According to law of conservation of mass, mass of reactant = mass of products
So answer is C
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Answer: D. An action-reaction force pair
Explanation: When you sit in your chair, your body exerts a downward force on the chair and the chair exerts an upward force on your body. There are two forces resulting from this interaction - a force on the chair and a force on your body. Another example would be a person pushing against a wall (action force), and the wall exerts an equal and opposite force against the person.
What’s the rest of the question or is that it?
After reading this whole question, I feel like I've already
earned 5 points !
-- Two satellites at the same distance, different masses:
The forces of gravity between two objects are directly
proportional to the product of the objects' masses. In
other words, the gravitational forces between the Earth
and an object on its surface are proportional to the mass of
the object. In other words, people with more mass weigh more
on the Earth, and the Earth weighs more on them.
If the satellites are both at the same distance from Earth,
then the Earth pulls on the one with more mass with greater
force, and also the one with more mass pulls on the Earth
with greater force.
-- Two satellites with the same mass, at different distances:
The forces of gravity between two objects are inversely
proportional to the square of the distance between them.
In other words, the gravitational
forces between the Earth
and an object are inversely proportional
to the square of
the distance between the object and the center of the Earth.
If
the satellites both have the same mass, then the Earth
pulls on the nearer one with greater force, and also the
nearer one pulls on the Earth with greater force.
-- Resistor in a circuit when the voltage changes:
The resistance depends on how the resistor was manufactured.
Its resistance is marked on it, and doesn't change. It remains
the same whether the voltage changes, the current changes,
the time of day changes, the cost of oil changes, etc.
If you increase the voltage in the circuit where that resistor is
installed, the current through the resistor increases. If the current
remains constant, then you can be sure that somebody snuck over
to your circuit when you weren't looking, and they either installed
another resistor in series with the original one to make the total
resistance bigger, or else they snipped the original one out of the
circuit and quickly connected one with more resistance in its place.
Answer:
Explanation:
Given that,
One fragment is 7 times heavier than the other
Let one fragment mass be M
Let this has a velocity v
And the other 7M
And this a velocity V
Initially the fragment is at rest u = 0
Applying conservation of momentum
Momentum is given as p=mv
Initial momentum = final momentum
Po = Pf
(M+7M) × 0 = 7M •V − Mv
0 = 7M•V - Mv
Divide both sides by M
0 = 7V -v
v = 7V
Since friction decelerates the masses to zero speed, we can calculate the NET work on the individual blocks and relate this quantity to the change in kinetic energy of each block
The workdone by the 7M mass is
Distance moved by 7M mass is 6.8m, Then, d =6.8m
W = fr × d
Where fr = µkN
When N=W =mg, where m=7M
N= 7Mg
fr = −µk × 7mg
Then, W(7m) = −7µk•Mg×d
W(7m) = −7µk•Mg×6.8
W(7m) = −47.6 µk•Mg
Then, same procedure,
Let distance move by the small mass be m
Work done by M mass
W(m) = −µk•Mg×d'
Since it is a wordone by friction, that is why we have a negative sign.
Using conservation of energy
Work done by 7M mass is equal to work done by M mass
W(7m) = W(m)
−47.6 µk•Mg = −µk•Mg×d
Then, M, g and µk cancels out
We are left with
-46.7 = -d
Then, d = 46.7m
