What acceleration will a force of 20 newton's cause it applied to a go kart with a mass of 20 kilograma

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

How do you tell if someone actually cares about you? and just say they do?