Potassium-40 has a half-life of 1.3 billion years. As the potassium-40 isotope decays, it becomes argon. If a rock was formed with 12 g of potassium-40, approximately how long would it take for 75% of the potassium-40 to be replaced by argon?

What is the magnitude of the momentum of a 0.50 kg ball moving in a straight line at 5.0 m/s? A. 0.1 kg • m/s B. 2.5 kg • m/s C. 6.3 kg • m/s D. 10 kg • m/s

Why is thermal energy from the Sun transferred to Earth through electromagnetic waves instead of any other type of thermal energy transfer? Electromagnetic waves can carry energy through matter. Electromagnetic waves can travel through empty space.

How has scientific experimentation affected the model of an atom? The atomic model has become more accurate because of this experimentation. The atomic model has become a less accurate representation of the actual atom.

Who do I say you in French.

The material at the center of the sun is in what physical state? a. solid b. liquid c. gas d. plasma

An exploration submarine should be able to descend 1200 m down in the ocean. If the ocean density is 1020 kg/m3, what is the maximum pressure on the submarine hull?

Why cooking pans don't have have metal handles?

Why will marchers at the end of a long parade following a band be out of step with marchers nearer the band

How would you explain photosynthesis to a new student in class

If the abosolute of a gas is 600 k, the temperature in degrees Celsius is