Chapter 2, Problem 2.10E

In the Millikan oil-drop experiment (see Figure 2.5), the tinyoil drops are observed through the viewing lens as rising,stationary, or falling, as shown here. (a) What causes theirrate of fall to vary from their rate in the absence of an electricfield? (b) Why do some drops move upward? [Section 2.2] The following exercises are divided into sections that dealwith specific topics in the chapter. The exercises are groupedin pairs, with the answers given in the back of the book tothe odd-numbered exercises, as indicated by the red exercisenumbers. Those exercises whose numbers appear in bracketsare more challenging than the nonbracketed exercises.

1) In Raiders of the Lost Ark, Indiana Jones tried to remove a gold idol from a booby-trapped pedestal.  He replaces the idol with a bag of sand.  If the idol has a mass of 2.00 kg, how many litres of sand must he place on the pedestal to keep the mass sensitive booby-trap from activating? (Density of sand is 3.00 g/cm3)

1. Marie Curie was a Polish scientist that specialized in chemistry and physics. She wanted to understand how X-rays worked and noticed in her studies that the element, Uranium, gave off rays that could be measured but did not know what the rays were. She assumed that the rays came from the uranium itself instead of through different molecules interacting with each other. To study the rays, she used an instrument, called an electrometer, that studied the electricity that the rays passed through the air. Through this she was able to discover that the more uranium atoms there were in a compound, the stronger the rays that came off of it. She used this discovery to test other minerals that emitted more rays than Uranium, and discovered the elements Thorium, Polonium and Radium. Through her discoveries of these elements, scientists were able to find the structure of the atom and even how the rays can be used to fight cancer. What was Marie Curie’s observation? 2. What was Marie Curie's…