Answer:
Scientific laws are theories that have been tested, proven, and adopted as laws.
Explanation:
When a phenomenon is observed, in order to understand the reason behind it, scientists form a hypothesis. Then, they design a scientific experiment to test it. Data is collected, analyzed and results are written. Multiple testing is done and when the same result is concluded, the theory is proven and adopted as laws.
So, scientific laws are tested and proven theories which describe phenomenons in general.
Answer:
2.7%
Explanation:
Given:
Uncertainty of the speedometer (u)= 2.5km/h
Speed measured at that uncertainty (v) = 92km/h
Percent uncertainty (p) is given as the ratio of the uncertainty to the speed measured then multiplied by 100%. i.e
p = 
%
p = 
%
p = 2.7%
Therefore, the percent uncertainty is 2.7%
Answer:
0.0000333 m³/s
Explanation:
using Bernoulli's equation
P1 + 1/2ρv1² + ρh1g = P2 + 1/2ρv2² + ρh2g
P1 = P2 both are atmospheric pressure; they cancel out
1/2ρv1² + ρh1g = 1/2ρv2² + ρh2g divide both side with ρ (rho)
1/2v1² + h1g = 1/2v2² +h2g
collect the like terms
h1g - h2g = 1/2v2² + 1/2v1²
multiply both side by 2 and take g out from the left equation
2g(h1 - h2) = v2² + v1² where v1 is approximately 0 assuming the surface of the tank is large
v2² = 2g(h1 - h2)
take square root of both sides
v2 = √2g(h1 - h2)
h1 = 3.75 + 6.5 = 10.25
h2 = 6.5
v2 = √2g(h1 - h2) = √ (2×9.81× (10.25 - 6.5)) = 8.6 m/s
Volume in m³/s = A × v where A is the area of the hole and the radius of the hole = 2.22 mm / 2 (where 2.22 mm is the diameter of the hole) = 1.11 mm and 1.11mm / 1000 to convert it to meters
Area of the hole ( assuming it is a circle) = πr² = 3.142× (1.11/1000)²
Area = 0.00000387 m²
Volume in M³/s = 0.00000387 × 8.6 = 0.0000333 m³/s
Answer:
the real answer is current
Explanation:
i took the test
