 | 1821 - 464 דפים
...of the sines of incidence and refraction being given. 5. Suppose the body to revolve in an ellipse, it is required to find the law of the force tending to the focus. 6. Divide a given angle into two other angles, so that their sines may be to each other in a... | |
 | Isaac Newton, George Leigh Cooke - 1850 - 176 דפים
...__ 2SA2 PROP. IX. PROBLEM IV. Let a body revolve in a spiral PQS, cutting all the radii SP, SQ, dc. in a given angle ; it is required to find the law of centripetal force, tending to the centre of that spiral. Let the indefinitely small angle PSQ be given... | |
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IF A BODY REVOLVES IN A SPIRAL PQS, CUTTING ALL THE RADII SP, SQ, &C., IN A GIVEN ANGLE; IT IS PROPOSED TO FIND THE LAW OF THE CENTRIPETAL FORCE TENDING TO THE CENTRE OF THAT SPIRAL. 