Answer:
a).
b).
c). Δ
Explanation:
ΔE=kinetic energy
a).
b).
c).
net work= EkA+EkB
Which is an example of transfroming potential energy to kinetic
2 answers:
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Answer:
A) 0.660 g/ml
B) 1.297 ml
C) 0.272 g
Explanation:
Every substance, body or material has mass and volume, however the mass of different substances occupy different volumes. This is where density appears as a physical characteristic property of matter that establishes a relationship between the mass
of a body or substance and the volume
it occupies:
(1)
Knowing this, let's begin with the answers:
<h2 /><h2>Answer A:</h2>Here the mass is and th volume
Solving (1) with these values:
(2)
(3)
In this case the mass of a sample is and its density is
.
Isolating from (1):
(4)
(5)
(5)
In this case the volume of a sample is and its density is
.
Isolating from (1):
(6)
(7)
(8)
Momentum is conserved if and only if sum of all forces which are exserted on system equals zero. In our situation there are only internal forces, so by Newton's third law their vector sum is 0.
So .
Kinetic energy of system at first: . After:
. The secret is that other energy is in work of deformation forces (they in turn heat a bullet and a block).
Answer is A)