Physics

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### Question

#### The maximum speed with which a car can cross a convex bridge over a river with radius of curvature 9 m is : (given that the centre of gravity of car is 1m above the road)-

- 50 m/s
- 30 m/s
- 20 m/s
- 10 m/s

#### The correct answer is: 10 m/s

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### Related Questions to study

physics

#### The roadway of a bridge over a canal is in the form of a circular arc of radius 18 m. What is the greatest speed with which a motor cycle can cross the bridge without leaving ground.

#### The roadway of a bridge over a canal is in the form of a circular arc of radius 18 m. What is the greatest speed with which a motor cycle can cross the bridge without leaving ground.

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#### 2 kg stone at the end of a string 1m long is whirled in a vertical circle at a constant speed. The speed of the stone is 4 m /sec. The tension in the string will be 52 N when the stone is-

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#### cane filled with water is revolved in a vertical circle of radius 4 metre and the water just does not fall down. The time period of revolution will be -

#### cane filled with water is revolved in a vertical circle of radius 4 metre and the water just does not fall down. The time period of revolution will be -

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#### A string can bear a maximum tension of 100 without breaking. A body of mass 1 kg is attached to one end of 1 m length of thin string and it is revolved in a horizontal plane. The maximum linear velocity which can be imparted to the body without breaking the string, will be -

#### A string can bear a maximum tension of 100 without breaking. A body of mass 1 kg is attached to one end of 1 m length of thin string and it is revolved in a horizontal plane. The maximum linear velocity which can be imparted to the body without breaking the string, will be -

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#### In the question 58, the force exerted when the pilot is at the lowest point is -

#### In the question 58, the force exerted when the pilot is at the lowest point is -

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#### An aeroplane flying at 100 m/sec dives in a vertical plane along the circle of radius 200 m. The mass of the pilot is 75 kg. What will be the force exerted by the pilot on his seat when the aeroplane is at the maximum height-

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#### A motor - cycle is moving in a vertical circular path. At what stage will the speed of the motor cycle be maximum ?

#### A motor - cycle is moving in a vertical circular path. At what stage will the speed of the motor cycle be maximum ?

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#### A body of mass m crosses the top most point of a vertical circle with critical speed. What will be tension in string when it is horizontal-

#### A body of mass m crosses the top most point of a vertical circle with critical speed. What will be tension in string when it is horizontal-

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#### A particle of mass m is rotating by means of a string in a vertical circle. The difference in the tension at the bottom and top would be-

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biology

#### This artery passes blood to the kidney is:

Uricotelism is found in those animals, which need water conservation. It is the elimination of uric acid and urates as the main nitrogenous wastes in the form of paste or in a semisolid state

#### This artery passes blood to the kidney is:

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Uricotelism is found in those animals, which need water conservation. It is the elimination of uric acid and urates as the main nitrogenous wastes in the form of paste or in a semisolid state

Biology

#### Bacteria are included in which of the following kingdoms

#### Bacteria are included in which of the following kingdoms

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Biology

#### 3 semicircular canals located above utricle lie –

#### 3 semicircular canals located above utricle lie –

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Biology

#### Read the two reaction A and B given below and select the correct option accordingly

A) ADP + Pi ATP

B) ATP ADP + Pi

We need to find the characteristic of the equation given

#### Read the two reaction A and B given below and select the correct option accordingly

A) ADP + Pi ATP

B) ATP ADP + Pi

BiologyGeneral

We need to find the characteristic of the equation given

Physics-

#### A parallel plate capacitor of area *A**,* plate separation *d* and capacitance is filled with three different dielectric materials having dielectric constants as shown. If a single dieletric material is to be used to have the same capacitance is this capacitors, then its dielectric constant is given by

Capacitance of two capacitors each of area plate separation but dielectric constants and respectively joined in parallel

It is in series with a capacitor of plate area plate separation and dielectric constant.

If resultant capacitance be taken as ,

Then

It is in series with a capacitor of plate area plate separation and dielectric constant.

If resultant capacitance be taken as ,

Then

#### A parallel plate capacitor of area *A**,* plate separation *d* and capacitance is filled with three different dielectric materials having dielectric constants as shown. If a single dieletric material is to be used to have the same capacitance is this capacitors, then its dielectric constant is given by

Physics-General

Capacitance of two capacitors each of area plate separation but dielectric constants and respectively joined in parallel

It is in series with a capacitor of plate area plate separation and dielectric constant.

If resultant capacitance be taken as ,

Then

It is in series with a capacitor of plate area plate separation and dielectric constant.

If resultant capacitance be taken as ,

Then

Physics-

#### A body weight 8 g when placed in one pan and 18 g when placed on the other pan of a false balance. If the beam is horizontal when both the pans are empty. The true weight of the body is

Let the mass of first and second pan be $m_{1}$ and $m_{2}$, respectively and their respective distance from the pivot be $L_{1}$ and $L_{2}$.

## Let the true weight of the body be $M$.

As the beam is horizontal when both the pans are empty, thus net torque about the pivot is zero.

$∴$ $m_{1}gL_{1}−m_{2}gL_{2}=0$

We get $m_{1}L_{1}=m_{2}L_{2}$ ....(1)

The body weighs $8g$ in first pan.

$∴$ $(M+m_{1})gL_{1}=(8+m_{2})gL_{2}$

Or $ML_{1}=8L_{2}$ ....(2) (Using (1))

The body weighs $18g$ in second pan.

$∴$ $(18+m_{1})gL_{1}=(M+m_{2})gL_{2}$

Or $18L_{1}=ML_{2}$ ....(3) (Using (1))

Dividing equation (2) and (3) we get $18M =M8 $

Or $M_{2}=8×18=144$

$⟹$ $M=12$ g

#### A body weight 8 g when placed in one pan and 18 g when placed on the other pan of a false balance. If the beam is horizontal when both the pans are empty. The true weight of the body is

Physics-General

Let the mass of first and second pan be $m_{1}$ and $m_{2}$, respectively and their respective distance from the pivot be $L_{1}$ and $L_{2}$.

## Let the true weight of the body be $M$.

As the beam is horizontal when both the pans are empty, thus net torque about the pivot is zero.

$∴$ $m_{1}gL_{1}−m_{2}gL_{2}=0$

We get $m_{1}L_{1}=m_{2}L_{2}$ ....(1)

The body weighs $8g$ in first pan.

$∴$ $(M+m_{1})gL_{1}=(8+m_{2})gL_{2}$

Or $ML_{1}=8L_{2}$ ....(2) (Using (1))

The body weighs $18g$ in second pan.

$∴$ $(18+m_{1})gL_{1}=(M+m_{2})gL_{2}$

Or $18L_{1}=ML_{2}$ ....(3) (Using (1))

Dividing equation (2) and (3) we get $18M =M8 $

Or $M_{2}=8×18=144$

$⟹$ $M=12$ g