What are the units of the fitting parameters m and b? Does the measured gravitat

Question

What are the units of the fitting parameters m and b? Does the measured gravitational acceleration g(exp) in Tables 1 and 2 depend on the falling distance h, the size and mass of the object in this experiment? Why? A coin is dropped from your hand 2.0 m above the floor. In how many seconds will it reach the floor? What is the velocity of the coin just before it strikes the floor? Free fall in a vacuum: a steel ball and a pith ball with the same diameter are loaded into the top of a large drop tube, which is evacuated to create a very low-pressure environment. The two are released simultaneously from the same level to fall to the bottom of the tube. Which one of the following statements true? Steel ball reaches the bottom first. Why? Pith ball reaches the bottom first. Why? Two balls reach the bottom simultaneously. Why?

Explanation / Answer

3) a) initial speed of the coin is Vo = 0 m/sec

distance travelled is S = 2 m

then using

S = (Vo*t)+(0.5*g*t^2)

2 = (0*t)+(0.5*9.8*t^2)

t = 0.64 sec

b) V^2 - Vo^2 = 2*g*S

V^2 - 0^2 = 2*9.8*2

V = 6.26 m/sec

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