Three children want to play on a see saw that is 6 meters long and has a fulcrum in the middle. Two of the children are twins and weigh 40 kg each and sit on the same side at a distance 2m and 3m away from the fulcrum. The other child weighs 80 kg. How far away should he sit from the fulcrum so that the see saw is balanced
Answers
Given Information:
mass of child 1 = m₁ = 40 kg
distance from fulcrum of child 1 = d₁ = 2 m
mass of child 2 = m₂ = 40 kg
distance from fulcrum of child 2 = d₂ = 3 m
mass of child 3 = m₃ = 80 kg
Required Information:
distance from fulcrum of child 3 = d₃ = ?
Answer:
distance from fulcrum of child 3 = 2.5 m
Explanation:
In order to balance the see-saw, the moment of force should be same on both sides of the fulcrum.
Since 2 children are sitting on one side and only 1 on the other side
F₁d₁ + F₂d₂ = F₃d₃
Where Force is given by
F = mg
m₁gd₁ + m₂gd₂ = m₃gd₃
m₁d₁ + m₂d₂ = m₃d₃
Re-arrange the equation for d₃
m₃d₃ = m₁d₁ + m₂d₂
d₃ = (m₁d₁ + m₂d₂)/m₃
d₃ = (40*2 + 40*3)/80
d₃ = 2.5 m
Therefore, the child on the other side should sit 2.5 m from the fulcrum so that the see-saw remains balanced.
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PLEASE HELP!!! Sophia says that if we add two electrons to oxygen in order to fill its valence shell, it’s expected charge would be +2. Is she correct? If not, explain the error in her thinking.
Answers
Answer:
Solvent
Explanation:
- A solution is a substance that is made by dissolving one component in another.
- It is made up of a solvent and a solute.
- The component that dissolves the other is known as solvent. Examples of solvents include water, ethanol, milk, chloroform, etc.
- The component that dissolves in the other is known as the solute. Examples of solute include salts, sugar, etc.
- For example in an aqueous solution of sodium chloride(NaCl); sodium chloride salt is the solute while water is the solvent.
Answers
Answer:
a. 12.12°
b. 412.04 N
Explanation:
Along vertical axis, the equation can be written as
T_1 sin14 + T_2sinA = mg
T_2sinA = mg - T_1sin12.5 ....................... (a)
Along horizontal axis, the equation can be written as
T_2×cosA = T_1×cos12.5 ......................... (b)
(a)/(b) given us
Tan A = (mg - T_1sin12.5) / T_1 cos12.5
= (176 - 413sin12.5) / 413×cos12.5
A = 12.12 °
(b) T2 cosA = T1 cos12.5
T2 = 413cos12.5/cos12.12
= 412.04 N
Answer:
Magnitude - 11.83 Degree
Direction - 422.42 N
Explanation:
Given data:
Downward force on wire 176 N
Angle made by left section of wire 12.5 degree with horizontal
Tension force = 413 N
From figure
Applying quilibrium principle at point A
The vertical and horizontal force is 0
then we have
........1
.......2
.......3
divide equation 3 by 1
we get
...........4
from equation 3 and 4
T = 422.42 N
Answers
Answer: The speed of the moon's rotation keeps the same side always facing Earth.
Explanation: Please mark me brainiest
Answer:
The speed of the Moon's rotation keeps the same side always facing Earth.
Explanation:
got it right on study island :)
B) must be accelerating
C) may be slowing down
D) may be moving at constant speed
Answers
Answer:
hmmm thats too hard for me.
Explanation:
Answers
Answer:
i believe that it is d
Explanation:
Final answer:
In a super heater, the temperature of the steam rises while the pressure remains constant. This process helps to remove the last traces of moisture from the saturated steam.
Explanation:
In a super heater, the conclusion is that option (C) pressure remains constant and temperature rises is the correct choice. A super heater is a device used in a steam power plant to increase the temperature of the steam, above its saturation temperature. The function of the super heater is to remove the last traces of moisture (1 to 2%) from the saturated steam and to increase its temperature above the saturation temperature. The pressure, however, remains constant during this process because the super heater operates at the same pressure as the boiler.
Learn more about Super heater here:
#SPJ2
b. counterclockwise
c. There is no induced current in the coil.
Answers
Answer:
Option B
Explanation:
As per the Lenz’s law of electromagnetism the current induced in a conductor due to any change has a tendency to oppose the change which is causing this induces current.
Thus, when a constant magnetic field with an electric circuit is varied, it produces and induced current which flow in a direction such that its sets a magnetic field that tries to restore the flux
Hence, option B is correct