Please help guys i need it 350 cc of certain gas was found at weigh 1 kg at STP what is the weight of the gas​

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error

Who was the first scientist to measure speed as distance over time?