If the angle between two vectors A and B is 60 degrees and |A| = 5, |B| = 10, wh

Practice Questions

Q1
If the angle between two vectors A and B is 60 degrees and |A| = 5, |B| = 10, what is A · B?
  1. 25
  2. 30
  3. 35
  4. 20

Questions & Step-by-Step Solutions

If the angle between two vectors A and B is 60 degrees and |A| = 5, |B| = 10, what is A · B?
  • Step 1: Identify the magnitudes of the vectors A and B. Here, |A| = 5 and |B| = 10.
  • Step 2: Identify the angle between the vectors A and B. The angle is given as 60 degrees.
  • Step 3: Recall the formula for the dot product of two vectors: A · B = |A| * |B| * cos(angle).
  • Step 4: Calculate cos(60°). The cosine of 60 degrees is 0.5.
  • Step 5: Substitute the values into the formula: A · B = 5 * 10 * 0.5.
  • Step 6: Perform the multiplication: 5 * 10 = 50, then 50 * 0.5 = 25.
  • Step 7: Conclude that A · B = 25.
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