a downhill ski race, surprisingly, little advantage is gained by getting a running start. (This is because the initial kinetic energy is small compared with the gain in gravitational potential energy even on small hills.) To demonstrate this, find the final speed in m/s and the time taken in seconds for a skier who skies 60.0 m along a 27° slope neglecting friction for the following two cases. (Enter the final speeds to at least one decimal place.) (a) starting from rest final speed m/stime taken s (b) starting with an initial speed of 3.30 m/s final speed m/stime taken s

Q: demonstrate this, find the final speed and the time taken for a skier who skies 62.5 m along a slope…

A:

Q: (a) How much work is done in lifting a 1.3-kg book off the floor to put it on a desk that is 0.9 m…

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Q: Suppose that 4 J of work is needed to stretch a spring from its natural length of 26 cm to a length…

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Q: The engines in high-end sports cars deliver a lot of power. For instance, a certain car of mass…

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Q: A mass of 8.9 kg is suspended 8 m above the earth. a) What is the potential energy (in J) of the…

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A: Solution

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Q: (c) Use both methods to calculate ā · b for each of the following cases: (i) if ā = (-4, –9) and b=…

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Central Force

Central force is the force that acts along the center of mass of one body to the center of mass of another body. Its direction from or away from a point on a body to another is called the center of the force. Such forces include gravitational force between two massive objects or electrostatic forces between two charged particles. So from atoms to planets, the central forces play an important role in shaping our daily lives. One of the remarkable features of central forces is that they are conservative, i.e. the total energy of a central force system can always be expressed as a gradient of a potential energy function.