27. A bicycle wheel on a repair bench can be accelerated either by pulling on the chain that
is on the gear or by pulling on a string wrapped
around the tire. The tire's radius is 0.38 m, while
the radius of the gear is 0.14 m. What force would
you need to pull on the string to produce the
same acceleration you obtained with a force of
15 N on the chain?

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

When using the scientist method, which step comes last?

Use vsepr theory to predict the molecular geometry of the molecule hcn.