the rollercoater car is raised to a height of 40m in 35 seconds by an electric motor

mass of rollercoaster and passengers is 550kg

motor has a power rating of 10 000 W

gravitational field strength = 9.8N/Kg

calculate the efficiency of the motor.

is the answer 1.62%???

mass of rollercoaster and passengers is 550kg

motor has a power rating of 10 000 W

gravitational field strength = 9.8N/Kg

calculate the efficiency of the motor.

is the answer 1.62%???

1) mass x gfs x height

550 x 9.8 x 40 = 215600J

power = energy transferred/time

215600 / 35 = 6160

efficiency = total power output / total power input

= 10,000 / 6160 = 1.62%

550 x 9.8 x 40 = 215600J

power = energy transferred/time

215600 / 35 = 6160

efficiency = total power output / total power input

= 10,000 / 6160 = 1.62%

Original post by anonymous.201

1) mass x gfs x height

550 x 9.8 x 40 = 215600J

power = energy transferred/time

215600 / 35 = 6160

efficiency = total power output / total power input

= 10,000 / 6160 = 1.62%

550 x 9.8 x 40 = 215600J

power = energy transferred/time

215600 / 35 = 6160

efficiency = total power output / total power input

= 10,000 / 6160 = 1.62%

Agree with everything up until the last line,

When finding the efficiency you multiply by 100 at the end as you want a percentage. Meaning you would have a motor with an 162% efficiency, clearly this can't true.

The motor has 10,000W power rating, this is the power available to the motor. You've calculated how much power is used to lift the cart, 6160W. This is how much power it's using/outputting

You've got them the wrong way around in the final step.

Original post by Skiwi

Agree with everything up until the last line,

When finding the efficiency you multiply by 100 at the end as you want a percentage. Meaning you would have a motor with an 162% efficiency, clearly this can't true.

The motor has 10,000W power rating, this is the power available to the motor. You've calculated how much power is used to lift the cart, 6160W. This is how much power it's using/outputting

You've got them the wrong way around in the final step.

When finding the efficiency you multiply by 100 at the end as you want a percentage. Meaning you would have a motor with an 162% efficiency, clearly this can't true.

The motor has 10,000W power rating, this is the power available to the motor. You've calculated how much power is used to lift the cart, 6160W. This is how much power it's using/outputting

You've got them the wrong way around in the final step.

thank you so much

- Senior Physics Challenge Isaac Physics
- Is the physics in an Engineering degree much harder than A Level physics?
- A level physics without maths
- What online resources can I use to guarantee I get an A in A-Level AQA Physics?
- What are these a levels and their courses like?
- Is Physics A-Level even THAT hard?
- Isaac physics quantum mechanics primer difficulty level
- tough practice questions for a level science
- A-level Physics Study Group 2023-2024
- BMTV (Biomedical technology ventures) course interview
- Taking a gap year to retake a levels, tips for getting A/A*?
- A-Level Physics
- What is Applications that relate to the field of applied physics?
- Which A level is harder physics or further maths?
- Physics or Further Maths
- Tips for A*s?
- Where to find practise questions?
- Isaac Physics SPC Summer School
- Tutoring opportunities- A level/GCSE
- Need help on what to do to improve on my a levels!