What is the difference between 3.15 m and 2.006 m with the correct number of significant figures
2 answers:
Answer:
S = 1.144
Explanation:
As we know that when we add or subtract two or more numbers then the final result must have same number of precision as that of numbers given in the problem
here we have
S = 3.15 - 2.006
so we have to give our result with 3 digits after decimal
so we will have
since it must have more precise digits so correct answer after subtraction must be
S = 1.144
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Explanation:
In order to solve the problem, we consider the forces acting on the upper mass only first.
The upper mass is acted upon three forces:
- The applied force
, upward
- The weight of the mass itself,
, where
is the upper mass and
is the acceleration of gravity, downward
- The tension in the string,
, downward
Therefore, the equation of the forces for the upper mass is:
where
is the acceleration (upward)
Solving for ,
Now we can find the lower mass by considering the forces acting on it:
- The tension in the string, T = 16 N, upward
- The weight of the mass itself,
, where
is the lower mass, downward
So the equation of the forces is
And solving for the mass,
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Answer:
Efficiency = 77%
Explanation:
Input energy = 570 J
Output energy = 440 J
To find the efficiency;
Substituting into the equation, we have;
Efficiency = 77.19 ≈ 77%
Therefore, the efficiency of the engine is 77 percent.