The charges for four ions are sodium (Na) +1, calcium (Ca) +2, fluorine (F) –1, and sulfur (S) –2. Which would be an ionic bond
that could form from any of these ions?
A.NaCa2
B.Na2S
C.CaF
D.FS
A.NaCa2
B.Na2S
C.CaF
D.FS
2 answers:
Answer: B.
Explanation: An ionic bond is formed when an element completely transfers its valence electron to another element. Ionic bond is formed between a metal and an non-metal.
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here is having an oxidation state of +1 and sulfur has an oxidation state of -2. Thus they combine to form neutral
.
is having an oxidation state of +2 and fluorine has an oxidation state of -1. Thus they combine to form neutral
. and not
.
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Answer:
The centripetal force acting on the child is 39400.56 N.
Explanation:
Given:
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Radius of the barrel is,
Number of revolutions are,
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Therefore, the time period of the child is given as:
Now, angular velocity is related to time period as:
Now, centripetal force acting on the child is given as:
Therefore, the centripetal force acting on the child is 39400.56 N.
Answer:
1)
2)
Explanation:
<u>Projectile Motion</u>
When an object is launched near the Earth's surface forming an angle with the horizontal plane, it describes a well-known path called a parabola. The only force acting (neglecting the effects of the wind) is the gravity, which acts on the vertical axis.
The heigh of an object can be computed as
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is the vertical component of the initial velocity and t is the time
The y-component of the speed is
1) We'll find the vertical component of the initial speed since we have not enough data to compute the magnitude of
The object will reach the maximum height when . It allows us to compute the time to reach that point
Solving for
Thus, the maximum heigh is
We know this value is 8 meters
Solving for
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2) We know at t=1.505 sec the ball is above Julie's head, we can compute