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
Answer:
(a) The elevator has an acceleration of 2.14 m/s² and direction is downward
(b) The acceleration is a=2.14 m/s²
Explanation:
Let +y be upward direction
For Part (a)
The mass of student (whose weight is 550N) is:
ms=w/g
ms=550/9.8=56.1 kg
Apply ∑Fy=ma
Solve for acceleration a
The elevator has an acceleration of 2.14 m/s² and direction is downward
Part(b)
For the acceleration is the scale reads 670 N
For n=670N
So
Answer:
E
Explanation:
There is not enough information in the question. A beat is the observed differences between two frequencies.
Hence, 3 beat represents a difference of 3-hertz between the two frequencies. So the frequency of the piano string could be 1056+3 = 1059-hertz or 1056-3= 1053-hertz.
In order to ascertain the actual value i.e if it is an increase or a decrease in frequency observed, we need more information.
Answer:
as I know about barometer consist of a mercury .
it can be made with a clean ,dry, thick walled glass tube of about one metre long .
the working mechanism can be given by:
when there is air pressure the mercury in the glass goes against the air pressure to balance itself .
If the weight of mercury is less than atmospheric pressure then the mercury will rise upwards and vice versa.
I think no need to explain the parts u can do it your self as it consist of testube and mercury as main components.if u want the explanation then use search engines to reshearch.
hope this helped you
comment if got any confusion .
Answer:26.65 kJ
Explanation:
Given
mass of skier=70 kg
length of ramp=62.5 m
slope
speed=3.77 m/s
so net force on skier must be zero
Net work done will be change in Potential energy of skier
Potential Energy
P.E.=26.65 kJ
