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Answer \|/
Ice is less dense than water.
Reason why \|/
When water freezes the molecules inside completely stop moving (They still vibrate but don't change their position much). In doing so, they spread out a touch which makes it less dense than liquid water. So ice floats
Answer:
4ms^-2
Explanation:
m = 45Kg, Frictional force = 120N, Applied force = 300N, a = ?
Firstly, you find the net force acting on the body
Net force = Applied force - Frictional force
Net force = 300N - 120N = 180N
F = 180N
using the formula for Force
F = ma
Then making acceleration subject of the formula; you will get:
a = F/m
a = 180N/45Kg
a = 4ms^-2
Explanation:
Height of object =5cm
Position of object, u=−25cm
Focal length of the lens, f=10cm
Position of image, v=?
We know that,
v
1
−
u
1
=
f
1
v
1
+
25
1
=
10
1
v
1
=
10
1
−
25
1
So,
v
1
=
50
(5−2)
That is,
1
=
50
3
So,
v=
3
50
=16.66cm
Thus, distance of image is 16.66cm on the opposite side of lens.
Now, magnification =
u
v
That is,
m=
−25
16.66
=−0.66
Also,
m=
heightofobject
heightofimage
or
−0.66=
5cm
heightofimage
Therefore, Height of image =3.3cm