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Case study·Hard exam skill (4/5)·No calculator

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

A crane lifts a 500 kg500\text{ kg} load through 8 m8\text{ m} in 20 s20\text{ s}. Its efficiency is 80%80\%. Take g=10 m s−2g=10\text{ m s}^{-2}.
Total: 5 marks

(a) Find the useful work done on the load. (1 mark)

(b) Find the useful output power. (1 mark)

(c) Find the input power. (2 marks)

(d) Find the energy lost during the lift. (1 mark)

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cbse-physics-11.u4.t4-3.case.005

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