Glenn is heating water in a teakettle. The hotter water at the bottom of the kettle rises. The cooler water near the top sinks and warms. Which kind of transfer of heat is this?

A. conduction

B. convection

c. radiation

d. transmission

If a machine has an efficiency of 50 percent and an MA of 3, what is its IMA?

A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 12.0 cm, giving it a charge of - 49.0 mC. Find the electric field (a) just inside the paint layer; (b) just outside the paint layer; (c) 5.

According to the simple de Broglie model, how many wavelengths are there in an electron wave in the first orbit? In the second orbit? In the nth orbit?

You are asked to write an article for the school newspaper about fad diets. Which of the following paragraphs would be the most factual? A. Fad diets are extreme and do not include balanced meals.

Which of the following is the same in all frames of reference? A. Length of an object B. Speed of light C. Mass of an object D. Rate of time passage

What organelle is found in all animal cells and some plant cells

Basic of Archimedes's principle of how fluid can make body to float and sink.

A bullet is accelerated down the barrel of a gun by hot gases produced in the combustion of gun powder. What is the average force (in N) exerted on a 0.0500 kg bullet to accelerate it to a speed of 625 m/s in a time of 1.10 ms (milliseconds)

Your boss at the Cut-Rate Cuckoo Clock Company wants to save money on materials. You are asked to reduce the balance wheel, which is cylindrical, dimensions to one-third their original values.

Which of the following conditions is not necessary to observe an interference pattern between two sets of waves? A) The waves must have the same wavelength. B) The waves must have a constant phase difference.