Answer:
Energy needed = 54.02 J
Explanation:
the Energy in an elastic spring from hookes law is given as
F= ke , therefore the energy (E) is
E = 
K = 19.5 N/cm
e = 1.39cm
E = 
x 19.5 x 1.39
E = 13.55 J
The energy to stretch the spring for 6.93cm is
E = x 19.5 x 6.93
E = 67.57 J
The more energy needed for the further stretch is
67.57 - 13.55
Energy needed = 54.02 J
Answer:
They can give us information and energy.
Explanation:
Fossils can be burned to give us energy and fuel. They can also give us information about the earths history.
Answer:
Although there are only 118 elements that have been discovered and entered in the Periodic Table, there is an almost infinite multiplicity of things, materials, resources and other objects in the universe.
This is so because each of these elements can be combined with the others, varying its proportion and the inclusion of different elements, forming different things according to the proportion in which each element has been used.
D. A physical change means that the object can be broken into different pieces, but it still remains that same object.
This can happen because speed has nothing to do with something’s top speed. Acceleration is how quickly something can reach its top speed. The top speed of something is not determined by the rate it accelerates.
