A runner weighing 70 kg, moving at a speed of 8.8 m/s, rounds a bend with a radius of 25 m. What is the centripetal force

needed to keep this runner on the curve?

a 250 N

b 100 N

C 217 N

d 158 N

According to the phase diagram for water, how is the state of water determined? proceed up a vertical line at any given temperature read the phase at the intersection of any given temperature and pressure at a given pressure, proceed horizontally to the s-l or l-g line

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law

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? ?