In an experiment on the transport of nutrients in the root structure of a plant, two radioactive nuclides x and y are used. initially 2.20 times more nuclei of type x are present than of type y. just three days later there are 4.55 times more nuclei of type x than of type y. isotope y has a half-life of 1.60 d. what is the half-life of isotope x?

What is the angular momentum of the bar about the axle?

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy. work depends on the square of the change in potential energy. work is equal to the negative of the change in kinetic energy. work is equal to the square of the change in kinetic energy