8. the velocity of a car reduces from 30 km/h to 5 km/h as the car approaches a stop sign. is this an example of positive or negative acceleration? (circle the correct answer)

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Which of the following statements are evidence that gases do not always behave ideally? check all that apply.? a. co2 gas becomes dry ice (solid co2) at 1 atm and –78.5 °c. b. when two gases are mixed, they follow dalton\'s law of partial pressures. c. at 4 k and 1 atm, helium is a liquid. d. it is impossible to compress a gas enough so that it takes up no volume.