If |a| = 4, what is the magnitude of -3a?
A1
B7
C-12
D12
Answer & Solution
Correct answer: D. 12
Scaling by -3 triples the length and reverses the direction, so the magnitude is 12.
Related questions
In physics, the acceleration of a point is the time derivative of itsWho, with Heaviside, introduced the dot and cross notation for vector products in 1881?In vector analysis the magnetic field B is classed as aA tetrahedron has three mutually perpendicular edges i, j and k from one vertex. Its volumThe vectors i + j and j + k are adjacent sides of a parallelogram. Its area isFor any vector a, the cross product a × a equalsA vector of magnitude 4 is multiplied by the scalar -3. The magnitude of the result isThe direction cosine of i + j + k along the x-axis is