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

What was Issac Newton's contribution to our understanding of the fundamental forces of the universe? (Gravity, electromagnetic, strong force, weak force)

How many pounds must a sandbag weigh to test if a safety net can absorb the proper amount of force

Acceleraion - - - rae o change in velociy, which is he change in velociy divided by he change in ime or a. True b. False

As a new electrical technician, you are designing a large solenoid to produce a uniform 0.160 {/rm T} magnetic field near the center of the solenoid. You have enough wire for 4200 circular turns. This solenoid must have a length of 1.

Gravity on the moon is about 1/6 th the gravity felt on the earth. This is because A) the moon is so far away from the earth. B) the moon is much less massive than the earth. C) the earth has a molten core and the moon doesn't.

The density of ice is 0.93 g/cm3. what is the volume, in cm3, of a block of ice whose mass is 5.00 kg? remember to select an answer with the correct number of significant figures.

Two planets p1 and p2 orbit around a star s in circular orbits with speeds v1 = 44.0 km/s, and v2 = 56.2 km/s respectively. (a) if the period of the first planet p1 is 700 years what is the mass, in kg, of the star it orbits around? kg

The theory describing the movement of the plates is called plate motion theory. True or false?

Would electromagnetic waves exist if changing magnetic fields could produce electric fields but changing electric fields could not, in turn, produce magnetic fields? Explain.

A person walks 4.0 kilometers north, then 4.0 kilometers west. His displacement is closest to