A radioactive isotope of the element potassium decays to produce argon. If the ratio of argon to potassium is found to be 31:1, how many half-lives have occurred?

Is a soild has a mass of 180 g. what is the density of the soild

You are on a boat which is crossing the prime meridian. the altitude of polaris is 50º. explain how you know the boat's location is 50º north latitude and 0º longitude.

The force applied to a moving object was 100 N. The object moved 5 m. How much work was done on the object?

How much total energy is dissipated in 10. seconds in a 4.0-ohm resistor with a current of 0.50 ampere? (1) 2.5 J (3) 10. J (2) 5.0 J (4) 20. J

Which best describes the surface of a concave mirror?

How many poles does Jupiter's magnetosphere have? a. 2 c. 8 b. 4 d. 9

Which describes nuclear fusion? The nuclei of two atoms combine to form a larger nucleus. The nucleus of one atom splits to form two smaller nuclei. The electrons of two atoms combine to form a cluster of electrons.

In a class debate, a student argues that the big bang theory is "just a theory." What is most likely to be this student's understanding of scientific theories? A. Theories agree with observations of nature. B. Theories are just guesses. C.

Look at the advertisement. A poster that reads, "There's more to resistors than resistance. If you're really serious about cost, be serious about quality." with tools. Which persuasive media technique is used in this advertisement

If you were told an atom was an ion, you would know the atom must have a