3D - WA 2 Revision

The pressure of methane gas is measured as shown. The other end of the manometer is exposed to atmosphere.

Select the correct statement(s).

• pressure of methane gas is lower than atmospheric pressure

• pressure of methane gas is higher than atmospheric pressure

• pressure of methane gas is equal to 20 cmHg

• pressure of methane gas is 20 cmHg more than atmospheric pressure

The diagram shows a barometer.

Which length represents atmospheric pressure?

• A

• B

• C

• D

Select the statement(s) true of the hydraulic press.

• Fx < Fy

• Fx > Fy

• Ax/Ay = Fx/Fy

• Ax/Ay = Fy/Fx

A thumb tack is held as shown.

Which statement is correct?

• force at finger > force at thumb

• force at finger < force at thumb

• pressure at finger > pressure at thumb

• pressure at finger < pressure at thumb

A cube of mass m is placed in three liquids as shown.

Which statement is correct.

• liquid A is densest

• liquid A is denser than liquid B

• liquid C is densest

• liquid C is less dense than A

Where is the centre of gravity of the toy located?

• At the point of contact

• Above the point of contact

• Below the point of contact

A force of 20 N is applies on a plank pivoted at P.

What is the perpendicular distance of the force from P?

• 8 Sin 30 m

• 8 m

• 8 cos 30 m

• 8 tan 30 m

A 2 m pole of 100 N is pivoted at A and B by strings.

Calculate the tension in the string at A in Newtons.

(indicate ans to nearest whole number, without units)

A body experiences no net force.

Which statement(s) about its motion is/are correct?

• at rest

• accelerating

• at constant velocity

• decelerating

A man stands on a ladder. The ladder is placed against a rough wall and rest on a rough floor.

Indicate forces acting on the ladder.