Science Help Please?

28. Inside all vacuum cleaners is a high-speed fan. Explain how this fan causes dirt to be picked up by the vacuum cleaner.



1. Which of the following assumptions is NOT part of the kinetic theory?

a. all matter is made up of tiny, invisible particles

b. the particles are always moving

c. particles move faster at higher temperatures

d. particles are smaller at lower pressure



3.Durring which change of state does atoms or molecules become more ordered?

a. boiling

b. condensation

c. melting

d. sublimation



4. Which of the following describes what happens as the temperature of a gas balloon increases?



a. the speed of the particles decreases

b. the volume of the gas increases and the speed of the particles increases.

c. the volume decreases

d. the pressure decreases



5. Fluid pressure is always directed

a. up

b. down

c. sideways

d. in all directions



6. Materials that can flow to fit their containers include

a. gases

b. liquids

c. both a and b

d. none of the above



7. If an object weighing 50 N displaces a volume of water w/ a weight of 10N, what is the buoyant force on the object?

a. 60 N

b. 50 N

c. 40 N

d. 10 NScience Help Please?
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