Answer:
1.32 × 10⁻⁹ N, - 1.32 × 10⁻⁹ N
Explanation:
distance between the charges r ₀ = 0.46 nm + 0.131 nm = 0.591 nm = 0.591 × 10⁻⁹ m
Using Coulomb's law,
Force of attraction = (Z₁)(Z₂)q² / ( 4 πε₀r₀²) where
Z₁ = valency of divalent = +2
Z₂ = valency of monovalent = -1
ε₀ = 8.85 × 10⁻¹² C/ (Nm²)
Fa = (1 × 2 × ( 1.602 × 10⁻¹⁹ C)²) / (4 π ( 8.85 × 10⁻¹² C/Nm² ) ( 0.591 × 10⁻⁹ m)² )
Fa = 1.32 × 10⁻⁹ N
b) Force of repulsion = force of attraction = - 1.32 × 10⁻⁹ N at equilibrium
Answer: (A) Security regression testing
Explanation:
The security regression testing is used to prevent the re-occurring process. The regression testing is the type of the testing that intends to affirm that a program or code or application changes has not influenced existing highlights and it keeps up the agenda.
The agenda ought to be similarly identified with necessity that was concluded. By checking this both then relapse testing occurs and this won't reoccurred from next time.
The regression testing improvements groups must ensure that changes, updates and new discharges don't presents imperfections and vulnerabilities that could be misused by the people.
Answer:
Explanation gives the answer
Explanation:
% Using MATLAB,
% Matlab file : fieldtovar.m
function varargout = fieldtovar(S)
% function that accepts single structure as input, assigning each
% of the field values to user-defined variables
fields = fieldnames(S); % get the field names of the input structure
% check if number of user-defined variables and number of fields in
% structure are equal
if nargout == length(fields)
% if equal assign each value of structure to user-defined varable
for i=1:nargout
varargout{i} = getfield(S,fields{i});
end
else
% if not equal display an error message
error('The number of output variables does not equal the number of fields');
end
end
%This brings an end to the program
Answer:
c) site preparation
Explanation:
A construction process can be defined as a series of important physical events (processes) that must be accomplished during the execution of a construction project.
Generally, in the construction of any physical asset such as offices, hospitals, schools, stadiums etc, the first step of the construction process is site preparation. Site preparation refers to processes such as clearing, blasting, levelling, landfilling, surveying, cutting, excavating and demolition of all unwanted objects on a piece of land, so as to make it ready for use.
This ultimately implies that, site preparation should be the first task to be accomplished in the construction process.
Hence, the construction process typically begins with site preparation before other activities such as the laying of foundation can be done.
Additionally, construction costs can be defined as the overall costs associated with the development of a built asset, project or property. The construction costs is classified into two (2) main categories and these are; capital and operational costs.
Answer:
Continuous
Explanation:
There is little need for flexibility in a continuous system.
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