Identify each unit cell as a simple cubic (or primitive-cubic), body-centered cubic, or face-centered cubic unit cell. Face-centered cubic is also known as cubic close‑packed. The first unit cell is a six sided cube with a sphere on each corner and a line along each edge of the cube connecting the center of each sphere with the centers of three other spheres. The second unit cell is a six sided cube with a sphere in the center of the cube, a sphere on each corner, and a line along each edge of the cube connecting the center of each corner sphere with the centers of three other corner spheres. The third unit cell is a six sided cube with a sphere in the center of each face, a sphere on each corner, and a line along each edge of the cube connecting the center of each corner sphere with the centers of three other corner spheres. Dashed lines connect each face sphere with the sphere on the opposite face.

Apulley with a mechanical advantage of 5 will require you to pull times the amount of rope. a. 1/5 b. 5 c. 10 d. 15

While studying chemical reactions and conservation of matter, sarah's class conducted a variety of experiments. sarah and her lab partner found the mass of a wax candle and placed the candle in a flask. the students lit the candle and let it burn to completion. all that was left was wax and charred candle wick. per their teacher's instructions, the students found the mass of the products. their data can be seen in the data table. formulate a hypothesis the students could test to explain why the experiment did not support the law of conservation of matter. a) the students could repeat the experiment using different candles; there might have been a flaw in the candle. b) the experiment should be repeatable. the students should run several trials and then take an average of the after mass in each trial. c) the students should have someone in the class check their measurement skills as they repeat the experiment. they may have made an error using the balance. d) the students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. submit

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final