The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?

A. 25 g

B. 100 g

C. 75 g

D. 50 g

When an electric current is passed through an insulated wire that is coiled around an iron core, like a nail, what is created?

The correct formula for copper (I) bromide is - Question 4 options: CuBr CuBr2 Cu2Br Cu2Nr3

A 50 kg projectile is fired at an angle of 30 degrees above the horizontal with an initial speed of 1.2 X 10^2 m/s from the top of a cliff 142 m above level ground, where the ground is taken to be y=0.

Who proposed a model with electrons moving in specific layers? a) Dalton b) Thomson c) Rutherford d) Bohr

What is relative density?

How can eclipsing binary stars be identified? They are brighter than any single stars. They are cool red stars. They are all white dwarfs. They become dimmer at regular intervals.

Resistance or opposite to a force refers to a

In tae-kwon-do, a hand is slammed down onto a target at a speed of 10.5 m/s and comes to a stop during the 2.13 ms collision. Assume that during the impact the hand is independent of the arm and has a mass of 0.400 kg.

If you looked at the frequently spectrums of two friends saying the word dog, would they look the same or different ?

Which of the following atoms has the smallest radius? The Periodic Table