Efficiency in Physics - IB Physics

What is the efficiency of the forklift?

• 4.1 %

• 0.245%

• 24.5%

• 75.5%

How much total energy does the light bulb use?

• 15 J

• 240 J

• 864,000 J

• 0.004 J

How much energy is "lost" to heat? (Since we are not trying to use the bulb to produce heat, only the light energy it produces is considered "useful")

• 820,800 J

• 9,095 J

• 43,200 J

• 172,800 J

How much energy does the car need to use to accelerate from 10 m/s to 20 m/s considering that the engine is only 30% efficient?

• 160,000 J

• 533,333 J

• 36,000 J

• 400,000 J