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

Does the universe ever stop?

the highest-caliber cannon ever built (though never used) is located in Moscow Russia. The diameter of the cannon's bar is about 82 cm, and the cannon's mass is 35027 kg. Suppose the cannon were lifted by airplane.

Newton's first law of motion is also known as the law of a. inertia b. radiation c. attraction d. perpetual montion

If 25 mL of each of the liquids in the answer choices below were poured into a 100 mL beaker, which would form the top layer? A. sea water - density of 1.024 g/mL B. mineral oil - density of 0.910 g/mL C. distilled water - density of 1.0 g/mL D.

On a distance vs. time graph of an object's motion, distance is usually

A sound wave traveling at STP has a period of. 0023 seconds. The wavelength of this sound is closest to 1) 1.4E5 2) 6.9E-6 3) 0.76m 4) 76m

Static charge develops on a substance as it acquires or loses protons due to friction. a. True b. False

A milk truck carries milk with density 64.6 lb/ft3 in a horizontal cylindrical tank with diameter 12 ft. (a) Find the force exerted by the milk on one end of the tank when the tank is full. (Round your answer to the nearest integer.) lb

Which human activity contributes to air pollution

Cooler stars age much faster than hotter stars true or false