Use the data table and information below to answer the following questions. A scientist used a laboratory model to test the effect of radiation, or the sun, in heating land and water on Earth. To do this
experiment, 200 mL of water and dry sand were placed in to 2 separate 250-ml beakers. Each beaker was then placed under
the same lamp. Temperature readings were taken of each substance every 2 minutes for 8 minutes.
Use the data table to answer the following questions.
Starting Temp (°C)
6 min
Substance Heated
Water
Dry Sand
18
2 min
18.5
20
4 min
19.5
22
8 min
22
21
24
18
26
Is this a controlled experiment? Explain.

The temperature would be about 28°C based on the fact that the temperature of the dry sand has increased by 2 degrees during each 2-minute reading.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

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.