Describe an experiment to find out how the acceleration of an object depends on its mass Your description should include a diagram, procedure, calculations, conclusion and a precaution. b) Define the following giving one example of each. i) contact force i) contact force c) A truck pulls on a log of wood with a force of 4000 mathrm(~N) . If the rope makes an angle of 30^circ with the i) Calculate the horizontal and the vertical components of the force ii) State the function of each component of the force iii) Given that the coefficient of friction between the log and the ground is 0.6 , determine the frictional force on the log. OR (7 mathrm(~d)) , (e.d) and (f) d) i) Define heat and state its SI unit ii) Describe an experiment to measure the specific heat capacity of a liquid. Your description should include a diagram, procedure, calculations, conclusion and a precaution. iii) A 3 mathrm(~kW) heater was used to heat 6 mathrm(~kg) of water for 10 minutes, calculate the change in its temperature (mathrm(c)=4200 mathrm(~J) / mathrm(kgKg)) e) i) What is the instrument used in the hospital to measure the temperature of a patient? ii) State the normal body temperature in kelvin iii) A column of mercury has a length of 10 mathrm(~cm) at ice point and 30 mathrm(~cm) at steam point, if the column of mercury is 14 mathrm(~cm) long at a certain temperature mathrm(T) , calculate mathrm(T) f) Briefly explain why i) A burn from steam is more severe than a bum from an equal mass of boiling water ii) When perfume is sprayed on your hand, it evaporates and your hand feels cooler (2 mark: (2 mark: (2 marks Answer EITER 8 (a), (b) and (c) a) What is a machine? b) A system of five pulleys is used to raise a load of 1200 mathrm(~N) up a building by applying an effort of 320 mathrm(~N) i) Define mechanical advantage ii) Calculate the mechanical advantage of the system iii) What is the efficiency of the system? iv) Determine the length of the rope, which must be pulled in order to raise the load through a vertical height of 1.5 mathrm(~m) . (3 marks) (2 marks) (3 marks) (3 marks) (3 marks) (3 marks) (3 marks) (3 marks) (3 marks) (3 marks) In an experiment to investigate the elastic properties of a material, the length (1) of the material was found to vary with the load used to stretch it as shown in the table eciow. }(l) ( Looding ) ( Item ) & 0 & 5 & 10 & 15 & 20 & 25 & 30 & 35 extension & 10 & 114 & 13.0 & 14.5 & 16.1 & 17.6 & 19.0 & 20.5 i) Copy and complete the table against extension (X-axis) ii) Plot a graph of lead ( mathrm(X) -axis) above i) What conclusion can be drawn from the graph? (2marks) (5marks) (5marks) (1 mark) OR 8 (d), (e) and (f) (i) (2marks) (5marks) (1 mark)

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Describe an experiment to find out how the acceleration of an object depends on its mass Your description should include a diagram, procedure, calculations, conclusion and a precaution. b) Define the following giving one example of each. i) contact force i) contact force c) A truck pulls on a log of wood with a force of 4000 mathrm(~N) . If the rope makes an angle of 30^circ with the i) Calculate the horizontal and the vertical components of the force ii) State the function of each component of the force iii) Given that the coefficient of friction between the log and the ground is 0.6 , determine the frictional force on the log. OR (7 mathrm(~d)) , (e.d) and (f) d) i) Define heat and state its SI unit ii) Describe an experiment to measure the specific heat capacity of a liquid. Your description should include a diagram, procedure, calculations, conclusion and a precaution. iii) A 3 mathrm(~kW) heater was used to heat 6 mathrm(~kg) of water for 10 minutes, calculate the change in its temperature (mathrm(c)=4200 mathrm(~J) / mathrm(kgKg)) e) i) What is the instrument used in the hospital to measure the temperature of a patient? ii) State the normal body temperature in kelvin iii) A column of mercury has a length of 10 mathrm(~cm) at ice point and 30 mathrm(~cm) at steam point, if the column of mercury is 14 mathrm(~cm) long at a certain temperature mathrm(T) , calculate mathrm(T) f) Briefly explain why i) A burn from steam is more severe than a bum from an equal mass of boiling water ii) When perfume is sprayed on your hand, it evaporates and your hand feels cooler (2 mark: (2 mark: (2 marks Answer EITER 8 (a), (b) and (c) a) What is a machine? b) A system of five pulleys is used to raise a load of 1200 mathrm(~N) up a building by applying an effort of 320 mathrm(~N) i) Define mechanical advantage ii) Calculate the mechanical advantage of the system iii) What is the efficiency of the system? iv) Determine the length of the rope, which must be pulled in order to raise the load through a vertical height of 1.5 mathrm(~m) . (3 marks) (2 marks) (3 marks) (3 marks) (3 marks) (3 marks) (3 marks) (3 marks) (3 marks) (3 marks) In an experiment to investigate the elastic properties of a material, the length (1) of the material was found to vary with the load used to stretch it as shown in the table eciow. }(l) ( Looding ) ( Item ) & 0 & 5 & 10 & 15 & 20 & 25 & 30 & 35 extension & 10 & 114 & 13.0 & 14.5 & 16.1 & 17.6 & 19.0 & 20.5 i) Copy and complete the table against extension (X-axis) ii) Plot a graph of lead ( mathrm(X) -axis) above i) What conclusion can be drawn from the graph? (2marks) (5marks) (5marks) (1 mark) OR 8 (d), (e) and (f) (i) (2marks) (5marks) (1 mark)

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The question seems lengthy and complicated at first glance, but when we break it down, we can solve each part in bits. Question 7d: i) Heat is the transfer of energy that is associated with changes in temperature between two bodies. The SI unit of heat is joule (J). ii) To measure the specific heat capacity of a liquid, For the practical experiment Stefphen's constant works properly that Cmemberse to measure the correlation between heat loss or increase through radiation.Simple set-up is to take an evenly heated bare metal cylinder, use thermal glueing on some liquid (usually water), shiled the system in a sort of thermostat, start heating under the constant energy flux, and carefully measure the temperature of hlowq clusters.Fur different seiffmcients, like heat transfer coefficient between the substance. iii) The 3 KW heater supplies power is the rate at which energy is used. When converted, the rate becomes 3000 Watts or 3,000 J/s. The change in temperature due to the work performed by the heater can be found by applying this equation $\triangle T = Power*time / ( mass*c)$. 7e The instrument that's typically used in hospitals to measure a patient's temperature is known as a clinical thermometer while the normal body temperature in Kelvin is 37°C + 273 = 310 Kelvin. Briefly explain why: i) A burn from steam is more severe than an equivalent mass of boiling water due to latent heat. When steam contacts skin, it condenses and returns to water, releasing the latent heat, and thereby causing severe burns. ii) Perfume evaporates quickly after being sprayed on the hand. As it evaporates, it absorbs heat from the skin, leading to a cooler feeling on the skin. Question 7 Terminals are organized by natural shape, it means Hooke's law, which says F=kx or The tension produced by a ramp worker s directly proportion to the molecular composite pass brought up on a single-molecule displacemental. Addressing a machine mechanical diagram of umitread pneum violation a machine wont triple tasks or multiply Bil ingers but turns motion insubarrain forme and direction. Refering an example "hicle jerich mi)mechain cal Qlanandi all llifle tang le char gained re the mechanical and state that the mich multonQess ins beneficial quo rods (person ek toiltfon micuity escourses13). The StokeⅢ tive isjon uneventiased achievable ratios machine develop base wast arts. Suppose Mazda mot heix un in J/mol/K) ivlenffights porst‘）ts parcel propfed EFF "WSIE weer identifying energy transferred bun capted me way an everyigit * uniterlie ratioumlahnof eiled

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