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3 years ago

What is gravity ?short ans

Physics

1 answer:

Nezavi [6.7K]3 years ago

7 0

Answer:

Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.

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If 20 N force does 400 J<br> of work to move an<br> object, how far does the<br> object move?

Neporo4naja [7]

Answer:

Explanation:

W = F*d

400 = 20*d

d = 20

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3 years ago

The relative highness or lowness of a sound is called ______. Multiple Choice pitch timbre dynamics octave

Assoli18 [71]

Pitch is the answer…….

8 0

2 years ago

A boy whirls a ball on a string in a horizontal circle of radius 1 m. How many revolutions per minute must the ball make if its

spayn [35]

Answer:

Nearest, the revolutions per minute will be 29.

Explanation:

Given that,

Radius of circle = 1 m

Acceleration a =g

We know that,

Angular frequency is defined as,

$\omega=2\pi n$

Where, n = number of revolutions in one second

We need to calculate the revolutions in one second

Using formula of centripetal acceleration

$a=\omega^2r$

Put the value of a and ω

$g=(2\pi n)^2r$

$n=\sqrt{\dfrac{g}{r}}\times\dfrac{1}{2\pi}$

Put the value into the formula

$n=\sqrt{\dfrac{9.8}{1}}\times\dfrac{1}{2\pi}$

$n=0.49$

We need to calculate the revolutions per minute

Using value for the revolutions per minute

$n=0.49\times60$

$n=29.4$

Hence, Nearest, the revolutions per minute will be 29.

7 0

3 years ago

A car has momentum, p=10880 kg m/s, east. If the car is traveling east at 16 m/s, its mass must be [m] kg.

MaRussiya [10]

Answer:

<h3>The answer is 67.5 kg</h3>

Explanation:

To find the mass of an object given it's momentum and velocity we use the formula

$m = \frac{p}{v} \\$

where

p is the momentum

v is the velocity

From the question

p = 1080 kgm/s

v = 16 m/s

We have

$m = \frac{1080}{16} = \frac{135}{2} \\$

We have the final answer as

Hope this helps you

5 0

4 years ago

Read 2 more answers

Do tides depend more on the strength of gravitational pull or on the difference in strengths? explain.

SSSSS [86.1K]

Tides are influenced by the force of gravity exerted by the earth, moon and the sun. The sun has a larger mass than the moon and as such has a greater gravitational pull on the earth. the moon however has greater influence over the tides because they are caused by the difference in gravity fields. This means that the moon is the dominant influence due to the fact that the fractional difference in its force across the earth is greater than that seen from the sun.

8 0

3 years ago

What is gravity ?short ans​

What is gravity ?short ans