Extra lesson G10

Which statement is correct?

• the force on X is equal to the force on Y

• the force on X is less than the force on Y

• the pressure on X equals the pressure on Y

• the pressure on X is less than the pressure on Y

On which face must the box rest to exert the least pressure?

• face X

• face Y

• face Z

• the pressure is the same for all the faces

What is the extension of the spring when the load is 400 N?

• 5 cm

• 25 cm

• 40 cm

• 45 cm

What would reduce the depth of the marks for a table of a fixed weight?

• using three legs, each of an area smaller than X

• using four legs, each of an area the same as than X

• using six legs, each of an area smaller than X

• using eight legs, each of an area the same as than X

Look at the figure.

• A

• B

• C

• D

Look at the figure.

• A

• B

• C

• D

What is the input power of the sunlight onto the solar panel?

• 0.16 W

• 4.0 W

• 8.0 W

• 16 W

When a bicycle lamp is switched on, what is the useful energy change within the battery?

• chemical energy to electrical energy

• electrical energy to chemical energy

• electrical energy to light energy

• light energy to chemical energy

Which expression gives the efficiency of the device?

• A

• B

• C

• D

A ball is dropped from rest at the top of building. Air resistance is negligible. The velocity of the ball is 14 m/s when it hits the ground.

What is the height of the building?

• 2.9 m

• 10 m

• 20 m

• 40 m