is part of the first line of defense against pathogens.

T cells

Skin

Inflammation

B cells

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?