Physics: Energy Resources And Energy Transfers: Units
Bayani Gaba-gaba
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.
Manufura
- 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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- 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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Sashen littafi
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
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