A uranium-235 sample starts with 200 atoms, and 700 million years later, there are 100 atoms. What is the half-life of uranium-235?

A. 350 million years

B. 235 years

C. 100 years

D. 700 million years

How is the grouping of states in a constellation different from the grouping of planets in the solar system?

Three identical metallic conducting spheres carry the following charges: q = + 3.8 μC, q = - 2.6 μC, and q = - 8.8 μC. The spheres that carry the charges q and q are brought into contact. Then they are separated.

Which wave causes the medium to vibrate only in a direction parallel to the wave's motion? A. a transverse wave B. a surface wave C. a longitudinal wave D. none of the above

Which is larger a food web or a food chain

An example of a force that acts on a car

Compare and contrast between reflection and refraction

You push a friend sitting on a swing she has a mass of 50 kg and accelerates a rate of 4 m/s2 find the force you exerted

What must be true about tow objects if heat is flowing between them?

Will a 2 liter bottle of coke have a different density than a one liter bottle of coke?

A positive rod is placed to the left of sphere A, and the spheres are separated