When something is heated or cooled, its length changes by an amount proportional to the original length and the change in temperature: linear expansion : ΔL=αL0ΔT (α is the coefficient of linear expansion) The coefficient of linear expansion depends only on the material an object is made from.
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The following choice that is NOT a way that machines provides a mechanical advantage is to change direction. The correct answer is A.
Calculate the kinetic energy of an 86-kg scooter moving at 18 m/s?
K.E. = (1/2)mv^2
K.E. = (1/2)86 * 18^2
K.E. = (Answer Unit) =====> J
M = 86kg
V = 18 m/s
Significant Figures ======> 6
Answer: ======>
KE = 13932 J
Show work:
1/2 * 86 * 18^2
(1/2)86 * 18^2
Remove Parenthesis:
a = a
1/2 * 86 * 18^2
Multiply Fractions:
a * b/c = a * b/c
= 1 * 86 * 18^2/2
Multiply the numbers:
1 * 86 = 86
18^2 * 86/2
Divide the numbers:
86/2 = 43
18^2 * 43
18^2 = 324
43 * 324
Multiply the numbers:
43 * 324
13932
Therefore, Your answer is KE = 13932 J
Hope that helps!!!! : ) sorry for the long explanation!!!
M/s absorbed per second, is simply the external force, relationship between theforce<span> on an object and the </span>rate of change<span> of its </span>momentum<span>; valid only if the </span>force<span> is constant. This is just a restatement of Newton's second law, and in fact Newton originally stated it this way. ... This can be equated to a </span>force<span>.</span>
