Explanation:
In a solid, molecules are held together by strong intermolecular forces of attraction. As a result, they are unable to move from their initial place but they can vibrate at their mean position.
Hence, in solid substances the molecules have low kinetic energy.
Whereas in liquids, the molecules are held by less strong intermolecular forces of attraction as compared to solids. Due to which they are able to slide past each other. Hence, they have medium kinetic energy.
In gases, the molecules are held by weak Vander waal forces. Hence, they have high kinetic energy due to which they move rapidly from one place to another leading to more number of collisions.
Hence, gases are able to expand more rapidly as compared to liquids.
Therefore, we can conclude that in gaseous phase the space between particles tend to increase.
For the answer to the question above asking which procedure should he use if <span>Craig is modeling the discovery of electromagnetism?
The answer to this question is he shouldn't </span><span>bring a compass near a wire that has an electric current</span>
Answer:
(a) by friction on the tires while a car is accelerating without skidding.
Explanation:
Negative Work is done, when the body moves in a direction, that is completely opposite to the direction of the force applied. Thus, the angle between force and displacement becomes 180°, and the Cos 180° in formula gives -1.
(a) Since, the frictional force acts opposite to the direction of motion of the car or tires. Therefore, negative work can be done by friction.
(b) The motion of spring is in the direction of force. Thus, it does not give negative work.
(c) Since, the ball finally stops in handle. Thus this is not the case of negative work.
Therefore, the correct answer is:
<u>(a) by friction on the tires while a car is accelerating without skidding.</u>
The reaction is currently unbalanced (so the third option is immediately wrong). There are more hydrogens and chlorines on the right side, so the number of 
molecules on the left side should be increased. This means the last option is correct.
Answer:
(a) 918.5 m
(b) 334 m from the nearest mountain and 584.5 m from the furthest mountain
Explanation:
Echo is a reflected sound so the time taken is for twice the actual distance
Let the distance between the nearest mountains and man = x m
and the distance between furthest mountains and man = y m
Distance between two mountains = ( x + y ) m
Total distance covered by sound to produce first echo
= 2x m and time = 2 sec
=> 2y = 334 x 2
=> x =(334 x 2)/2 = 334 m
Total distance covered by sound to produce 2nd echo = 2y m and time = 3.5 sec
=> 2y = 334 x x 3.5
=> y = (334 x 3.5)/2 = 584.5 m
So, Distance b/w two clif = ( 334 + 584.5) = 918.5 m
(b)
The location
The man is 334 m from the nearest mountain and 584.5 m from the furthest mountain
