A sample contains 36g of a radioactive isotope. how much radioactive isotope remains in the sample after 3 half-lives

The unit of length that most nearly matches the width of your finger?

A runner hopes to complete the 10,000m run in less than 30,0min, after running at constant speed for exactly 27.0 min, there are still 1100m to go. The runner must then accelerate at 0.

On a frictionless surface, a 32 kg student pushes a 43 kg student. If the 32 kg student slides back at 2.4 m/s, how fast will the 43 kg student be sliding and in what direction?

If a car is traveling eastward, can its acceleration be westward? Explain your answer, and use an example in your explanation.

Magnetic field lines surrounding a magnet are conventionally drawn a. from south to north. b. from north to south. c. either way.

The driver of a car traveling at 32 m/s applies the brakes and undergoes a constant deceleration of 2.25 m/s^2.

You are going to develop some photographic film that involves a chemical reaction between the developer, which you will mix yourself, and a chemical on the surface of the film.

Would time travel mean that parallel universes would be created off our linear time sequence to ensure the universe doesn't collapse itself because of significant events being drastically changed in the way it shapes the universe?

What is the central core of hair

A star with the same mass of the sun has a newly discovered planet whose semi-major axis of 2.48 au and an eccentricity of 0.08. what is the aphelion distance of the new planet