Solve and how your solution to his problem: an object of mass 10kg is in a curcular orbit of radius 10m at a velocity of 10m/s a. calculate the centripetal force (in N) required to maintain this orbit.
b. what is the acceleration of this object?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?