A student does an experiment with a plastic bottle. He tips the bottle through different angles and measures the angle at which it topples over Then he adds water to the bottle and measures the angle again . a Here are the results of his experiment . Plot the results on the graph paper . 60 70 60 Angle f^ ) 60 50 50 .40 Volume water (cm^ 3 ) 250 500 750 1000 1250 1500 1750 2000 30 30 20 10 20 15 10 10 0 5001000 1500 volume of water (m ^ 3) 2000 2500 Write a conclusion for this experiment . Include these words in your conclusion : stable centre of mass

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

Earth has a mass of 5.97 x 1024kg, and a mean radius of 6.38 x 106m. what would be the orbital speed and period of a satellite in orbit 1.44 x 108 m above earth?