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3 years ago

Which describes an object in projectile motion? Check all that apply.

2 answers:

8 0

When an object is thrown near the Earth's surface than it has a projectile motion. The thrown object is called projectile. The projectile is influenced by the gravity and moves along a curved path.<span>A projectile has an initial velocity, which is either horizontal or upward at an angle.</span>
An object in projectile motion is described with the following statements:
- <span>Gravity acts to pull the object down.
</span>- The path of the object is curved.

VladimirAG [237]3 years ago

5 0

IT - Gravity acts to pull the object down.

- The path of the object is curved.

that the answer i got it Right on the test

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2 years ago

In the biosphere, prey represent a food source for predators. An increase in the population of prey means more food for predator

mote1985 [20]

<h2>Answer:</h2>

An increase in the population of prey means more food for predators, which will<u> increase</u> the predators' population. As a result, many more prey will be hunted, causing the prey population to<u> decrease.</u> In response, the predator population will <u>decrease</u>, resulting in an increase in the prey population.

<h3>Explanation:</h3>

The feedback loop is control of the system containing the prey and predator.

In this loop, the population of predator is directly proportional to prey but the population of prey is inversely proportional to a predators population.

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3 years ago

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2 years ago

What are the oxidation numbers of the elements in the nitrite ion

zepelin [54]

Answer : The oxidation number of nitrogen and oxygen in nitrite ion is, (+3) and (-2) respectively.

Explanation :

Oxidation number : It represent the number of electrons lost or gained by the atoms of an element in a compound.

Oxidation numbers are generally written with the sign (+) and (-) first and then the magnitude.

When the atoms are present in their elemental state then the oxidation number will be zero.

Rules for Oxidation Numbers :

The oxidation number of a free element is always zero.

The oxidation number of a monatomic ion equals the charge of the ion.

The oxidation number of Hydrogen (H) is +1, but it is -1 in when combined with less electronegative elements.

The oxidation number of oxygen (O) in compounds is usually -2, but it is -1 in peroxides.

The oxidation number of a Group 1 element in a compound is +1.

The oxidation number of a Group 2 element in a compound is +2.

The oxidation number of a Group 17 element in a binary compound is -1.

The sum of the oxidation numbers of all of the atoms in a neutral compound is zero.

The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion.

The given molecule is, $NO_2^-$

Let the oxidation state of 'N' be, 'x'

$x+2(-2)=-1\\\\x-4=-1\\\\x=-1+4\\\\x=+3$

Therefore, the oxidation number of nitrogen and oxygen in nitrite ion is, (+3) and (-2) respectively.

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3 years ago