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3 years ago

Which action could help a homeowner maintain soil quality of the quality

1 answer:

6 0

Increased soul protection by crop residues and plants adding organic matter to the soil through crop rotations manures or crop residues and carful management of fertilizers

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How many electrons pass through a 20-ohms resistor in 10 min if there is a potential drop of 30 volts across it?

tangare [24]

The number of electrons passes through 20 ohms resistor in 10 minutes is 5.625e+21.

<h3>What is a resistor?</h3>

In an electronic circuit, a resistor is an electrical component that limits or regulates the flow of electrical current.

Given, the resistance is 20 ohms.

The potential difference is 30 volts

Time is 10 minute

By the formula of current

$\rm I = \dfrac{30}{20} = 1.5 \;C/s$

The charge flowing through the resistor is 1.5 C/s

1 electron charge is 1.6e+19

Now, the number of electrons passing through a 20 ohms resistor is

$\dfrac{1.5}{1.6e+ ^2^1} = 0.9375e+^1^9$

In 10 minutes

$0.9375e+^1^9 \times 60 \times 10 = 5.625e+^2^1$

Thus, the number of electrons passes through 20 ohms resistor in 10 minutes is 5.625e+21.

Learn more about a resistor

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5 0

2 years ago

By applying the strategy of containment, the united states hoped to prevent the

dolphi86 [110]

By applying the containment strategy, the United States' objective was to prevent the expansion of the Soviet Union's influence in the world.

<h3 /><h3>What is the containment strategy?</h3>

It can be understood as a foreign policy strategy to prevent the spread of the communist system, being the policy that guided the Cold war, which took place between the USA and the USSR after the end of the second world war.

Therefore, the containment strategy is a foreign policy that aimed to influence the allies to prevent the strengthening of communism.

Find out more about Cold War here:

brainly.com/question/25774915

8 0

2 years ago

Frank, who lives in texas, and his sister lilly, who lives in japan, correspond regularly. From what he can tell from the postma

ehidna [41]

Answer:

(A) There is convincing evidence that there is no difference in the mean delivery times.

(B) There is convincing evidence that there is a difference in the mean delivery times.

(C) There is convincing evidence that the mean delivery time from Japan to Texas is greater than the mean delivery time from Texas to Japan.

(D) There is not convincing evidence that the mean delivery time from Japan to Texas is greater than the mean delivery time from Texas to Japan.

(E) The t-test cannot be used for sample sizes that are this small.

Explanation:

The correct option is;

(A) There is convincing evidence that there is no difference in the mean delivery times.

Step-by-step explanation:

Here we have the formula for the two-sample t-test given s;

To Texas N₁ = 12, =8.74 σ₁ = 2.92 SE Mean₁ = 0.84

To Japan N₂ = 9 = 6.75 σ₂ = 2.56 SE Mean₁ = 0.85

t = 1.667

Where the null hypothesis is

mu To Texas = mu To Japan and the alternative is

mu To Texas > mu To Japan

Here since the observed P value of P = 0.058 is greater than the significance level of 0.05 we fail to reject the null hypothesis and we will therefore, not accept the alternative hypothesis.

Hence, there is convincing evidence that there is no difference in the mean delivery times.

3 0

2 years ago

How are observational studies of populations different from experimental studies? What can be learned from observational populat

WINSTONCH [101]

Answer:

In an observational study, we measure or survey members of a sample without trying to affect them. In a controlled experiment, we assign people or things to groups and apply some treatment to one of the groups, while the other group does not receive the treatment.

Explanation:

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3 years ago

Given the function f(x) = 3(x – 2)2 + 4 with a restricted domain of x ≥ 2, which of the following represents f–1(x)?.

Debora [2.8K]

The inverse of the function is $f^{-1}x= \sqrt{\frac{x-4}{3} } + 2$