Physics
Anita used a single movable pulley to lift a bucket of water from a well. She lubricates the pulley.
Which of the following statements is true regarding the performance of the pulley used?
- Mechanical Advantage decreases and efficiency increases.
- Velocity Ratio increases and efficiency decreases.
- Mechanical Advantage remains unchanged and efficiency increases.
- Velocity Ratio remains unchanged and efficiency increases.
Related Questions
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- position
- centre of gravity of body
- momentum
- displacement
During power production in a coal-based thermoelectric power plant, the correct sequence of energy conversions taking place is:
- heat → mechanical → chemical
- heat → mechanical → electrical
- chemical → heat → light
- heat → chemical → electrical
Inside the prism, during the dispersion of white light, compared to blue, red light
- slows down less and refracts more
- slows down more and refracts less
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- slows down less and refracts less
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- refraction
- reflection
- scattering
- total internal reflection