8.2

Which part of the ear is a tube that looks like a snail and it changes sound into nerve impulses that are sent to the brain?

• pinna

• anvil

• cochlea

Where does HEARING (interpreting the nerve impulses) take place?

• outer ear

• middle ear

• inner ear

• brain

Tags

NGSS.MS-LS1-8

What is the anticlockwise moment acting on this crane?

• 80,000Nm

• 100,000Nm

• 120,000Nm

• 140,000Nm

Tags

NGSS.MS-PS2-4

A seesaw is unbalanced with two people of different masses sitting equal distances from the center. Which of the following will result in equilibrium?

• The larger person moving further away from the center.

• Moving the smaller person closer to the center.

• Moving the smaller person further from the center.

• Making the larger person do nothing.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

• 450 N

• 350 N

• 4.5 N

• 200 N

Tags

NGSS.MS-PS2-2

A _________is a simple machine with a fulcrum and a rigid bar.

• Pivot

• Lever

• Wedge

Assuming the system is in equilibrium, calculate the missing distance d

• 3.4 m

• 2.8 m

• 4.4 m

• 1.6 m

Which type of lever is this?

• First Class Lever

• Second Class Lever

• Third Class Lever

6. What kind of lever is this?

• First Class Lever

• Second Class Lever

• Third Class Lever

A see saw is an example of a:

• 1st class lever

• 2nd class lever

• 3rd class lever