Most scientists believe that perpetual motion devices can never be invented, but people come up with new ideas for them all the time. Do you think people should keep trying? Why?

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)

Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place? from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma