Physics Fall ACP #4

Use Hooke's law to determine which of the following springs is the stiffest?

• A spring that requires a froce of 2000 N to compress it by 6.8 m.

• 
  A spring that requires a force of 8000 N to compress it by 45 m.

• 
  A spring that requires a force of 4800 N to stretch it by 14 m.

• 
  A spring that requires a force of 4000 N to stretch it by 9.0 m.

How can a tennis ball and a bowling ball have the same momentum?

• have the same speed

• one is moving backwards

• have different speeds

• they can't

What is the best description of 'threshold frequency'?

• The minimum energy needed for electrons to escape a surface.

• 
  The minimum frequency of a photon that will cause an electron to be emitted.

• The maximum kinetic energy that an emitted electron has.

• The frequency that an emitted electron will have.

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What statement best explains the behavior of light in the second image?

• A The light is scattered by the second lens, preventing it from passing through.

• The light is absorbed by the second lens because it is polarized at an angle perpendicular to the first lens, preventing it from passing through.

• The light changes wavelength as it passes through the first lens, which is blocked by the second lens.

• The second lens increases the intensity of light, preventing the light from passing through.

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NGSS.MS-PS4-2

The light will appear _____

• red

• orange

• yello

• blue

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NGSS.MS-PS4-2

The observed pitch is

• lower

• higher

• the same

• not enough information to answer

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What would the angle between this light ray and its reflected ray?

• 60 degrees

• 30 degrees

• 120 degrees

• 90 degrees

Which ray best represents the reflected ray?

• A

• B

• C

• D

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NGSS.MS-PS4-2

An x-ray image shows a metal plate used to stabilize a broken arm. Which statement describes how an x-ray image captures the level of detail necessary to see the metal plate in this person’s arm?

• The metal plate is more dense than the bone and muscle, which prevents the x-rays from penetrating and being captured on the other side.

• The x-rays are reflected by the metal plate and bone creating the image seen using the reflection.

• The metal plate and bone absorb the x-rays as the machine captures an image of x-rays concentrated in the body.

• The dense metal plate and bone allow the x-rays to penetrate, and the penetrated x-rays are captured as an image.

Tags

NGSS.MS-PS4-2

When two objects collide, what happens to their momentum?

• 
  their total momentum is smaller

• all of these

• their total momentum is greater

• their total momentum doesn’t change

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NGSS.HS-PS2-2