A 500. gram sample of nickle-63 has a half-life of 100. years and has decayed for 500. years. How much of the original 500. gram sample remains?

87.1 grams

574 grams

16,000 grams

15.6 grams

Why is the gravitational potential energy of an object 1 meter

A boat takes 4.0 h to travel 36 km down a river, then 5.0 h to return. how fast is the river flowing

What type of radiation exposure of 100,000 mrem can cause radiation sickness or increase the risk of cancer? Long term exposure Short term exposure Both long and short term exposure

Each of the two wires in a particular 16-gauge extension cord has an electric resistance of 0.0200 Ω. You're using this extension cord to operate a toaster oven, so a current of 11.0 A is flowing through it.

How much electrical energy is used by a 350 W television that is operating for 25 minutes? O A. 21,000 J O B. 650,000 u C. 8750 J O D. 525,000

The basic building block of life is

What is the reason for Mary's resemblance to her mother. Mary's relatives and friends feel she had her mothers feature

Is a balance scale used to describe how much matter is in an object

At distances greater than 2 femtometers, the nuclear strong force is stronger than (select all that apply): gravity electromagnetic forces nuclear weak force none of the above

Identifying the Functions of Parts of the Ear Which part of the ear changes sound to a signal that the brain can understand? Which part of the ear carries the signal to the brain?