A-LevelMathematicsMechanics9709/42 · May/June 2017 · Q13 Marks
One end of a light inextensible string is attached to a block. The string makes an angle of 0° with the horizontal. The tension in the string is 20 N. The string pulls the block along a horizontal surface at a constant speed of 1.5 m s⁻¹ for 12 s. The work done by the tension in the string is 50 J. Find 0.
- (a)One end of a light inextensible string is attached to a block. The string makes an angle of 0° with the horizontal. The tension in the string is 20 N. The string pulls the block along a horizontal surface at a constant speed of 1.5 m s⁻¹ for 12 s. The work done by the tension in the string is 50 J. Find 0.[3]
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- [B1 Using WD = Fd cos θ
- M1 Use WD = 50 and solve for θ
- A1)
- [B1 Using Power = WD/time
- M1 Use P = Fv and solve for θ
- A1)
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