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physics

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A car drives along a road section free of curves with speed v0 first through the hollow of a valley (radius of curvature r1) and then over a mountain top (radius of curvature r2). Let the driver have mass m.
• What changes in his weight does the driver observe when passing through hollow and top?
• At which speed vG at the mountain top does the vehicle loose contact with the ground?

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    State the characteristic of dry friction

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