Calcium loses two electrons when
forming an ionic bond with another ion. This is because calcium belongs to
Group II of the Periodic Table of Elements. This means that it has two
electrons in its outer shell. When forming an ionic bond with another element,
Calcium can give up this two electrons.
Question:
Two 6.7 kg bodies, A and B, collide. The velocities before the collision are 
and 
. After the collision 
, 
. What are (a) the x-component and (b) the y-component of the final velocity of B? (c) What is the change in the total kinetic energy (including sign)?
Answer:
(a) 50 m/s
(b) 35.6 m/s
(c) -735.16 J
Explanation:
Given,
Change in kinetic energy = final kinetic energy - initial kinetic energy
Answer:
1: is A
2: is C
Explanation:
1: because all other option would imply that the truck was not moved from from its previous position due to the lack of work / force exerted by the car
2: this is because the less dense ball will have less opposing force action on it causing it to move / accelerate / go at a faster speed
Formula:
Speed = Distance ÷ Time
Solution:
Speed = 60 ÷ 20
= 3km/min
Complete question is;
Three grams of the same substance in different phases are stored in three different containers. Each container is barely large enough to hold the substance. Which statement can be known about the behavior of the atoms in each container?
A) The atoms in the solid would be moving vigorously around the container.
B) The atoms in the liquid would be vibrating in position.
C) The atoms in the solid would be vibrating in position.
D) The atoms in the gas would be moving slowly around the container.
Answer:
Option C - The atoms in the solid would be vibrating in position
Explanation:
Option A is wrong because the molecules in solids are held together by strong inter molecular forces and therefore can't move about freely but instead will vibrate in their position.
Option B is wrong because the atoms in liquid are more free than those in solids. Thus they will not have room to vibrate.
Option C is correct from the explanation from option A.
Option D is wrong because the atom of the gas would be very loose and free and would therefore be moving very fast around the container
