General physics dr/Shaymaa

• either the measuring cylinder containing water or the balance

• the measuring cylinder containing water only

• the balance only

• neither the measuring cylinder nor the balance

• Both rockets travel the same distance.

• Rocket P accelerates and then decelerates.

• Rocket P travels further than rocket Q.

• Rocket Q has zero acceleration.

• 3.0 m / s

• 5.0 m / s

• 50 m / s

• 60 m / s

What is weight?

• a frictional force

• a magnetic force

• a gravitational force

• an electromagnetic force

• A

• B

• C

• D

6 )A small bottle has a mass of 20 g when empty. The volume of the bottle is 10 cm3 . When full of liquid, the total mass is 150 g. What is the density of the liquid?

• 0.50 g / cm3

• 2.0 g / cm3

• 13 g / cm3

• 15 g / cm3

7 )A rocket is travelling vertically upwards. Three vertical forces act on it. The thrust acts upwards and is equal to 100 000N. The weight acts downwards and is equal to 80 000N. What is the air resistance force acting on the rocket when it is travelling upwards at constant speed?

• 20 000N downwards

• 20 000N upwards

• 180 000N downwards

• 180 000N upwards

X weighs 400 N and sits 1.5 m from the pivot. The weight of the see-saw is 300 N and acts through the pivot. When the see-saw is balanced, the pivot pushes up on the see-saw with a force of 900 N. What is the weight of person Y and how far from the pivot is he sitting?

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