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4 years ago

Why does soil take so long to form?

1 answer:

4 0

The time needed to form a soil depends on the latitude: in environments characterized by a mild climate, it takes 200-400 years to form 1 cm of soil. in wet tropical areas soil formation is faster, as it takes200 years. in order to accumulate enough substances to make a soil fertile it takes 3000 years.

Hope it helps! :-)

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A billiard ball is moving in the x-direction at 30.0 cm/s and strikes another billiard ball moving in the y-direction at 40.0 cm

ipn [44]

To solve this problem it is necessary to apply the trigonometric ratios of the given velocity components.

If we make a graph of the velocity vectors in their respective velocities according to the given description we will have something similar to the attached graph.

The angle could be obtained from the components of the opposite leg and the adjacent leg so that

$tan\theta = \frac{x}{y}$

$\theta = tan^{-1}(\frac{x}{y})$

The opposite leg value (y) is 40cm / s and the adjacent leg (x) is 30cm / s

$\theta = tan^{-1}(\frac{30}{40})$

$\theta = 36.87\°$

Therefore the final direction that does the first ball is 36.87°

6 0

3 years ago

Matter and energy can convert into each other. True False

Valentin [98]

the answer is True you can convert matter and energy

8 0

3 years ago

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A stream of doubly ionized particles (2 protons) moves at a velocity of 3.0 × 104 m/s perpendicularly to a magnetic field of 0.0

max2010maxim [7]

The force on a charged particle on a magnetic field is given by:

$F=Bqv\sin\theta$

where B is the magnitude of the field, q is the charge of the particle, v is its velocity and θ is the angle between the field and the velocity of the particle.

In this case we have that:

• The magnitude of the field is 0.09 T.

• The charge of the particle is 3.2 x 10 –19C .

• The velocity is  3.0 × 10 4 m/s

• The angle between the field and the velocity is 90°, since they are perpendicular.

Plugging these we have:

$\begin{gathered} F=(0.09)(3.2\times10^{-19})(3\times10^4)\sin90 \\ F=8.64\times10^{-16}\text{ N} \end{gathered}$

Therefore, the force on the charge is:

$F=8.64\times10^{-16}\text{N}$

3 0

2 years ago

Which of the following fields push on a stationary electron?(A) electric and gravitational fields but not magnetic fields. (B) g

ruslelena [56]

Answer:

(A) electric and gravitational fields but not magnetic fields.

Explanation:

Let's analyze the effect produced by each of the three fields on the stationary electron:

- Gravitational force: the gravitational force exerted on the electron by a gravitational field is

$F=mg$

where

m is the mass of the electron

g is the strength of the gravitational field

Since the mass of the electron m is non-zero, the electron experiences a gravitational force.

- Electric field: the electric force exerted on the electron by an electric field is

$F=qE$

where

q is the charge of the electron

E is the magnitude of the electric field

Since the charge q of the electron is non-zero, the electron experiences an electric force.

- Magnetic field: the magnetic force exerted on the electron by a magnetic field is

$F=qvBsin \theta$

where

q is the electron charge

v is the velocity of the electron

B is the magnitude of the magnetic field

$\theta$ is the angle between the direction of v and B

Since the electron is stationary, we notice that the velocity is zero: v=0, therefore the magnetic force is zero as well.

Therefore, the correct answer is

(A) electric and gravitational fields but not magnetic fields.

8 0

3 years ago

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What is the acceleration an object experiences on earth?w?

mariarad [96]

9.8 m/s^s and thats the earths gravitational force!
Hope it helps

3 0

3 years ago