For a photographer that wishes to determine the color of light that he can use in a dark room that will not expose the films he is processing, having used a Blue Incandescent bulb, he should proceed to use a Red Incandescent bulb for the next trial.
The photographer in question is performing an experiment. For these kinds of experiments it is important to identify the variables present, which can be of three kinds:
For this experiment, the dependent variable is the exposure of the light onto the films, given that this is what we wish to measure. The independent variable will be the color of the light being used which is what will affect the dependent variable.
The remaining variable must be the control variable. Unlike the previous variables, we can have more than one of these. The control variable is there to make sure that only the dependent variable is affecting the outcome. We do this by keeping the control variable the same through each trial, which is why the photographer should not change the type of bulb in the second experiment, changing only the color of the light.
To learn more visit:
brainly.com/question/1549017?referrer=searchResults
Answer:
Explanation:
First, the instant associated to the angular displacement is:
Roots of the second-order polynomial are:
Only the first root is physically reasonable.
The angular velocity is obtained by deriving the angular displacement function:
The angular acceleration is obtained by deriving the previous function:
The resultant linear acceleration on the rim of the disk is: