If vec A and vec B are vectors and vec B = -vec A , which of the following is true ? a) The magnitude of is equal to the negative of the vec B magnitude of vec A

b) Ā and vec B are perpendicular .

c) The direction angle of is equal to the direction angle of vec B A plus 180 degrees

d ) vec A + vec B =2 vec A .

To run the physics cart, the fan speed of the cart is manipulated. this is the (blank) variable. the cart accelerates due to the speed of the fan. acceleration is therefore the (blank) variable. a “constant” is a parameter that stays the same regardless of the variables. one parameter of the cart that is held constant is the (blank) .

Which articulations allow for greatest range of motion?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.