Why does the number of elements vary from period to period

As a spherical ammonia vapor bubble rises in liquid ammonia, its diameter changes from 1 cm to 3 cm. Calculate the amount of work produced by this bubble, in kJ, if the surface tension of ammonia is 0.07 N/m.

What is technology? O A. the ability to perform a task in a short period of time using little to no energy OB. the ability to perform a task using a full range of motion in a short period of time OC.

If an alveolus with an initial volume of 3 ml of air with a total pressure of 810 mmhg decreases in volume to 1.7 ml, what would the new pressure be and in which direction would air flow? assume you are at sea level.

Example 1: A length of wire is cut into five equal pieces. The five pieces are then connected in parallel with the resulting resistance being 2.009. What was the resistance of the original length of wire before it was cut up?

What will tightening the strings on a violin do? increase the pitch decrease the pitch have no effect on pitch

Which of the following is the most accurate statement concerning the properties of matter? a. they can be written as symbols b. they can be observed and measured c. they cannot be tested or verified d. they change with the amount of matter present

Danilo is sliding down a slide. What forces are acting on him as he slides

If you want your investment or savings account to be easily turned into cash without losing its value, you should consider the?

What is the definition of "gravitational potential energy"?

A number of food chains linked together