Final answer:
True - The Pythagorean theorem can be used to calculate the length of the resultant vector obtained from the addition of two vectors at right angles.
Step-by-step explanation:
True or False: We can use the Pythagorean theorem to calculate the length of the resultant vector obtained from the addition of two vectors which are at right angles to each other.
Answer: True
When two vectors are at right angles to each other, their magnitudes can be calculated using the Pythagorean theorem. In this case, the resultant vector can be seen as the hypotenuse of a right triangle formed by the two vectors. The Pythagorean theorem states that the square of the hypotenuse is equal to the sum of the squares of the other two sides. Therefore, we can use the Pythagorean theorem to calculate the length of the resultant vector obtained from the addition of two vectors which are at right angles to each other.