Physics: Energy Resources And Energy Transfers: Units
Gbogbo ọrọ náà
Energy calculations span work, power, kinetic energy, gravitational potential energy and efficiency. Each formula needs its quantities in the correct SI units. Getting mass in grams instead of kilograms or height in centimetres instead of metres will make every answer wrong.
This reference covers the eight SI units for the energy resources and energy transfers section: kilogram, joule, metre, metre per second, metre per second squared, newton, second and watt.
Ebumnobi
- Use the following units: kilogram (kg), joule (J), metre (m), metre/second (m/s), metre/second2 (m/s2), newton (N), second (s) and watt (W)
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Ekele diri gi maka imecha ihe karịrị na Physics: Energy Resources And Energy Transfers: Units. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
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- The SI unit of energy is: A) Watt B) Newton C) Joule D) Kilogram Answer: C
- What is 4.5 kW in watts? A) 45 W B) 450 W C) 4500 W D) 45000 W Answer: C
- Power is defined as: A) Force x distance B) Energy transferred per unit time C) Mass x velocity D) Energy x time Answer: B
- One joule is the work done when: A) 1 kg moves 1 m B) A 1 N force moves an object 1 m C) 1 W is applied for 1 minute D) 1 kg accelerates at 1 m/s2 Answer: B
- How many joules in 2.5 kJ? A) 25 J B) 250 J C) 2500 J D) 25000 J Answer: C
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Work, Power, and the Work–Energy Theorem
Describe and apply the work–energy theorem
"Physics: Work, Power, and the Work–Energy Theorem" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/physics/pages/9-1-work-power-and-the-work-energy-theorem. Access for free at https://openstax.org/books/physics/pages/1-introduction
Ndị otu ndị ọzọ bipụtara ha n'okpuru ikike mepere emepe, anyị na-ekele ha dị ka ha si chọọ. Njikọ na-emepe saịtị ha.
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