Answer:
20N
Explanation:
Given parameters:
Work done = 200J
Distance moved = 10m
Unknown:
Amount of force applied =?
Solution:
Work done is the force applied on a body to move it in the direction of the force.
Work done = force x distance
The unit of work done is in joules
Since the unknown is force, we make it the subject of the expression;
Force = 
Force = 
= 20N
No, if it takes less time, the acceleration is greater.
Hope this helps!
Answer:
0.853 m/s
Explanation:
Total energy stored in the spring = Total kinetic energy of the masses.
1/2ke² = 1/2m'v².................... Equation 1
Where k = spring constant of the spring, e = extension, m' = total mass, v = speed of the masses.
make v the subject of the equation,
v = e[√(k/m')].................... Equation 2
Given: e = 39 cm = 0.39 m, m' = 0.4+0.4 = 0.8 kg, k = 1.75 N/cm = 175 N/m.
Substitute into equation 2
v = 0.39[√(1.75/0.8)
v = 0.39[2.1875]
v = 0.853 m/s
Hence the speed of each mass = 0.853 m/s
From a quick scan, the quakes happen along plate boundaries as in tectonics. this is when a few trillion (1000 000 000 000) tons of earth move, albeit slowly, relative to each other, and various places feel the enormous forces generated. There is also the "ring of fire" which could be associated here as in the lines where volcanic activity occurs - witness Mt Etna, Sicilia, Italia, Europe at the moment.
Relative movements of these tons of earth can be head on (forming lumps in the earth aka ridges and mountains) or sliding against each other. Not wise places to go for relaxing quiet holidays ... unless the holiday maker is addicted to risk.
