What do we call the force used when someone is pushing a lawnmower across the yard?
2 answers:
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Answer:
Follows are the solution to the given question:
Explanation:
The rectangular part has a length of and its rectangular part has a width of
.
In option A
Calculating the area of the rectangular throgh the given piece:
In option B
Calculating the ratio of rectangle's width which is rectangle's length:
So, the ratio of rectangle's width to rectangle's length is 0.3557 .
In option C
Calculating the Perimeter of the rectangle:
In option D
Calculating the difference between length and width:
In option E
Calculating the ratio of length to width:
Answer:
(a). The HB of this material is 217.8
(b). The diameter of an indentation is 1.45 mm.
Explanation:
Given that,
Diameter of Brinell hardness D= 10.0 m
Diameter of steel alloy d= 2.4 mm
Load = 1000 kg
(a). We need to calculate the HB of this material
Using formula of Brinell hardness
Put the value into the formula
(b). Given that,
Hardness = 300 HB
Load = 500 kg
We need to calculate the diameter of an indentation
Using formula of diameter
Put the value into the formula
Hence,(a). The HB of this material is 217.8
(b). The diameter of an indentation is 1.45 mm.
The gravitational force is much larger than the electrical force for any distance between the particles.
Explanation:
The gravitational force between two particles is given by:
where
G is the gravitational constant
m1, m2 are the masses of the two particles
r is the separation between the two particles
The electric force between two particles is given by:
where
k is the Coulomb's constant
q1, q2 are the charges of the two particles
r is the separation between the two particles
In this problem, we are comparing the gravitational force and the electric force between a proton and a neutron.
We must immediately notice that the charge of the neutron is zero, since it is electrically neutral:
q = 0
This means that the electric force between the proton and the neutron is always zero, regardless of their distance. And therefore, since their masses is not zero (and the gravitational force is never zero), the correct answer is
The gravitational force is much larger than the electrical force for any distance between the particles.
Learn more about gravitational force:
About electrical force:
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