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
The true statements about magnetic fields and forces will be A,D and E.
<h3>What is a magnet?</h3>
An iron piece,alloy, or other substance with its constituent atoms arranged in such a way that it shows magnetism qualities,
The function of the magnet is attracting other iron-containing objects or aligning itself in a magnetic field.
There are two poles of the magnet;
1. North Pole.
2. South Pole.
The same poles repel each other, while the opposite poles attract each other. In a sense, south-south and north-north repel. While the north-south and the south-north attract each other.
The correct statements are;
(A). The north pole attracts the south pole of a magnet.
(D)Forces caused by magnetic fields are weaker farther from the magnet.
(E)Magnetic forces can act on an object even if the object isn't touching the magnet.
Hence, the true statements about magnetic fields and forces will be A,D and E.
To learn more about the magnet, refer to the link;
brainly.com/question/13026686
#SPJ1
The amount of gravitational potential energy acquired by the rock is equal to:
where
m is the mass of the rock
g is the gravitational acceleration
is the increase in height of the rock
Substituting the data of the problem, we find
So, Natalie gave 220.7 J of energy to the rock.
Answer:
When like charges come together, they repel each other. For instance, when the north and south poles of a magnet come together, they push each other apart. The like poles in the magnet repel each other and unlike poles attract each other much. The same reaction occurs in like and unlike charges. Also, the repulsion acts along the line between the two charges.
It is 3.2 because you add 2.3 and 4.1 then divide your answer by 2.
