What special precaution must be taken in the method for Part 1 when the weight is dropped onto the moving trolley and why? What is the mistaken tendency, that often occurs when someone does this measurement for the first time?

Abullet found at a crime scene may be used as evidence in a trial if the percentage of metals match to the composition of metals in a bullet from the suspect's ammunition. a forensic scientist's analysis of the bullet shows that it contains 11.9 g of lead, 0.5 g of tin, and 0.8 b of antimony. what is the percentage of lead metal in the bullet? express your answers to the one's place.

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?