if a theory can be verified by an experiment ten it's a good theory. if an expt contradicts a theory, theory is wrong.
at CERN in europe, a new fundamental particle was said to be found.
Professor Peter Higgs had a theory predicting it.
called the "higgs boson" he got a nobel prze for the boson.
a partcle of light = a photom = a boson ...
I think C because it's the only one with a an angle T of 30° (The string)
Answer:
The standard deviation of corrected pH is
5.64 , 1.32
Explanation:
To find the measurements pH given
μx = 4.60 , σx = 1.10
So using the measurement as a pH
μₐX + b = aμ X + b
μ1.2 x + 0.12
1.2 (4.60) + 0.12 = 5.64
σₐX +b = a σ X
σ 1.2 X + 0.12
1.2 (1.10) = 1.32
Answer:
E. 1 x 10⁴ N
Explanation:
First we will calculate the final velocity of man when he hits the air bag. For that we apply third equation of motion to the motion from the top of building to air bags:
2as = Vf² - Vi²
where,
a = acceleration due to gravity = g = 9.8 m/s²
s = height = h 125 m
Vf = Final Speed = ?
Vi = Initial Speed = 0 m/s
Therefore,
2(9.8 m/s²)(125 m) = Vf² - (0 m/s)²
Vf = √(2450 m²/s²)
Vf = 49.5 m/s
Now, we apply the 3rd equation of motion to the decelerating motion of air bag:
2as = Vf² - Vi²
where,
a = ?
s = 5 m
Vf = 0 m/s
Vi = 49.5 m/s
Therefore,
2(a)(5 m) = (0 m/s)² - (49.5 m/s)²
a = (-2450 m²/s²)/(10 m)
a = -245 m/s²
negative sign for deceleration
a = 245 m/s²
Using Newton's Second Law of Motion:
F = ma
where,
F = Average force Applied by Air bags
m = mass of man = 70 kg
a = deceleration = 245 m/s²
Therefore,
F = (70 kg)(245 m/s²)
F = 1.7 x 10⁴ N
So, the correct option is:
<u>E. 1 x 10⁴ N</u>
Answer:
A. Both sources are positively charged.
Explanation:
Before answering, let's remind what is the direction of the electric field lines for a positive charge and a negative charge. Keeping in mind that the direction of the field lines is given by the direction of motion of a positive test charged place in that electric field, we have:
- For a positive charge, field lines point away from the charge (because a positive test charge will move away from the source of the field)
- For a negative charge, field lines point towards the charge (because a negative test charged will move towards the source of the field)
In this example, we see that field lines point away from both charges A and B. therefore, both sources are positively charged.