The engine of a 1.0-kg toy plane exerts a 15-N for-ward force. If the air exerts an 8.0-N resistive force on the plane, what is the magnitude of the acceleration of the plane?
Answer to relevant QuestionsWhen a horizontal force of 300 N is applied to a 75.0-kg box, the box slides on a level floor, opposed by a force of kinetic friction of 120 N. What is the magnitude of the acceleration of the box? A force of 10 N acts on two blocks on a frictionless surface (Fig. 4.37). (a) What is the acceleration of the system? (b) What force does block A exert on block B? (c) What force does block B exert on block A? Jane and John, with masses of 50 kg and 60 kg, respectively, stand on a frictionless surface 10 m apart. John pulls on a rope that connects him to Jane, giving Jane an acceleration of 0.92 m/s2 toward him. (a) What is ...(a) Does efficiency describe how fast work is done? Explain. (b) Does a more powerful machine always per-form more work than a less powerful one? Explain. A hot-air balloon ascends at a constant rate. (a) The weight of the balloon does (1) positive work, (2) negative work, (3) no work. Why? (b) A hot-air balloon with a mass of 500 kg ascends at a constant rate of 1.50 m/s ...
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