1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
OLga [1]
3 years ago
12

Which factors improve soil fertility? Select the three correct answers. A- earthworms B- horizons C- high pH D- Humus E- Bacteri

a
Physics
1 answer:
inysia [295]3 years ago
4 0
A- earthworms
Because they put nutrients and things in the soil which make it fertile.

The other two I’m not sure of.. maybe C and E
You might be interested in
Two wires, both with current out of the page, are next to one another. The wire on the left has a current of 1 A and the wire on
Soloha48 [4]

Answer:

C. The left wire attracts the right wire and exerts as much force as the right wire does.

Explanation:

To know what is the answer you first take into account the magnetic field generated by each current, for a distance of d:

B_1=\frac{\mu_oI_1}{2\pi d}=\frac{\mu_o}{2\pi d}(1A)\\\\B_2=\frac{\mu_oI_2}{2\pi d}=\frac{\mu_o}{2\pi d}(2A)=2B_1\\\\

Next, you use the formula for the magnetic force produced by the wires:

\vec{F_B}=I\vec{L}\ X \vec{B}

if the direction of the L vector is in +k direction, the first wire produced a magnetic field with direction +y, that is, +j and the second wire produced magnetic field with direction -y, that is, -j (this because the direction of the magnetic field is obtained by suing the right hand rule). Hence, the direction of the magnetic force on each wire, produced by the other one is:

\vec{F_{B1}}=I_1L\hat{k}\ X\ B_2(-\hat{j})=I_1LB_2\hat{i}=(2A^2)\frac{L\mu_o}{2\pi d}\hat{i}\\\\\vec{F_{B2}}=I_2L\hat{k}\ X\ B_2(\hat{j})=I_2LB_1\hat{i}=-(2A^2)\frac{L\mu_o}{2\pi d}\hat{i}

Hence, due to this result you have that:

C. The left wire attracts the right wire and exerts as much force as the right wire does.

6 0
4 years ago
If heat Q is required to increase the temperature of a metal object from 4 ∘C to 7∘C, the amount of heat necessary to increase i
alisha [4.7K]

Answer:

4Q

Explanation:

Case 1 :

m = mass of the metal

c = specific heat of the metal

\Delta T = Change in temperature = 7 - 4 = 3 C

Amount of heat required for the above change of temperature is given as

Q = m c \Delta T\\Q = m c (7 - 4)\\Q = 3 m c

Case 2 :

m = mass of the metal

c = specific heat of the metal

\Delta T = Change in temperature = 19 - 7 = 12 C

Amount of heat required for the above change of temperature is given as

Q' = m c \Delta T\\Q' = m c (12)\\Q' = (4)(3 m c)\\Q' = 4Q

Hence the correct choice is

4Q

6 0
3 years ago
Read 2 more answers
Which statement about the ellipsis is true?. . I. An ellipsis indicates the omission of a word or words.. . II. It is appropriat
V125BC [204]
<span>"the true statement is: An ellipsis indicates the omission of a word or word Here is an example on the usage of ellipsis: I don't know . . . i'm not even sure how i feel about him. The dots acted as an interlude that connected one response with another statement</span>
7 0
3 years ago
Read 2 more answers
A refrigerator
andrew11 [14]

From the definition of the first Law of thermodynamics we know that heat flows from the hottest object to the coldest. What has a refrigerator inside is a refrigerant that is traveling through some heat exchangers, driven by pumps and that allows the exchange of heat between a 'Hot' tank and then transport it to a certain place, eject it and return to extract more heat. In this way the refrigerant removes heat from a hot region to a cold region and heat enters said hot region. Since the heat extracted is greater than that of the medium, the heat from the inside flows outward.

The correct answer is B.

6 0
3 years ago
What are cirrus.cirrostratus. And cirrocumulus clouds made up of
Irina-Kira [14]
<span><span>1.       </span>All clouds are made up of tiny ice crystals or small water droplets that form together with a dust on the atmosphere.
Cirrus, cirrostratus and cirrocumulus are made up of ice crystals. It forms when the water vapor goes condensation at high altitudes in where the pressure on the atmosphere reaches the point from 600 mbar at 4000 meter above the sea level up to 200mbar at 12 000m above sea level. These clouds form thunderstorms, cyclones and contrails (a manmade cloud).</span> <span>

</span>



3 0
3 years ago
Other questions:
  • If an unknown element has a mass of 17 and contains 6 neutrons, how many protons does it have ?
    12·1 answer
  • If y gets smaller as x gets bigger and y have an ---------- relationship?
    5·1 answer
  • An object has a height of 0.066 m and is held 0.210 m in front of a converging lens with a focal length of 0.140 m. (Include the
    15·1 answer
  • Coal is how much worse than natural gas when it comes to carbon dioxide emissions?
    11·1 answer
  • Suppose a zero-resistance rod slides to the right on two zero-res a distance of 0.330 m. The rails are connected by a 16 2 resis
    8·2 answers
  • Energy is the capacity to do what ? motion or work
    14·1 answer
  • The bending of light as it passes into a transparent material of different optical intensity is known as
    14·1 answer
  • Explain how the particles of solids move
    12·1 answer
  • Complete the passage to describe the relationship between kinetic energy, internal energy, thermal energy, and
    14·2 answers
  • State pascal law and write three instrument which base unit?​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!