Why do my hair change colors?

Thorium-229 is the radioactive substance that gives lantern mantels their eerie glow. The half life of thorium-229 is 7340 years. If one mantel consists of 0.25 grams of thorium, how much thorium will remain after 14,680 years? A) 0.0625g B) 0.

Which object has a greater momentum? 1. A 2500 kg truck moving at 0.01 m/s. 2. A 0.1 kg bullet traveling at 300 m/s. 3. They are the same.

If a wave has a speed of 200 m/s and a wavelength of 20 meters, what is the frequency?

If the Velocity of a moving object is doubled what happens to its kinetic energy

Explain why atomic radius decreases as you move to the right across a period for main-group elements but not for transition elements. Match the words in the left column to the appropriate blanks in the sentences on the right.

You measure a watch's hour and minute hands to be 7.4 mm and 12.1 mm long, respectively. Part A In one day, by how much does the distance traveled by the tip of the minute hand exceed the distance traveled by the tip of the hour hand?

Describe the possible long term impact of a catastrophic event

Calculate the mass defect of the helium nucleus 42He. The mass of neutral 42He is given by MHe=4.002603u.

A transparent film laminated to a fabric is identified in the study material as a. stretch fabric. b. PVC. c. a skin. d. two-faced fabric

Technician A says that all friction and steel plates in a clutch pack should be replaced during and overhaul. Technician B says that the automatic transmission fluid cooler should always be flushed when a unit is rebuilt or replaced.