100V supply. A voltmeter of internal resistance 4000

Vadim26 [7]

<h2>The voltmeter reading will be 35.7 volt </h2>

Explanation:

The resistor 1000 ohm and 4000 ohm are connected in parallel .

Their combined resistance is supposed R₁

Thus $\frac{1}{R_1}$ = $\frac{1}{1000}$ + $\frac{1}{4000}$

or R₁ = 800 ohm

Therefore the total resistance in circuit is = 2000 + 800 = 2800 ohm

Because these are in series .

We can find current flowing through the circuit I = $\frac{V}{R}$ = $\frac{100}{2800}$ = $\frac{1}{28}$

here R is total resistance .

The potential difference across 1000 ohm = $\frac{1}{28}$ x 1000 = 35.7 volt

Thus voltmeter reading will be 35.7 volt

5 0

3 years ago

What’s the equation for this

aleksley [76]

Where is the question

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3 years ago

A bird flies north 3 kilometers and then south 4 kilometers, what is the resultant displacement of the bird? Do not forget to in

Ber [7]

Answer: let north be+ and south be-

therefore, -1 km is the resultant displacement of the bird

hope it helped u,

pls put thanks and pls mark as the brainliest

^_^

8 0

2 years ago

an eagle has a mass of 8 kg and is flying 85 m above he ground with a speed of 20 m/s. what is the total mechanical energy of th

antoniya [11.8K]

85+5=90 :DD
90-20=70 :DDD

Good lessons.

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3 years ago