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3 years ago

I NEED ASAP

Physics

2 answers:

Artyom0805 [142]3 years ago

8 0

Answer:

Soil porosity is important for many reasons. A primary reason is that soil pores contain the groundwater that many of us drink. Another important aspect of soil porosity concerns the oxygen found within these pore spaces. All plants need oxygen for respiration, so a well-aerated soil is important for growing crops.

Explanation:

I Hope This Helps :D

Wittaler [7]3 years ago

5 0

You might be interested in

(a) Assume an electron in the ground state of the hydrogen atom moves at an average speed of 5.00 × 106 m/s. If the speed is kno

Sonbull [250]

Answer:

The minimum uncertainty in its position is 1.1587 nm

Explanation:

Given;

average speed of electron, v = 5.00 × 10⁶ m/s

percentage of speed uncertainty = 1%

Δv = 0.01( 5.00 × 10⁶ m/s) = 5.00 × 10⁴ m/s

Applying Heisenberg's uncertainty principle, to determine the uncertainty in its position.

ΔxΔP ≥ h/4π

Δx(mΔv) ≥ h/4π

Δx = h/4πmΔv

where;

Δx is uncertainty in its position

h is Planck's constant

m is mass of electron

Δx ≥ $\frac{6.626 *10^{-34}}{4\pi *9.1*10^{-31}*5*10^4} = 1.1587*10^{-9} \ m$

Δx ≥ 1.1587 nm

Therefore, the minimum uncertainty in its position is 1.1587 nm

4 0

4 years ago

A 49 kg pole vaulter running at 10 m/s vaults over the bar. Her speed when she is above the bar is 0.7 m/s. The acceleration of

nika2105 [10]

Answer:

Height will be 5.127 m

Explanation:

We have given mass m = 49 kg

Speed over the bar v = 10 m /sec

Acceleration due to gravity $g=9.8m/sec^2$

Kinetic energy on the ground $=\frac{1}{2}mv^2=\frac{1}{2}\times 49\times 10^2=2450J$

Potential energy on the ground $=mgh=0$ (as height will be zero )

Speed above the bar = 0.7 m /sec

So kinetic energy above the bar $=\frac{1}{2}mv^2=\frac{1}{2}\times 49\times 0.7^2=12J$

Potential energy above the bar = mgh

From energy conservation

Total kinetic energy = total potential energy

So $2450+12=0+49\times 9.8\times h$

$h=5.127m$

7 0

3 years ago

A car has a momentum of 20,000 kg • m/s. What would the car’s momentum be if its velocity doubles?

AnnyKZ [126]

To answer this question, it helps enormously if you know
the formula for momentum:

Momentum = (mass) x (speed) .

Looking at the formula, you can see that momentum is directly
proportional to speed. So if speed doubles, so does momentum.

If the car's momentum is 20,000 kg-m/s now, then after its speed
doubles, its momentum has also doubled, to 40,000 kg-m/s.

6 0

3 years ago

Read 2 more answers

The difference between relational and reactive aggression is that relational aggression is ______, whereas reactive aggression i

givi [52]

Answer:

Social, physical behavior

Explanation:

The relational aggression is the aggression which caused or give to person by doing harm to his or her relationship or social image.

Reactive aggression is the aggression which is caused by threatening someone, or caused by provocation, or caused due to frustration.

Therefore, the basic differentiation in between both the aggression is that relational aggression is caused by by damaging social status whereas reactive aggression is caused through physical behavior.

8 0

3 years ago

What is the frequency of radiation whose wavelength is 2.40 x 10-5 cm?

S_A_V [24]

<span>To begin, the formula for finding frequency when wavelength is known is "f = c / w" when c is the constant velocity (3 * 10^8 m/s). To convert the wavelength into a common form (m/s), it will have to be multiplied by 10^-2. This leaves the equation as "f = 3.0 * 10^8 / (2.4 * 10^-5 * 10^-2), or 2.4 * 10^-7. This gives 1.25 * 10^15 m/s as the frequency.</span>

7 0

3 years ago