A 600 kg roller coaster car is sitting at the top of the ride's first hill, 90 m from the ground. What is the car's potential energy?

Why is carbon ideal for making different compounds?

What is the effect of returning nuclear reactor cooling water back into bodies of water?

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt