Uranium-235=710million The age of Earth was first established in 1953 when Claire C. Patterson of the California Institute of
Technology used a uranium-lead clock to analyze rock. In comparing amounts of uranium-235 with lead-207,
he established that about 8 half-lives of uranium-207 had passed since the rock formed. Using this data,
estimate the age of Earth.
710 m x 8 =

How would doubling the made of an object change the objects potential energy

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.

In this lab you will use a cart and track to explore various aspects of motion. you will measure and record the time it takes the cart to travel certain distances, and then complete some calculations. in the space below, write a scientific question that you will answer by doing this experiment.