What is the main difference between primary and secondary succession?A The climax of primary succession is pine forest
B Primary succession begins with bare rocks
C Secondary succession begins with mossed and lichens
D Secondary succession include frequent fires

Answers

Answer 1

Answer:

Answer:

Explanation:

Related Questions

An object's color is determined by the wavelengths of light that it _______. A. diffracts. B. reflects. C. refracts. D. absorbs.
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Through which one of the following mediums is the velocity of a sound wave the greatest? A. LeadB. AirC. WaterD. Steel
If a group of workers can apply a force of 1000 newtons to move a crate 20.0 meters on a frictionless ramp: How high up a ramp will the crate travel?

Light can travel through a medium, but it does not require a medium.
a. True
b. False

Answers

That's true. Light can travel through glass, water or jello,
but it also gets here very effectively through empty space,
from the sun and stars.

Recall that the height of an object t seconds after it begins moving when gravity is the only force acting on the object is given. h(t)=-16x^2 + v0t + h0. h(t) is given in feet. v0 = initial velocity of object in ft/sec. ho= initial height of object in feet. If the feather is dropped from the top of the bridge 90 feet above a river, how long does it take the feather to reach the water?

Answers

That's pretty easy, have a look :

$h(t)=−16x2=v0t+h0$
$v0=0 ft/sec$
$h0=90 ft$

The only thing you need to do is to find t and the problem is solved.

Answer:

Time taken, t = 2.37 seconds

Explanation:

It is given that,

Height of an object at time t is given by :

$h(t)=-16t^2+v_0t+h_0$

Where

v₀ is initial velocity of object

h₀ is initial height of the object

The feather is dropped from the top of the bridge 90 feet above a river. we have to find the time taken by the feather to reach the water.

At the surface of water, h(t) = 0 and v₀t = 0

So, $0=-16t^2+0+90$

t = 2.37 seconds

The feather will take 2.37 seconds to reach the water surface.

How does the direction of the change in velocity compared to the direction of the acceleration?

Answers

Technically, you can simply point out that "acceleration" MEANS
"change in velocity", so of course they have the SAME direction.

Actually, because acceleration is the derivative of velocity (or change of velocity at a certain point), the acceleration can be in a different direction than the velocity. If the velocity's magnitude is increasing away from zero, then the acceleration is in the same direction as velocity. If the velocity is getting closer and closer to zero (either from the negative or positive end of the number line) then the acceleration is in the opposite direction of velocity.
Think of it like a car. When you are slowing down to stop at a light, your velocity is still going forwards, but your acceleration is negative because it is decreasing the velocity. A negative acceleration is another way of saying that the acceleration is going in the opposite direction of the frame of reference.
If the car is speeding up, the velocity is forward, and the acceleration is in the same direction because the change of velocity is positive.
Hope this helped! :D

Based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released)endothermic
B2+C2-->2BC
A+BC-->AB+C

exothermic
AB+C-->AC+B
A2+C2-->2AC
A2+B2-->2AB

Answers

Exothermic reaction is a chemical reaction that releases energy. This reaction releases heat energy or light .In an endotermic reaction energy is used.Enthaply is the heat energy change , delta H.If the sum of the enthalpies of the reactans is greater than the products the reaction is exothermic. If the products side has a larger enthaply than the process is endothermic. So, if delta H is negative then the process is exothermic. If delta H is positive, than the process is endothermic.Exothermic are: A+BC -> AB+CA2+B2 -> 2ABEndothermic are:AB+C -> AC+BA2 + C2 -> 2ACB2+C2 -> 2BC

Final answer:

Classifying reactions as endothermic or exothermic depends on the comparison of energy required to break bonds in the reactants and energy released when new bonds are formed in products. Bond formation generally releases energy and is exothermic, while bond breaking absorbs energy and is endothermic. Therefore, reactions which make more or stronger bonds (AB+C-->AC+B, A2+C2-->2AC, A2+B2-->2AB) are likely exothermic, whilst those breaking more or stronger bonds (B2+C2-->2BC, A+BC-->AB+C) are likely endothermic.

Explanation:

Chemical reactions can be classified as endothermic if energy (usually in the form of heat) is absorbed from the surroundings, or exothermic if energy is released into the surroundings. The key here lies in understanding the concept of bond energy. Essentially, if more energy is required to break the bonds in the reactants than is released when new bonds are formed in the products, the reaction is endothermic. Conversely, a reaction is exothermic if less energy is required to break the bonds in the reactants than is released when new bonds are formed in the products.

Without exact bond energies, we can only hypothesize about the reactions. However, the general rule is that bond formation is exothermic while bond breaking is endothermic. Therefore, any reaction that results in the formation of more or stronger bonds than it breaks would likely be an exothermic reaction (AB+C-->AC+B, A2+C2-->2AC, A2+B2-->2AB). On the other hand, a reaction that requires breaking more or stronger bonds than it forms (B2+C2-->2BC, A+BC-->AB+C) would likely be endothermic.

Learn more about Endothermic and Exothermic Reactions here:

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Would a tiger be a consumer or producer?

Answers

Tigers don't produce anything useful, but they are the top of their food chain. They would e top predators, and top predators are always consumers.

Which of the following statements is true about Planck's Law?. . A. The frequency of the emitted light is inversely proportional to the energy given off by the electrons.. . B.The frequency of the emitted light is directly proportional to the energy given off by the electrons.. . C. The wavelength of the emitted light is directly proportional to the energy given off by the electrons.. .D. The wavelength of the emitted light is inversely proportional to the energy given off by the electrons.

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The statement that is true about Planck's Law is that the frequency of the emitted light is directly proportional to the energy given off by the electrons. The correct answer is B.

Which of the following statements is true about Planck's Law?

Answer: First we have to understand that Planck's law describes electromagnetic radiation. Out of all the statements shown above the option that is true about Planck's Law is B) The frequency of the emitted light is directly proportional to the energy given off by the electrons.

I hope it helps, Regards.

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