Aforce vec f =f x hat i +f y hat j acts on a particle that undergoes a displacement of vec s =s x hat i +s y hat j where f x =7 n , f y =-3 n , s x =4 m , and s y =1 m . find the work done by the force on the particle . answer in units of j.

Lin yao looks at the back of a spoon. how should she describe her reflection? upside down and smaller upside down and larger right-side up and smaller right-side up and larger

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)

Select the correct answer. what does the process of natural selection involve?