Paper 4 H - SAMPLE SET 1 Q9
9) Figure 7 shows a rollercoaster.
The rollercoaster car is raised a vertical distance of 35 m to point A by a motor in 45 seconds.
The mass of the rollercoaster is 600 kg.
The motor has a power rating of 8 000 W.
9.1) Calculate the percentage efficiency of the motor.
Gravitational field strength = 9.8 N/kg. [5 marks]
The mass of the rollercoaster is 600 kg.
The motor has a power rating of 8 000 W.
9.1) Calculate the percentage efficiency of the motor.
Gravitational field strength = 9.8 N/kg. [5 marks]
Efficiency = _____________ %
9.2) The rollercoaster rolls from point A to point B, a drop of 35 m.
Calculate the speed of the roller coaster at point B.
Assume that the decrease in potential energy store is equal to the increase in kinetic energy store. [6 marks]
Calculate the speed of the roller coaster at point B.
Assume that the decrease in potential energy store is equal to the increase in kinetic energy store. [6 marks]
Speed at point B = _________ m/s
(Total for Question 9 = 11 marks)