Sadira makes a graphic organizer to show how geologists and archaeologists use radioisotopes.

which labels belong in the regions marked x and y?
x: uses carbon-14
y: uses uranium-238
x: uses uranium-238
y: determines ages of objects
x: determines ages of objects
y: uses uranium-238
x: uses isotopes with short half-lives
y: determines ages of objects

In a given chemical reaction, the energy of the products is greater than the energy of the reactants. which statement is true for this reaction?

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.