An experiment was devised to investigate the effects on the temperature of a cup of coffee when cream is added at different time intervals. hot and cold water were used instead of coffee and cream. first, a container of water heated to 80°c was allowed to sit for 15 minutes. its temperature was measured at regular intervals. next, similar temperature measurements were taken for 15 minutes on a new container of heated water, but this time some cold water was added after the 2-minute reading. finally, the procedure was repeated except that for this last test, the cold water was added after the 12-minute reading. the resulting recorded temperatures were plotted on the graph shown here. 1. what question was asked in the experiment? 2. what was the hypothesis, expressed as an if-then statement? 3. what were the independent and dependent variables? 4. what was the control in the experiment? 5. there is one thing that is wrong about this graph. what is it?

Hi Babylilith32,

Your Question:

An experiment was devised to investigate the effects on the temperature of a cup of coffee when cream is added at different time intervals. Hot and cold water were used instead of coffee and cream. First, a container of water heated to 80°C was allowed to sit for 15 minutes. Its temperature was measured at regular intervals. Next, similar temperature measurements were taken for 15 minutes on a new container of heated water, but this time some cold water was added after the 2-minute reading. Finally, the procedure was repeated except that for this last test, the cold water was added after the 12-minute reading. The resulting recorded temperatures were plotted on the graph shown here.  

Answers:

1. If you have cool water then you have to add it to the hot water after a few minutes.

2. The independant variable is the cold water

3. The dependant variable is the temperature

4. The control is the hot water without the cold water.

5. The 2 min cold water drops way to much.

yeet youwelcome broo

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.