He force of gravity is an inverse square law. this means that, if you double the distance between two large masses, the gravitational force between them a) also doubles. b) strengthens by a factor of 4. c) weakens by a factor of 4. d) weakens by a factor of 2. e) is unaffected.

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

What’s #16 asking and how do i solve it?

In a particular chemical reaction, the energy of the reactants is 30 kj and the energy of the products is 5 kj. 
 the maximum energy of the system is 40 kj. sketch a potential energy diagram for this reaction. make sure to label the energy of the reactants, the energy of the products, the activation energy, and the enthalpy change for the reaction.