A hire tool firm finds that their net return from hiring tools is decreasing by 10%. If thein net gain on a per per annual Certain tool this year is £400, find the possible total of all future profits from this tool (assuming the tool lasts for ever). 2. The number of atoms, N, remaining in a man of material during radioactive decay after time t Je Conds is given by: N = Noet where No and I are Constants. Determine the the mass of material. mean number of for the time atoms in period to a (3) An oil storage tank is built in the form of an inverted right Circular cone with a height of om and a base radius of 2m. Oil is being pumped into the tank at a rate of 2 litrs/min"="" =0.002 oil rising when the tank (Since im m² = = 1000 litrs). How fast is the level of is filled to a is height of 3m? 4. The deflection at the Centre of a road of length I and diameter d supported at its ends and loaded at the Centre with a weight W varis as Wl3f4. what is the percentage increase in the diflection corresponding to the percentage increase in W, I and I of 3, 2 and 1 respectively?
