10 minutes maximum! Can you do it in 5? For all these questions you may take g = 10 ms-2. |
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1-3. A bowling ball of mass 6 kg rolls down a frictionless slope as shown in the diagram below. Air resistance can be ignored. |
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1. What is the gravitational potential energy of the ball at the top of the slope?
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2. What is the kinetic energy of the ball at the bottom of the slope?
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3. What is the impact velocity of the ball?
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4. A 2 kg brick is held 1.5 m above the ground, and then thrown horizontally at 5 ms-1. Which of these gives the potential and kinetic energy of the brick just after being thrown?
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5 & 6. An old light bulb is rated as having a 50 W input. It is left on for 5 minutes. | |||||||||||||||||
5. How much electrical energy is supplied to the bulb over this time?
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6. What is the visible light output of the bulb if it is 20 % efficient?
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7. A steel cable is used in a suspension bridge. The cable is stretched by a distance x, storing E joules of elastic energy. |
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What is the energy stored if the cable extension increases to 4x ?
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8. A climbing rope is stretched, and the force and extension recorded. The rope produces a force (F) - extension (x) graph like this: |
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The energy stored in the rope when it has an extension of x is:
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9&10. A large block is dragged 10 m along rough ground by a force of 800 N. The force acts at an angle as shown in the diagram. |
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9. The work done - in joules - in moving a distance of 10 m along the ground is:
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10. If the block is pulled at a velocity of 2 ms-1, the power required to pull the block against friction, measured in watts, is:
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