Science Part I, Part 2

What is the permittivity of free space ε0?

• the amount of charge on an electron

• a constant related to electric forces in a vacuum

• the force between two charges

• the speed of light

• the strength of the electric field

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If you hold a bucket upside down in the rain so that its opening is parallel to the falling rain, how much rain

enters the bucket?

• a lot of rain

• half as much rain as usual

• none at all

• twice as much rain

• some rain, but less than usual

When calculating the electric flux through the cylinder’s surfaces, which surface(s) contribute to the flux if

the electric field is vertical?

• only the side

• only the bottom

• only the top

• the top and bottom

• all surfaces equally

Which of the following BEST defines the kilogram?

• the force required to accelerate one liter of water at 1 m/s2

• a unit of mass equal to about the mass of one liter of water

• the weight of a typical adult human

• a measure of electrical charge

• the speed of light in a vacuum

An object is acted on by two forces. Force 1 pulls on the object to the right and has a magnitude of 50

Newtons. Force 2 pulls on the object to the left with a magnitude of 30 Newtons.

What is the net force on the object?

• 80 newtons to the right

• 80 newtons to the left

• 20 newtons to the right

• 20 newtons to the left

• zero

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“Static electricity” between two objects occurs because

• they have been electrically grounded

• charges have been rubbed off one object onto the other

• there is an electric current constantly flowing between them

• their magnetic fields exert a force on each other

• electromagnetic radiation passes from one to the other

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What happens when you rub two different materials, like cotton and acrylic, together in a dryer?

• One becomes positive, the other negative.

• Both become positive.

• Both become neutral.

• Both become negatively charged.

• No charge exchange happens.

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Which statement BEST explains why your hairs stand on end after touching the metal sphere of a Van de

Graff generator?

• Gravity pulls the hair upward.

• Air pressure forces the hair apart.

• The strands become negatively charged and repel each other.

• The strands become positively charged and attract each other.

• Heat causes the hair to rise.

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Which of the following allows the excess charge from your body to move when you touch a metal doorknob

after walking on a rug?

• The rug creates a magnetic field.

• The metal provides a path for the charge to leave your body.

• The air insulates the charge.

• Your socks become neutralized.

• The doorknob absorbs heat.

What does the example of hair rising due to static electricity illustrate about electric force?

• It is weaker than gravity.

• It is equal to gravity.

• It is the same strength as magnetic force.

• It is stronger than gravity.

• It only works in a vacuum.

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