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Questions and Answers
What does the determinant of a matrix characterize?
What does the determinant of a matrix characterize?
- The properties of the matrix and the linear map represented by it (correct)
- The rank of the matrix
- The size of the matrix
- The eigenvalues of the matrix
When is the determinant of a matrix nonzero?
When is the determinant of a matrix nonzero?
- When the matrix has complex eigenvalues
- When the matrix is symmetric
- When the matrix is invertible (correct)
- When the matrix is singular
How is the determinant of a 2 × 2 matrix calculated?
How is the determinant of a 2 × 2 matrix calculated?
- | a + b + c + d |
- | a / d - b / c |
- | a d − b c | (correct)
- | a - b - c d |
Which formula expresses the determinant as a sum of signed products of matrix entries?
Which formula expresses the determinant as a sum of signed products of matrix entries?
How can the determinant of a matrix be computed using row operations?
How can the determinant of a matrix be computed using row operations?
What type of work is done when a force has a component in the direction of the displacement?
What type of work is done when a force has a component in the direction of the displacement?
In which situation does a force do negative work?
In which situation does a force do negative work?
How is work calculated when the force and the angle between the force and displacement are constant?
How is work calculated when the force and the angle between the force and displacement are constant?
What is the nature of work if the force is variable?
What is the nature of work if the force is variable?
What characteristic does work possess as a quantity?
What characteristic does work possess as a quantity?
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Study Notes
Matrix Determinant
- The determinant of a matrix characterizes the scalability and invertibility of a matrix.
- The determinant of a matrix is nonzero if the matrix is invertible and has no linearly dependent rows or columns.
Calculating Determinant of 2 × 2 Matrix
- The determinant of a 2 × 2 matrix is calculated as ad - bc, where a and b are the elements of the first row, and c and d are the elements of the second row.
Determinant Formula
- The determinant is expressed as a sum of signed products of matrix entries, known as the Leibniz formula.
Computing Determinant using Row Operations
- The determinant of a matrix can be computed using row operations, which involve adding multiples of one row to another row, or multiplying a row by a non-zero scalar.
Work and Force
- Positive work is done when a force has a component in the direction of the displacement.
- Negative work is done when a force opposes the displacement, such as when a force is applied in the opposite direction of the displacement.
Calculating Work
- When the force and the angle between the force and displacement are constant, work is calculated as W = Fd cos(θ), where W is the work, F is the force, d is the displacement, and θ is the angle between the force and displacement.
Nature of Work
- If the force is variable, work is calculated as the integral of the force with respect to displacement.
- Work is a scalar quantity, meaning it has only magnitude and no direction.
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