A student compared two samples of matter. He recorded the results in this chart.
Sample A
Sample B
Appearance: shiny and yellow Appearance: dull and yellow
Mass: 8 g
Mass: 8g
Density: 19.3 g/cm3
Density: 2.0 g/cm3
Good conductor of electricity Poor conductor of electricity
Melting point: 1064°C Melting point: 115°C
Which property do the two samples have in common?
A. Melting point
B. Volume
C. Color
D. Electrical conductivity

First, launch the video below. you will be asked to use your knowledge of physics to predict the outcome of an experiment. then, close the video window and answer the question at right. you can watch the video again at any point. part a as in the video, we apply a charge +q to the half-shell that carries the electroscope. this time, we also apply a charge –q to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? view available hint(s) as in the video, we apply a charge + to the half-shell that carries the electroscope. this time, we also apply a charge – to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? it deflects more than it did at the end of the video. it deflects the same amount as at end of the video. it does not deflect at all. it deflects less than it did at the end of the video. submit

What effects result when there is an impact between earth and an asteroid? check all that apply. a. massive flooding. b. extinction of many life forms. c.major earthquakes change in average global temperature. d. giant dust cloud

What equation is used to calculate the weight of an object on a plant ?