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3 years ago

Is an object on the surface of Earth sitting still relative to outer space?

Physics

1 answer:

DIA [1.3K]3 years ago

4 0

Answer:

The object is not still as it observe from the outer space.

Explanation:

Our earth is not stationary.

It rotates about its own axis with the period of 24 hours and it revolves around the sun with the period of 1 year.

An object is said to be at rest if the position of the object with respect to time changes.

An object is said to be in motion when the position of the object changes with respect to time.

Both the terms rest and motion are relative to each other.

If an observer observe an object on the earth from the outer space, he observe that the object s not still it is also moving as the earth is moving.

So, the object is not still as it observe from the outer space.

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babymother [125]

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3 years ago

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A large man sits on a four-legged chair with his feet off the floor. The combined mass of the man and chair is 95.0 kg. If the c

Leto [7]

Answer:

Pressure, $P=29.6\times 10^5\ Pa$

Explanation:

It is given that,

Combined mass of the man and the chair, m = 95 kg

Radius of the leg of chair, r = 0.5 cm = 0.005 m

A large man sits on a four-legged chair with his feet off the floor. The force acting per unit area is called the pressure exerted.

$P=\dfrac{F}{A}$

$P=\dfrac{mg}{A}$

Area of 4 legs, A = 4 A

$P=\dfrac{mg}{4\pi r^2}$

$P=\dfrac{95\times 9.8}{4\pi (0.005)^2}$

$P=29.6\times 10^5\ Pa$

So, the pressure each leg exert on the floor is $29.6\times 10^5\ Pa$ . Hence, this is the required solution.

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3 years ago

29. Identify whether each of the following is a form of mechanical energy:

Ede4ka [16]

Explanation:

elastic potential energy, chemical potential energy, and gravitational potential energy are all forms of mechanical energy.

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3 years ago

A car reversing at -7.2 m/s has a displacement of -21.6 m. How long did this take?

weeeeeb [17]

Answer:

Time=distance/velocity

T=S/V

T=(-21.6)/(-7.2)

Time=3seconds

4 0

3 years ago

A 55 kg skier is at the top of a slope. The vertical distance between start and finish is 10m. (a) What is her Potential Energy?

Blababa [14]

Explanation:

Given that,

Mass of a skier, m = 55 kg

The vertical distance between start and finish is 10 m.

(a) The potential energy of a skier is given by :

$E=mgh\\\\E=55\times 9.8\times 10\\\\=5390\ J$

(b) When she reaches the bottom of the hill, the potential energy is converted to kinetic energy. So,

$5390=\dfrac{1}{2}mv^2\\\\v=\sqrt{\dfrac{2\times 5390}{55}} \\\\v=14\ m/s$

Hence, her potential energy is 5390 J and at the bottom of the hill she is moving with a speed of 14 m/s.

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3 years ago