Answer:
D. Test a piece of treated iron and a piece of untreated iron under the same conditions.
Explanation:
A controlled experiment is defined as an experiment where the experimenter or the researcher tries to test or experiment his result by changing one variable at a time and keeping the other factors under the same conditions and sees how it effects the result.
The factors which can be changed in an experiment is called its variables.
In the context, testing a piece of treated iron as well as a untreated piece of iron under the same working conditions forms a controlled experiment.
Answer:
we approach a maximum or minimum the values of the ordinate are closer and closer and when passing this point the values change their trend
Explanation:
The reason for this process occurs because as we approach a maximum or minimum the values of the ordinate are closer and closer and when passing this point the values change their trend if they were rising, they begin to fall and if they were falling they begin to rise. Therefore the maximum point is a point of inflection of the curve since its trend changes.
Another way of looking at this process is that mathematically the point where there is a maximum or a minimum corresponds to the point where the first derivative is equal to zero, this is the slope of the line is horizontal, so the points before after correspond to values with slope of different sign.
Answer:
Revisar las respuestas a cada problema, como se muestra mas adelante.
Explanation:
Para poder solucionar esta serie de problemas debemos de utilizar la segunda ley de Newton, la cual nos dice que la sumatoria de fuerzas sobre un cuerpo debe de ser igual producto de la masa por la aceleracion.
De esta manera tenemos:
ΣF = m*a
donde:
F = fuerza [N]
m = masa [kg]
a = aceleracion [m/s^2]
1 )
F = m*a
60 = m*4
m = 15[kg]
2)
F = m*a
a = 250/50
a = 5 [m/s^2]
3)
F = m*a
F = 80*2.5
F = 200 [N]
4)
F = m*a
800 = 1500*a
a = 0.533[m/s^2]
5)
F = m*a
100 = 500*a
a = 100/500
a = 0.2 [m/s^2]
Answer:
The power of the mirror is -17.24 diopter.
Explanation:
Magnification of an image,m = 
Distance of the object from the mirror = u = 29.0 cm
Distance of an image from the mirror = v
Magnification = 
Focal length of mirror = -5.8 cm =-0.058 m
Power of the lens = P
I think it is D- diluting a solution sorry if i am wrong
