Why is net force a vector sum a. all forces have direction and magnitude b. forces can only be attractive c. all forces are contact forces d. there are four fundamental forces

What happens to the light rays when they hit the specimen?

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

In a set amount of time, a battery supplies 25j of energy to an electric circuit that includes two different loads. one of the loads produces 10 j of heat energy during this time interval. how much heat energy is produced by the second load in this time? explain your answer