If the distance between two masses is tripled, the gravitational force between changes by a factor of

a. 1/9
b. 1/3
c. 3
d. 9

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n

70 give a real life example showing how sensory neurons work with the motor neurons