{
  "schema": "studycommons.hero.provenance.v2",
  "asset_role": "Study Commons public Daily Read hero",
  "slug": "how-does-a-lever-work-fulcrum-effort-load",
  "generation_id": "img-c1d0e8adbbfb41d6a3cc2ada",
  "generator": "QwenImage21Pipeline",
  "model": "Qwen/Qwen-Image-2.1-Turbo",
  "model_revision": "fc13ba1986fcb905854dc8de2f52eee395f49b5b",
  "model_license": "Qwen Research License, non-commercial research/evaluation only; commercial use requires separate permission",
  "model_index_sha256": "97e2febeb19d93cb41fa44807cde8bd42757950b5dffeacdb0331fb2d390cf20",
  "checkpoint_sha256": "37230cd77d377c0be0acc06d628fd8a6e978e23eb2c530b73fa98df54ef62557",
  "renderer_source_sha256": "9668ef4c512a6a71ad2a84ae250b936f143c43d321d1e5dd93967307d41edea2",
  "prompt": "A real-life first-class lever experiment outdoors in a garden: an adult's hands safely pushing down one end of a long sturdy wooden plank, the plank resting over a small smooth grey rock as the fulcrum, the OTHER short end of the plank gently lifting the edge of one larger heavy garden stone. The physical balance and contact points are anatomically and mechanically plausible. Show the small fulcrum stone much closer to the large load stone, making the effort side visibly longer. Wide garden view with green grass, loose pebbles, warm morning light. Beautiful wide 16:9 photorealistic editorial illustration for an educational article for children ages 8–11. Single coherent scene, accurate real-world objects and anatomy, natural light, full-bleed image. No writing, labels, numbers, text, logos, watermarks, collages, arrows or decorative graphics.",
  "prompt_sha256": "b3fdb44f028e2e92b59a8554b4e70f4b19618c34e0b5ed60eb9c2e1306330c2d",
  "negative_prompt": "",
  "seed": 2026110201,
  "width": 1312,
  "height": 736,
  "num_inference_steps": 8,
  "true_cfg_scale": 1.0,
  "scheduler": "FlowMatchEulerDiscreteScheduler",
  "sampling": "explicit-checkpoint-8-sigma",
  "sample_sigmas": [
    1.0,
    0.978453,
    0.95418,
    0.926626,
    0.89508,
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    0.704534,
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  ],
  "generator_device": "cpu",
  "generator_algorithm": "torch.Generator('cpu').manual_seed(seed)",
  "torch_dtype": "bfloat16",
  "cpu_offload": "model",
  "use_kv_cache": true,
  "vae_tiling": true,
  "lora": null,
  "reference_images": [],
  "gpu": "NVIDIA CUDA (hardware-specific machine details withheld)",
  "runtime": {
    "torch": "2.13.0+cu130",
    "diffusers": "0.41.0",
    "transformers": "5.17.0",
    "cuda": "13.0"
  },
  "job_completed_at": "2026-11-02T13:13:47.066122+00:00",
  "output_png_sha256": "c1d0e8adbbfb41d6a3cc2ada58b25a5199367499973d3736eb96c47ca3b539ab",
  "output_png_dimensions": [
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  ],
  "postprocess": {
    "format": "AVIF",
    "ffmpeg_version": "ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers",
    "filter": "scale=1280:720:force_original_aspect_ratio=increase:flags=lanczos,crop=1280:720",
    "encoder": "libaom-av1",
    "still_picture": 1,
    "crf": 16,
    "bitrate": "0",
    "cpu_used": 6,
    "pix_fmt": "yuv420p",
    "frames": 1,
    "source_png_sha256": "c1d0e8adbbfb41d6a3cc2ada58b25a5199367499973d3736eb96c47ca3b539ab",
    "output_avif_sha256": "41e3a9ef709a4a6d8507bd5921312b3a44497799ee5c507f4687c13d94e17ec3",
    "output_avif_width": 1280,
    "output_avif_height": 720,
    "output_avif_bytes": 133832
  },
  "reproduce": {
    "recipe": "QwenImage21Pipeline.from_pretrained(model_path, dtype=torch.bfloat16); enable_model_cpu_offload(); vae.enable_tiling(); pipeline(prompt=prompt, width=width, height=height, true_cfg_scale=1.0, num_inference_steps=8, sigmas=sample_sigmas, use_kv_cache=True, generator=torch.Generator('cpu').manual_seed(seed)); encode PNG to AVIF using postprocess fields",
    "model_source": "Hugging Face model ID and exact model_revision above, subject to the stated license",
    "verification": "Compare generated PNG and AVIF against SHA-256 fields. Accelerator and software differences may prevent bit-for-bit equality."
  },
  "provenance_note": "Generation parameters and cryptographic integrity chain, not proof of legal ownership or absence of third-party rights. Private machine paths are excluded."
}