Answer:
D) ion
Explanation:
A stable atom of calcium has 20 electrons
Answer:
moving the boxes and the furniture up to the fifth floor.
Explanation:
The work done when moving an object up or down is equal to its change of gravitational potential energy:
where
m is the mass of the object
g is the gravitational acceleration
is the change in height of the object
We have two opposite situations:
1) when an object is moved upward, is positive, so the work done W is positive as well: this means that we need to do work in order to move the object, because we have to "win" the effect of gravity, which pulls the object downward
2) when an object is moved downward, is negative, so the work done W is negative as well: this means that we do not need to do work on the object, because it is already done by gravity, which pulls the object downward.
Therefore, more work is done when we are moving the boxes and the furniture up to the fifth floor.
Converging only; diverging lenses<span> can only </span>produce upright images<span>which are reduced in size; an </span>inverted<span> and magnified </span>image<span> can be </span>produced<span> by a converging </span>lens<span> when the </span>object<span> is located between F and 2F. also know as t-6 over 6 the science oligical sign
hope this helped</span>
Answer:
<em>The collision last 0.83 s</em>
Explanation:
Using the equation of motion,
S = (v+u)t/2 ........................ Equation 1
making t the subject of the equation,
t = 2S/(v+u)..................... Equation 2
Where S = distance, v = final velocity, u = initial velocity, t = time
Given: v = 0 m/s, u = 29.0 m/s, S = 1.20 m,
Substituting these values into equation 2
t = 2(1.2)/(29+0)
t = 2.4/29
t = 0.83 sec.
<em>Thus the collision last 0.83 s</em>
D. The graduated cylinder is used to find the volume, and triple beam balance is used to find the mass.
