Assume the earth's mass is 31.589 x 1025 kg, and radius is 60.9 x 103 miles, what would be the gravitational acceleration on such an planet in unit of m/s2? Use G=6.67x 10 -11 Nm2/kg2.

we need to know the time interval during which the force acts. impulse of force = momentum change

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

prndulum needs thread, weight clock to time swings