Abird flies 3.6 km due west and then 1.8 km due north. another bird flies 1.8 km due west and 3.6 km due north. what is the angle between the net displacement vectors for the two birds?

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.