Answer:
N = 731 N
Explanation:
From the question, we recall the following
The mass m = 250 kg
The initial kinetic energy T₁ = 0
The initial kinetic energy T₂ = 1/2 mv²
velocity = v at B
thus,
The work is carried out because of the weight
so,
U₁→₂ = W * h
= (250 * 9.81) * (27 m - 27 cos 40 m)
which is =15491.95 N.m
From the energy principle - from work
T₁ + U₁→₂ = T₂
We can say,
0 + 15491.95 N.m = 1/2 * 250 kg * v²
v = 11.13 m/s
Now we solve for the normal acceleration
aₙ = v²ρ = (11.13 m/s)²/27 m
aₙ = 4.588 m/s²
Now, by applying the second law
∑Fy = -maₙ
or we say that, N - W cos 40° = -maₙ
so,
N = 250 * 9.81 N cos 40° - 250 kg * 4.588 m/s²
Therefore N = 731 N
Answer:
2
Explanation:
Step 1: RxN
4Al + 3O₂ → Al₂O₃
Step 2: Balance RxN
We have 4 Al's and 6 O₂'s on the reactant side.
We need the same number of Al's and O₂'s on the product side.
4Al + 3O₂ → 2Al₂O₃
This would prove that gold is an <em>element</em>. No matter how far down you
examine it, you never find any particles of anything except gold.
An example of a different case is salt.
-- Imagine you had a block of salt and decided to cut it in half.
-- If you repeated this process, then eventually, at some point, you'd have
a tiny particle of salt in front of you, just like before. BUT ...
-- Just as you were getting ready to cut this one in half, you'd notice that this
particle of salt is different. It's one atom of sodium stuck to one atom of chlorine,
and if you cut it in half, you would not have ANY salt. <span />
This would prove that salt is a <em><u>compound</u></em>, made of atoms of two or more elements.
Fnet=Fapp
manet=Fapp
Solve for m
m=Fapp/anet
m=100N/4m/s^2
so mass must equal 25kg
Assuming this is a frictionless surface
Answer:
Add Ff from Fa
Explanation:
Fnet = sum of all force
horizontal net force = Ff + Fa