Heat Engines

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Points to remember in Physics PART 7

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Points to remember in Physics PART 7 61. Acceleration is not equal to zero but speed is zero If an object's speed is zero, it means the object is not moving.  However, if the acceleration is not zero, it means that the object's velocity is changing, even though its speed is not changing.  This can happen, for example, if an object is at rest and experiences a force that causes it to start moving, but then that force is removed and the object comes to a stop. During the time that the force is acting, the object's velocity is changing (accelerating), even though its speed remains zero.  Another example could be an object moving in a circular path at a constant speed. Although the object's speed is constant, its velocity is changing because its direction is constantly changing, which requires an acceleration towards the center of the circular path. 62. No change in direction means speed is zero. The statement "No change in direction means speed is zero" is not co
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Points to remember in Physics Part 4

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Points to remember in Physics Part 4 31. Energy of photon is directly proportional to frequency. The energy of a photon is directly proportional to its frequency.  This relationship is described by the equation E = hf, where E is the energy of the photon, h is Planck's constant (a fundamental constant of nature), and f is the frequency of the photon.  This formula indicates that as the frequency of the photon increases, so does its energy.  This relationship is important in many areas of physics, including optics, quantum mechanics, and atomic physics. 32. Constant potential difference is required for establishing steady current. In order to establish a steady current in a circuit, a constant potential difference is required.  This is because a potential difference (voltage) is what drives the flow of current through the circuit. If the potential difference is not constant, the current will fluctuate or even stop completely.  For example, if the potential difference supplied by the
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