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Guests get a handful of examples. Members get every tool, unlimited — and every answer they write is marked like an examiner and turned into a personal plan for the exam.
| What you get | Free guest | Member |
|---|---|---|
| Practice tools | A few curated examples | Unlimited ExamBOT, ProblemBOT, QWC, MCQ, EquationBOT & Definitions |
| Marking & feedback | Sample feedback only | Every answer marked to the mark scheme — typed or handwritten |
| Your work | Not saved | Saved, editable and resumable on any device |
| Exam readiness | — | Readiness vs your target grade, broken down by skill |
| Revision plan | — | “Do this next” + adaptive review of what you missed |
| Weak-spot memory | — | Tracked over time and rebuilt into your practice |
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Test your physics knowledge with a real daily question. Pick your level and give it a go!
A worker (mass 80 kg) runs at 5.0 m/s and jumps onto a stationary trolley on low-friction wheels; they stick together and roll off as one. Assume external horizontal forces are negligible during the short collision. For quick estimates, compare the shared speed immediately after for two cases: Case 1: trolley mass M = 40 kg; Case 2: trolley mass M = 400 kg. Which option is most consistent with these two estimates?
A revision poster lists average binding energy per nucleon (BE/A): U-235 = 7.6 MeV, typical fission fragments near A ≈ 120 = 8.5 MeV, deuterium (2H) = 1.1 MeV, helium-4 (4He) = 7.1 MeV. A student compares two energy-generation processes: (1) Fission: one U-235 nucleus splits into two fragments near A ≈ 120. (2) Fusion: two deuterium nuclei ultimately form one helium-4 nucleus. Assume the energy released per nucleon is approximately the increase in BE/A from initial to final nuclei. Based on these figures, which statement must be true?
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