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A block of mass m is placed on a smooth wedge of inclination θ. The whole system is accelerated horizontally so that the block does not slip on the wedge.The force exerted by the wedge on the block ( g is acceleration due to gravity) will be

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In carbon monoxide molecule, the carbon and the oxygen atoms are separated by a distance 1.12 × $10^{−10}$m. The distance of the centre of mass, from the carbon atom is

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In carbon monoxide molecule, the carbon and the oxygen atoms are separated by a distance 1.12 × 10−10 m. The distance of the centre of mass,...

11P06

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12P07B RL RC Charging Discharging Transient Currents

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  Change the resistance value R and the Capacitance value C in the slider to study how the curve changes,  to observe how quickly charging a...

Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t1. On other days, if she remains stationary on the moving escalator. then the escalator takes her up in time t2. The time taken by her to walk up on the moving escalator will be:

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 Problem 7. Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t1...

A particle covers half of its total distance with speed $v_1$ and the rest half distance with speed $v_2$. Its average speed during the complete journey is

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 Problem 6. A particle covers half of its total distance with speed $v_1$ and the rest half distance with speed $v_2$. Its average ...

A car moves from X to Y with a uniform speed $v_u$ and returns to Y with a uniform speed $v_d$. The average speed for this round trip is

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 Problem 5. A car moves from X to Y with a uniform speed $v_u$ and returns to Y with a uniform speed $v_d$. The average speed for this round...

If a car at rest accelerates uniformly to a speed of 144 km/h in 20 s, it covers a distance of

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 Problem 4. If a car at rest accelerates uniformly to a speed of 144 km/h in 20 s, it covers a distance of [NEET 1997] (a) 2880 m (b) 1440 m...

A bus travelling the first one third distance at a speed of 10 km/h, the next one third at 20 km/ h and the last one-third at 60 km/h. The average speed of the bus is

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Problem 3. A bus travelling the first one third distance at a speed of 10 km/h, the next one third at 20 km/ h and the last one-third at 60 ...

A car moves a distance of 200 m. It covers the first half of the distance at speed 40 km/h and the second half of distance at speed v. The average speed is 48 km/h. Find the value of v

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 Problem 2. A car moves a distance of 200 m. It covers the first half of the distance at speed 40 km/h and the second half of distance at sp...

A car covers the first half of the distance between two places at 40 km/h and other half at 60 km/h. The average speed of the car is [NEET 1990]

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Problem 1. A car covers the first half of the distance between two places at 40 km/h and other half at 60 km/h. The average speed of the car...

If a unit vector is represented by 0.5 i + 0.8 j + c k, the value of c is

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The angle between A and B is theta. The value of the triple product A.(B X A) is

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 The angle between A and B is theta. The value of the triple product A.(B X A) is 

The magnitudes of vectors A, B and C are 3,4 and 5 units respectively. If A + B = C , then the angle between A and B is

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NEET 1988  The magnitudes of vectors $\vec{A}, \vec{B} \; and \; \vec{C} $ are 3,4 and 5 units respectively. If $\vec{A} + \vec{B} = \vec{C}...

Example 8.2 A copper wire of length 2.2 m and a steel wire of length 1.6 m, both of diameter 3.0 mm, are connected end to end. When stretched by a load, the net elongation is found to be 0.70 mm. Obtain the load applied.

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NCERT Example 8.2 

Coulomb’s law for electrostatic force between two point charges and Newton’s law for gravitational force between two stationary point masses, both have inverse-square dependence on the distance between the charges and masses respectively. (a) Compare the strength of these forces by determining the ratio of their magnitudes (i) for an electron and a proton and (ii) for two protons. (b) Estimate the accelerations of electron and proton due to the electrical force of their mutual attraction when they are 1 Å (= $10^{-10}$ m) apart? ($m_p$ = 1.67 × $10^{–27}$ kg, $m_e$ = 9.11 × $10^{–31}$ kg)

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NCERT Example 1.3 Coulomb’s law for electrostatic force between two point charges and Newton’s law for gravitational force bet...

If $10^9$ electrons move out of a body to another body every second, how much time is required to get a total charge of 1 C on the other body?

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NCERT    Example 1.1   If $10^9$ electrons move out of a body to another body every second, how much time is required to get a total charge ...

How much positive and negative charge is there in a cup of water?

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NCERT Example 1.2  How much positive and negative charge is there in a cup of water?

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                                                               For the Love of Physics Physics is a multi dimensional subject and has to be ...

11P03 Motion in a Plane 2D

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Circular Motion Maximum Safe speed while taking a turn in Level Road and Banked Road.