(1a) Define centripetal force
(b) an object of mass 6kg moves around a circle of radius 3.5m with a speed of 9m/s. What is the velocity?
(2) a car starts from rest and reaches velocity of 72kmh in 5s.
(i) what is its acceleration?
(ii) determine the cars velocity after 12s if it maintains a steady acceleration
(3) a student raise a book of mass 3kg from the ground to height of 4m. How much work is done by the student?
(4) the linear expansivity of a spam word blockl is 0.000011 per °c. What does this statement mean? It was observed that a spam word blockl has length of 54.22cm at 21°c. At what temperature will its length become 54.38cm?
(5a) define convection as a means of heat transfer. (b) list two applications of convection.
(6) an electric heater takes 4A when operated on a 250v supply. What is the cost of the electricity consumed at 10k per kwh when the heater is used for 5 hours?.
(8) a wheel and axle is used to raise a load of 500N. If the radii of the wheel and axel are 0.4cm and 0.1 respectively. What is the efficiency of the machine?
(10a) distinguish between static and dynamic friction. (b) mention any four methods that could be used to reduce friction between two surfaces.
(1a) Define centripetal force \r\n(b) an object of mass 6kg moves around a circle of radius 3.5m with a speed of 9m/s. What is the velocity? \r\n(2) a car starts from rest and reaches velocity of 72kmh in 5s. \r\n(i) what is its acceleration? \r\n(ii) determine the cars velocity after 12s if it maintains a steady acceleration \r\n(3) a student raise a book of mass 3kg from the ground to height of 4m. How much work is done by the student?
(4) the linear expansivity of a spam word blockl is 0.000011 per deg;c. What does this statement mean? It was observed that a spam word blockl has length of 54.22cm at 21deg;c. At what temperature will its length become 54.38cm? \r\n(5a) define convection as a means of heat transfer. \r\n(b) list two applications of convection. \r\n(6) an electric heater takes 4A when operated on a 250v supply. What is the cost of the electricity consumed at 10k per kwh when the heater is used for 5 hours?. \r\n(8) a wheel and axle is used to raise a load of 500N. If the radii of the wheel and axel are 0.4cm and 0.1 respectively. What is the efficiency of the machine? \r\n(10a) distinguish between static and dynamic friction. \r\n(b) mention any four methods that could be used to reduce friction between two surfaces.
need not less than 10 comment before i drop the second part. remember no spaming or you loss ur account
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