6. for the following graph what can you conclude about the force applied to cause the object’s motion? explain your reasoning
7. graph the information on the following data table and then explain what the slope represents. these data represents the time it takes to hear a thunder after a lighting strikes.

Explanation:

6) I can't read graph A, but I will assume it is similar to graph B. The graph represents the position of an object with respect to time. The slope of this graph represents the velocity of the object. Since the graph is a straight line, the slope of the graph is constant and also the velocity of the object is constant. If the velocity is not changing the force on the object must be zero.

7) I can't see the data table but I will assume it is similar to example (6). In that case, the slope of the graph would represent the speed of the sound.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.