Scientific Method in Real Cases

Scientific Method is widely used for real cases. Some of its application can seem weird for us. Such is the case of investigating the causes for air crashes. However, going over those terrific tragedies has proven essential to help new victims and stop the toll increasing. 
This video may seem tragic for you, but it will help you understand the vital importance of the scientific method for skillfull investigators in order to clarify such crashes. Watch the film and answer these questions:

1. What kind of plane suffers the tragedy?
2. How many people, in total, were travelling inside?
3. When they describe several passengers they focused on two women and a man: Why were they travelling?
4. Why was the flight delayed?
5. How long did it take to the plane to be doomed?
6. Who saw the accident first?
7. Which were the two initial hypothesis to explain the accident?
8. What did they have to study to check this hypothesis?
9. Tell at least two experiments they performed to work out the real cause for the accident?
10. Explain the conclusions of the investigation?
11. Did the investigation lead to any change in planes to help new similar tragedies? Tell examples 

Exercises physics and chemistry 3 and 4 ESO

Do the exercises and send the answer to the teacher with "Formulario de contacto"

1) In an experiment, we determine the density of an object by measuring its mass and its volume. The results are:

Mass (g): 23,7; 23,5;  23,4;  23,6

Volume (cm3): 3,3;  3,2;  3,1;  3,2

Determine with the absolute and the relative eroors, the mean values for the mass and the volume and the final result for the density. Could this material be gold (d=19,6g/cm3)

2) When we measure the duration (T) of a journey against speed (V: km/h), we get these values:

v(km/h)    T(h)

120          2

100          2. 4

80            3 

60            4

40            8

Graph the time(y) against speed. Determine the equation which relates time and speed (time as a function of speed) and the travelled distance. Check your equation is dimensionally rigth