Do you calculate vectors

1. Is cosine theorem C = a + B - 2abcosc. Triangle rule, absolutely satisfy

2. Answer: D analysis: to see whether a quantity is a vector is to see whether it has two elements of a vector: size and direction. Because ②, ③ and ④ are quantities with both size and direction, they are vectors; However, ①, ⑤, ⑥ and ⑦ have only size but no direction, so they are not vectors

4. Vector: a quantity with both size and direction
there are three elements of force, namely the size, direction and action point of force< So force is vector!

5. BA*F=(-6,-3,-3)

6. Scalar has size but no direction (only positive and negative)
vector has size and direction
force is vector, because force has both size and direction

vector refers to physical quantities with both size and direction, such as force, displacement, velocity, impulse, momentum, etc

scalar is a physical quantity with only size and no direction. Such as: quality

7. The building owner needs to see more basic knowledge of physics. The action of force includes two aspects: size and direction. It's a vector
displacement and distance are relative. For example, in the case of a to B, the straight line is the displacement and the curve is the distance. It's easy to understand.

8. Scalar
has size
has no direction (only positive and negative)
vector
has size
has direction
force is vector, because force has both size and direction
vector refers to physical quantities with both size and direction, such as force, displacement, velocity, impulse, momentum, etc
scalar is a physical quantity with only size and no direction. Such as: quality

9. Acceleration
angular velocity
field strength
magnetic inction
correct the following answer: vector has size and direction, but not the quantity with size and direction is vector.
for example & quot; Your father has a beard, but it's not necessarily your father who has a beard; It is the same.
the quantity satisfying parallelogram rule should be vector