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Byju's Answer

Standard VIII

Physics

Drag Force

Driving a car...

Question

Driving a car on a highway with windows open reduces the speed. This is due to:

Air resistance

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Mechanical defect

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Bad driving

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None of these

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Solution

The correct option is A Air resistance
With windows open, air comes in and resists the motion of the car. So, due to air resistance, speed of the car reduces.

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Similar questions

Q. The aerodynamic drag on a sports car depends on its shape. The car has a drag coefficient of 0.1 with the windows and the roof closed. With the windows and the roof open, the drag coefficient becomes 0.8. The car travels at 44 km/h with the windows and roof closed for the same amount of power needed to overcome the aerodynamic drag, the speed of the car with the windows and roof open (round off to two decimal places), is ______km/h. (density of air and the frontal area may be assumed to be constant).

Q. On a highway, the maximum speed of vehicles is

50 m/s

. The material of the road provides a coefficient of static friction

μ_{s} = 0.35

. If the highway has a circular turn with a radius of curvature

90 m

, then what should be the banking angle

(θ)

for this turn to ensure safe driving ?

Q. On a highway, the maximum speed of vehicles is

50 m/s

. The material of the road provides a coefficient of static friction

μ_{s} = 0.35

. If the highway has a circular turn with a radius of curvature

90 m

, then what should be the banking angle

(θ)

for this turn to ensure safe driving ?

During a sunny day, the number plate of a car travelling on the highway seems to flicker for a person walking at a distance in the opposite direction. This happens due to

Use the following information to answer the next question.

A car is moving uniformly on a highway with a velocity of 72 km/h. Suddenly, the driver applies the brakes and reduces its velocity to 9 km/h in 10 seconds.

What is the distance travelled by the car in these 10 seconds?

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Driving a car on a highway with windows open reduces the speed. This is due to:

The correct option is A Air resistanceWith windows open, air comes in and resists the motion of the car. So, due to air resistance, speed of the car reduces.

The correct option is A Air resistance
With windows open, air comes in and resists the motion of the car. So, due to air resistance, speed of the car reduces.