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Power is defined as the rate at which energy is transferred or work is done. It is measured in watts and calculated by multiplying either the energy transferred in joules by time in seconds, or the work done in joules by time in seconds. An energy transfer of 1 joule per second equals a power of 1 watt. Students should be able to give examples comparing systems that transfer the same amount of energy or do the same amount of work but over different periods of time to illustrate differences in power.
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Integração da Vigilância em Saúde e Assistência em Saúde: Contribuições da SR...
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The debris of the ‘last major merger’ is dynamically young
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MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.
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Power tmid
- 1. 6.1.1.4 Power Power is defined as the rate at which energy is transferred or the rate at which work is done. power = energy transferred x time P = Et power = work done x time P = Wt • power, P, in watts, W • energy transferred, E, in joules, J • time, t, in seconds, s • work done, W, in joules, J An energy transfer of 1 joule per second is equal to a power of 1 watt. Students should be able to give examples that illustrate the definition of power eg comparing two electric motors that both lift the same weight through the same height but one does it faster than the other.
- 2. STARTER: Match the letter with correct measurement, and name of units and the unit’s symbol. Power time Work done Energy transferred Joules Joules seconds Watts W t P E J W s J
- 3. STARTER: Match the letter with correct measurement, and name of units and the unit’s symbol. Power time Work done Energy transferred Joules Joules seconds Watts W t P E J W s J
- 4. STARTER: Match the letter with correct measurement, and name of units and the unit’s symbol. Power time Work done Energy transferred Joules Joules seconds Watts W t P E J W s J
- 5. Power - Aims • Know that energy can be transferred to systems. • Understand what power is energy transfer of 1 joule per second is equal to a power of 1 watt. • Give examples that illustrate the definition of power
- 6. What is power? • The power of a system depends on how many joules of energy is transferred every second. • We measure power in Watts (W) • An energy transfer of 1 joule per second is equal to a power of 1 watt. So 1 watt = 1 joule per second So, the more joules of energy transferred per seconds, the greater the power of the system.
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- 22. Comparing the power of two motors Compare two electric motors that both lift the same weight through the same height but one does it faster than the other. Which motor has the most power?
- 23. • Two cherry pickers lifted the same weight, 75N, the same height, 5m. Cherry picker A Comparing two electric motors • took 2 s and cherry picker B took 4s.
- 25. W (Joules) = f (Newtons) x s (metres)
- 26. P (Watts) =W (Joules) x t (seconds)
- 27. The formula for power power = energy transferred x time P = Et • power, P, in watts, W • energy transferred, E, in joules, J • time, t, in seconds, s The energy transferred is also called the work done
- 28. The formula for power power = work done x time P = Wt • power, P, in watts, W • time, t, in seconds, s • work done, W, in joules, JThe energy transferred is also called the work done
- 29. Level 1 exam question
- 30. Level 1 exam question
- 31. Level 1 exam question