The Lesson Essay

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PHYSICS REVISION WORKSHEET – Density & Pressure Name : ________________________ Class: Form 3 _________ Max Mark 55 1. Clive is investigating the density of 3 liquids: Oil, Orange Juice and Lemonade. (a) Describe how Clive can find the Mass of a liquid. (2) (b) Clive obtains the following results: Liquid Orange Juice Oil Lemonade Mass 1200g 1140g Volume 1000cm3 1200cm3 Density 1.1g/cm3 0.9g/cm3 5. A large dictionary measures 25cm x 18cm and is 6cm thick. If its mass is 1.1kg, calculate the pressure exerted by the book when placed: (a) Upright. (3) (b) Flat on its cover. (3) 6. Explain, in terms of area and pressure, the following situations: (a) A butcher whets (isinn) his knife before cutting meat. (2) (b) A soft sofa is more comfortable than a wooden bench. (2) (c) BBQ Kebab sticks are pointed. (2) (d) Scissors for children have rounded tips. (2) 7. A bank has pressure sensitive tiles near its safe. When activated, an alarm sounds if the pressure exceeds 650Pa, which is the pressure exerted on the ground by a typical cat. A robber thinks that he could design shoes large enough to permit him to walk on these tiles without triggering the alarm. If his mass is 55kg, calculate the area his shoes must occupy. From your result explain why his idea not so brilliant after all. (4) 8. Write down the formula used to work out the pressure exerted by fluids. (2) 9. Name two properties of pressure in fluids. (2) 10.Diesel fuel is stored in large tanks. If one such tank is 15m high, what is the pressure exerted by the diesel, of density 850kg/m3, on the bottom of the tank. (3) Clive left out some information. Work out the missing values. (6) (c) Clive has an ice cube of sides 2cm. If its mass is 7.36g: (i) Work out the ice cube’s density. (3) (ii) State on which of the liquids should the icecube float/sink. Explain. (3) 2. Nathan Drake, the famous treasure hunter, has a

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