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

Which material is likely to slow the flow of electric charges the most? explain.

What is the thickness of the mantle in km?

Definition and explanation of conduction convection and radiation in your own words

What was Pangaea? When did it form and when did it break apart? It was A) a large ocean basin that opened in the Triassic and closed in the Paleocene B) the supercontinent that formed in the late Paleozoic and broke apart in Mesozoic C) the huge

Which planet is small, with a rocky surface and an atmosphere? Jupiter Neptune Uranus Venus

Juan is interested in finding out whether hummingbirds are attracted to some flowers more than others. In what order should Juan perform the steps of his experiment?

Will make Brainlest! <3 Metals are considered to be good conductors of heat. How do the specific heat values indicate this?

Which example identifies a change in motion that produces acceleration? choices are: 1. a speed skater moving at a constant speed on a straight track 2. a ball moving at a constant speed around a circular track 3.

Which of the following diagnostic procedures uses ultrasound?

Why is it easier to read black text on a white background than to read green text of any light color?