Modul Homework Week 5 & 6

SCHOOL HOLIDAY HOMEWORK (WEEK 5 & 6)

Question 1 [force and pressure]

Diagram 1.2 shows a hydraulic jack in a car service centre.

(a) A force of 50 N is exerted on the small piston when the handle is pushed down. The cross sectional area of the small areas of the piston and the large piston are 0.04 m2 and 0.8m2 respectively.

(i) Calculate the pressure exerted on the oil in the hydraulic jack.(ii) Calculate the force that the oil exerts on the large piston.

Question 2 [force and pressure]

Diagram 2 shows a block which measures 5 cm X 5 cm X 2 cm and has a mass of 500 g is fully immersed in water that has a density of 1 000 kg m-3. Before the block is immersed, the reading on the balance shows 6N.

Physics/ Problem solving (Quantitative)

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Diagram 1.2

Diagram 2

(a) What is the weight of the block when it is fully immersed in the water?(b) (i) What is the buoyant force produced when the block is fully immersed in water?

(iii) What is the tension of the rope, T, when the block is fully immersed in the water?(iv) What is the reading shown on the balance when the block is fully immersed

in the water?

Question 3

Diagram 3.1 and diagram 3.2 show two identical mirrors which are hung on the wall using strings, of the same length.

(a) Draw the scale drawings of the triangles of forces to determine the values of T1 and T2.

Question 4

A solid substance, of mass 0.05 kg, is heated using an immersion heater of 240 V, 0.1 kW. Diagram 6 shows the heating curve of the solid.

(a) (i) Calculate the specific latent heat of fusion of the substance(ii) Calculate specific heat capacity of the substance in liquid state

Physics/ Problem solving (Quantitative)

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Diagram 3.1 Diagram 3.2

Diagram 5

Question 5

Diagram 5.1 and 5.2 show a ray of light passing into glass and diamond respectively.[Refractive index: Glass = 1.50 ; Diamond = 2.42]

(i) Calculate the critical angle of diamond and glass

Question 6

Diagram 16 shows a wooden sampan of mass 200 kg with a volume of 2 m3 floating in the sea. Determine the value of F

Question 7

A tanker of mass 1 800 kg accelerates from rest to a velocity of 45 km h-1 in 10 s. (i) Calculate the acceleration of the tanker.(ii) Calculate the force acting on the tanker

Physics/ Problem solving (Quantitative)

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Diagram 6

Diagram 5.2Diagram 5.1

Question 8

The mass of water is 0.5 kg and the specific heat capacity of water is 4200 J kg-1 C-1. The initial temperature of the water is 30 oC.

(i) Calculate the energy absorbed by the water to reach its boiling point.(ii) When the water is boiling, the reading of the compression balance by 0.0125 kg in

60 s. Calculate the specific latent heat of vaporization of the water.

Question 9

A crane P is used to lift 250 kg of iron scrap to a height of 4 m in 5 s. Determine output power of the crane.

Question 10

(a) A piece of fin in the engine of a motorcycle with a mass of 0.5 kg made from metal R. If the temperature increased by 10 oC in one hour, how much of energy being absorbed by the fin.

(b) If 10 fins identical to the one in (a) are used in the motorcycle engine, how much energy is lost by the engine in one hour?

Question 11

If the volume of a boat that sinks in the sea is 250 m3 and the density of sea water is 1080 kg m-3. Calculate

(i) upthrust which acts on the boat(ii) the volume of water displaced when the boat is in the river

[ Density of river water = 1 000 kg m-3]

Question 12

Calculate the real depth of a fish in a pond if the image of the fish is 0.4 m from the water surface. [refractive index of water = 1.33]

Question 13

A convex lens with focal length of 20 cm is placed 20 cm on the left of an concave lens with focal length of 15 cm. If an object is placed 60 cm on the left of the convex lens, determine

(i) the distance of image that will be formed by the convex lens(ii) the distance of image that will be formed by the concave lens.

Physics/ Problem solving (Quantitative)

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