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3 years ago

What percentage of the earth's surface is covered in water

Physics

2 answers:

Alla [95]3 years ago

8 0

Answer:

71 % of the earth's surface is covered in water

Novosadov [1.4K]3 years ago

4 0

Answer:

71%

Explanation:

You might be interested in

When is the best time to take a resting heart break

Olegator [25]

Answer:

I believe D

Explanation:

You need to have a more accurate reading and you want to test it multiple times throughout the week though to get a base resting rate.

I hope this is correct good luck!

5 0

3 years ago

Which situation is contrary to Newton’s first law of motion?

Bond [772]

Answer:

An object at rest stays at rest as long as unbalanced forces act on it.

Explanation:

Inertia can be defined as the tendency of an object or a body to continue in its state of motion or remain at rest unless acted upon by an external force.

In physics, Sir Isaac Newton's First Law of Motion is known as Law of Inertia and it states that, an object or a physical body in motion will continue in its state of motion at continuous velocity (the same speed and direction) or, if at rest, will remain at rest unless acted upon by an external force.

The inertia of a physical object such as a truck is greatly dependent or influenced by its mass; the higher the quantity of matter in a truck, the greater will be its tendency to continuously remain at rest.

Hence, the situation which is contrary to Newton’s first law of motion is that, an object at rest stays at rest as long as unbalanced forces act on it.

According to Newton’s first law of motion, an object at rest stays at rest as long as unbalanced forces do not act on it.

4 0

3 years ago

How much heat in joules is needed to raise the temperature of 10 grams of water from 25 c to 50 c?

natali 33 [55]

Answer: 10.5 kJ

Explanation:

In order to be able to solve this problem, you will need to know the value of water's specific heat, which is listed as

c = 4.18 J g ∘ C

4 0

3 years ago

Verify that the linear speed of an ultracentrifuge is about 0.50 km's, and Earth in its orbit is about 30 km/s by calculating:

FrozenT [24]

Answer:

a) Indeed, the linear speed of the ultracentrifuge is 0.524 kilometers per second.

b) Indeed, the linear speed of the Earth in its orbits about the Sun is approximately 30 kilometers per second.

Explanation:

The linear speed of the particle ( $v$ ), measured in kilometers per second, rotating in a circular pattern is calculated by the following formula:

$v = R\cdot \omega$ (1)

Where:

$R$ - Radius, measured in kilometers.

$\omega$ - Angular speed, measured in radians per second.

Now we proceed to calculate the linear speed of each element:

a) Ultracentrifuge

If we know that $\omega \approx 5235.988\,\frac{rad}{s}$ and $R = 1\times 10^{-4}\,km$ , then the linear velocity is:

$v = (1\times 10^{-4}\,km)\cdot \left(5235.988\,\frac{rad}{s} \right)$

$v = 0.524\,\frac{km}{s}$

Indeed, the linear speed of the ultracentrifuge is 0.524 kilometers per second.

b) Earth

The Earth is 150 million kilometers away from the Sun and takes 365 days to complete one revolution around the Sun. First, we calculate angular speed of the planet:

$\omega = \frac{2\pi}{T}$ (2)

Where $T$ is the period, measured in seconds.

If we know that $T = 31536000\,s$ , then the angular speed of the Earth is:

$\omega = \frac{2\pi}{31536000\,s}$

$\omega = 1.992\times 10^{-7}\,\frac{rad}{s}$

Now, we determine the linear speed:

$v = (1.5\times 10^{8}\,km)\cdot \left(1.992\times 10^{-7}\,\frac{rad}{s} \right)$

$v = 29.88\,\frac{km}{s}$

Indeed, the linear speed of the Earth in its orbits about the Sun is approximately 30 kilometers per second.

6 0

3 years ago

You are in a tall building located near the equator. What happens to your tangential speed due to the earth's rotation as you ri

8_murik_8 [283]

Answer:increases

Explanation:

If we are going upward in an elevator from the ground floor to the top floor then it indicates that your distance from the center of the earth is increasing while the time period remains the same.

If the radial distance is increased then the tangential velocity of the object must be increased because the time period is the same.

This can be best explained by taking an example of a car moving in a circle of radius r. If radial is increased for the same period then the car has to travel at a higher velocity to make in time.

3 0

3 years ago