Two samples of aluminum foil, 27 grams and 54 grams, are cut out from a roll. Which of the following properties is different for the two? A. Amount of matter
B. Color
C. Density
D. Electrical conductivity

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?