Question 12 of 15 If the half-life of a decaying isotope is 10 years, which statement
is true after 10 years?
A. The relative numbers of atoms cannot be determined.
B. There are more daughter nuclei than parent nuclei in a sample.
C. There are more parent nuclei than daughter nuclei in a sample.
D. The numbers of parent nuclei and daughter nuclei in a
sample are equal.

A2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. take right to be the positive direction. what is the total momentum of the two balls before they collide? what is the total momentum of the two balls after they collide?

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

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.