A student was measuring the time it took for an experiment to take place. They found the time to be 40 seconds. However, they had started timing a few seconds after the experiment had started, and the actual time was 43 seconds. What is the percent error?

What three things determine the shape and size of a puddle when water is poured out onto a surface

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a. the mitochondria b. the nucleus c. the vacuoles d. the endoplasmic reticulum