the answer is D. A magnesium atom donates two electrons to the fluorine atoms → Each fluorine atom accepts one of the electrons → The magnesium atom becomes a +2 ion → Each fluorine atom becomes a -1 ion
because magnesium only has 2 valence electrons, and it would be easier to lose electrons rather gain.
i just took the test, its right.
Answer:
v_max = (1/6)e^-1 a
Explanation:
You have the following equation for the instantaneous speed of a particle:
(1)
To find the expression for the maximum speed in terms of the acceleration "a", you first derivative v(t) respect to time t:
(2)
where you have use the derivative of a product.
Next, you equal the expression (2) to zero in order to calculate t:
For t = 1/6 you obtain the maximum speed.
Then, you replace that value of t in the expression (1):
hence, the maximum speed is v_max = ((1/6)e^-1)a
Explanation:
According to the law of conservation of energy,
......... (1)
As we know that, P.E = mgh
and, K.E =
Therefore, putting these values of P.E and K.E into equation (1) as follows.
Now, initial case is that its starts with 50.3 m/s at bottom.
P.E = m and PE = 0
And, as it reaches the height h,
P.E = mgh
So, K.E will be m
Hence, speed = 6 m/s
Answer:a=g
Explanation: when the ball is thrown downwards gravity is acting on the ball, there is no force opposing gravity therefore it's acceleration will be due to gravity acting on it that is why a=g