A bird is flying horizontally at 9.12 m/s. Suddenly, the bird drops a small stone that it was carrying with its
1 answer:
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Answer:
Option B is correct.
Explanation:
The resistance of a material or wire is represented by the formula below.
R=(ρL)/A
where
- R is resistance of wire
- ρ is the resistivity of the material
- A is the cross sectional area of wire
- L is length of wire
Resistance increases with increase in length and resistivity which means options C and D are wrong.
A=(π)/4
An increase in diameter will result in a proportional increase in area
From the resistance formula, an increase in area will cause a reduction in the resistance of the material.Thus increased diameter of wire will lower the resistance of wire. Option B is correct
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<h2>Right answer: 64 units</h2><h2></h2>
According to the law of universal gravitation, which is a classical physical law that describes the gravitational interaction between different bodies with mass:
Where:
is the module of the force exerted between both bodies
is the universal gravitation constant.
and
are the masses of both bodies.
is the distance between both bodies
In this case we have a gravitation force , given by the formula written at the beginning. Let’s rename the distance
as
:
(1)
And we are asked to find the gravitation force with a given distance of
:
(2)
The gravity constant is the same for both equations, and we are assuming both masses are constants, as well. So, let’s isolate in both equations:
From (1):
(3)
From (2):
(4)
If (3)=(4):
(5)
Now we have to find :
(6)
If :
>>>>This is the new force of attraction
Answer:
Explanation:
From the question we are told that:
Average distance
Generally the equation for change in electric potential energy is mathematically given by
Where
U_1=0 Because of initial lengthy distance apart
And
Therefore