Using the periodic table, explain the difference between hydrogen, deuterium, and tritium-I. e. hydrogen-1 and hydrogen-3

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

What is a subatomic particle with a negative charge and very little mass?

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm