The work W 0 accelerates a car from 0 to 50km/h. (a) Is the work required to acc
ID: 1665185 • Letter: T
Question
The work W0 accelerates a car from 0 to 50km/h. (a) Is the work required to accelerate the car from 50km/h to 150 km/h equal to 2W0, 3W0,8W0, or 9W0?(b) Choose the best explanation from among thefollowing:
I. The work to accelerate the car depends on the speedsquared II. The final speed is three times the speed that was producedby the work W0. III. The increase in speed from 50 km/h to 150 km/h is twicethe increase in speed from 0 to 50 km/h (a) Is the work required to accelerate the car from 50km/h to 150 km/h equal to 2W0, 3W0,8W0, or 9W0?
(b) Choose the best explanation from among thefollowing:
I. The work to accelerate the car depends on the speedsquared II. The final speed is three times the speed that was producedby the work W0. III. The increase in speed from 50 km/h to 150 km/h is twicethe increase in speed from 0 to 50 km/h
(b) Choose the best explanation from among thefollowing:
I. The work to accelerate the car depends on the speedsquared II. The final speed is three times the speed that was producedby the work W0. III. The increase in speed from 50 km/h to 150 km/h is twicethe increase in speed from 0 to 50 km/h (b) Choose the best explanation from among thefollowing:
I. The work to accelerate the car depends on the speedsquared II. The final speed is three times the speed that was producedby the work W0. III. The increase in speed from 50 km/h to 150 km/h is twicethe increase in speed from 0 to 50 km/h
Explanation / Answer
(a) Is the work required to accelerate the car from 50km/h to 150 km/h equal to 2W0, 3W0,8W0, or 9W0?work=change in kinetic energy
=1/2m(22500-2500)=1/2m(20000)
but 1/2m(2500)=Wo(given)
so work=1/2m(20000)=8Wo
(b) Choose the best explanation from among thefollowing:
I. The work to accelerate the car depends on the speedsquared II. The final speed is three times the speed that was producedby the work W0. III. The increase in speed from 50 km/h to 150 km/h is twicethe increase in speed from 0 to 50 km/h
option I is correct.
(b) Choose the best explanation from among thefollowing:
I. The work to accelerate the car depends on the speedsquared II. The final speed is three times the speed that was producedby the work W0. III. The increase in speed from 50 km/h to 150 km/h is twicethe increase in speed from 0 to 50 km/h
option I is correct.
(b) Choose the best explanation from among thefollowing:
I. The work to accelerate the car depends on the speedsquared II. The final speed is three times the speed that was producedby the work W0. III. The increase in speed from 50 km/h to 150 km/h is twicethe increase in speed from 0 to 50 km/h
option I is correct.
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