The power rating of a vacuum cleaner is 0.8 kilowatts. if you use the vacuum cleaner for 2.5 hours, how much energy does it use?

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)