Slader By measurement, the electric field in a certain region of the Earth’s atmosphere is found to be vertically downward. At a height of 300m above the surface the electric field is 60 N/C. At a height of 200m the electric field is 100N/C. (a) Using Gauss’s Law find the amount of electric charge contained in a cube with an edge size of 100m. (b) Calculate the area of the Earth at its surface, assuming it is a uniform sphere. (c) If the field is 300 N/C near the Earth’s surface, use Gauss’s Law to calculate the total electric charge on the Earth, assuming the electric field is radially downward and constant in magnitude over the whole surface of the Earth.

How much force was applied to an object if was moved 2 meters and the work done on the object was 8 joules? a. 0.25 n b. 4 n c. 6 n d. 16 n

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

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.