If you know that the radius of the Earth is 6.38 X10 m and the value of the constant G is equal to 10-11 6.67 X Nm / kg and the acceleration of gravity m / s2 9.8 then calculate the mass of the Earth?

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.