Draw the free-body diagram of a bridge when a person is standing on it using the box below. How would the free body diagram change if there was snow on the bridge as well? Draw this with the other box.

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.