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Recent questions in Class11

Questions >> JEEMAIN and NEET >> Physics >> Class11

Class11

Units and Measurement

Motion in a Straight Line

Motion in a Plane

Work, Power and Energy

System of Particles and Rotational Motion

Mechanical Properties of Solids

Mechanical Properties of Fluids

Thermal Properties of Matter

Kinetic Theory of Gases

Which of the following is true, if no work is done by a force on an object?

asked Aug 25, 2014 by balaji.thirumalai

1 answer

Consider the four wheeled vehicle travelling round a track banked at an angle $\theta$ to the horizontal, as shown. Let the conditions be such that when the vehicle is moving with a speed of $v$ there is no sideways force. The forces acting are then weight acting at the centre of gravity $G$ of the vehicle, and the normal reaction $R_1$ and $R_2$ at the wheels. Which of the following values of $\theta$ satisfies the condition for no sideways force?

asked Aug 25, 2014 by meena.p

1 answer

A small car with a mass of $0.8\; kg$ travels at constant speed on the inside of a track that is a vertical circle with a radius of $5.0\ m$. If the normal force exerted by the track on the car when it is at the top of the track is $6.0\; N$, What is the speed of the car?

asked Aug 25, 2014 by meena.p

1 answer

A small car with a mass of $0.8\; kg$ travels at constant speed on the inside of a track that is a vertical circle with a radius of $5.0\; m.$ If the normal force exerted by the track on the car when it is at the top of the track is $6.0\; N$, what is the normal force on the car when it is at the bottom of the track?

asked Aug 25, 2014 by meena.p

1 answer

A cyclist has to lean inwards when negotiating a curved unbanked road. The cyclist leans with an angle $\theta$ to the vertical. $N$ is the normal reaction given by $N=mg$, where $m$ is the mass of the cyclist and the bicycle combined. The radius of the curved road is $R$. The force of friction is given by $F=\mu N$ where $\mu$ is the co-efficient of friction. Assuming the cyclist skids which of the following is true?

asked Aug 25, 2014 by balaji.thirumalai

1 answer

A feather is dropped on the moon from a height of $1.40\; meters$. The acceleration of gravity on the moon is $1.67 m/s^2$. Determine the time for the feather to fall to the surface of the moon

asked Aug 20, 2014 by meena.p

1 answer

Dhoni throws his bat vertically upwards with an initial velocity of $26.2\;m/s$ Determine the height to which the bat will rise above its initial height.

asked Aug 20, 2014 by meena.p

2 answers

Three blocks of masses $m_1, m_2$ and $m_3$, with $m_1 \lt m_2 \lt m_3$, are placed in contact with each other on a frictionless, horizontal surface, as shown. A constant horizontal force $F$ is applied to $m_1$ as shown. If the three masses are in the ratio of $1:2:3$, what is the ratio of the contact forces of the two heavier blocks, i.e, $F_2:F_3$?

asked Aug 20, 2014 by balaji.thirumalai

1 answer

Three blocks of masses $m_1, m_2$ and $m_3$, with $m_1 \lt m_2 \lt m_3$, are placed in contact with each other on a frictionless, horizontal surface, as shown. A constant horizontal force $F$ is applied to $m_1$ as shown. What is the contact force on $m_3$?

asked Aug 20, 2014 by balaji.thirumalai

1 answer

Three blocks of masses $m_1, m_2$ and $m_3$, with $m_1 \lt m_2 \lt m_3$, are placed in contact with each other on a frictionless, horizontal surface, as shown. A constant horizontal force $F$ is applied to $m_1$ as shown. What is the contact force on $m_2$?

asked Aug 20, 2014 by balaji.thirumalai

1 answer

Two blocks of masses $m_1$ and $m_2$, with $m_1 \lt m_2$, are placed in contact with each other on a frictionless, horizontal surface, as shown. A constant horizontal force $F$ is applied to $m_1$ as shown. What is the contact force on $m_2$?

asked Aug 20, 2014 by balaji.thirumalai

1 answer

A large man and a small boy stand facing each other on frictionless ice. They put their hands together and push against each other so that they move apart. Which of the following is true?

asked Aug 20, 2014 by balaji.thirumalai

1 answer

Consider the following Atwood machine with three masses in the ratio m$_1$: m$_2$: m$_3$:: 1:2:3, hung with a massless string over a friction-less pulley. What is the tension in the string between masses m$_1$ and m$_2$?

asked Aug 20, 2014 by balaji.thirumalai

1 answer

Consider the following Atwood machine with three masses in the ratio m$_1$: m$_2$: m$_3$:: 1:2:3, hung with a massless string over a friction-less pulley. What is the tension in the string between masses m$_2$ and m$_3$?

asked Aug 20, 2014 by balaji.thirumalai

1 answer

Consider the following Atwood machine with three masses in the ratio m$_1$: m$_2$: m$_3$:: 1:2:3, hung with a massless string over a friction-less pulley. What is the common acceleration of the system?

asked Aug 20, 2014 by balaji.thirumalai

1 answer

Two blocks (m$_1$) and (m$_1$), where m$_1 \gt\;$ m$_2$ are connected as shown on frictionless surface. Find the common acceleration of the masses, ignoring any friction effects.

asked Aug 20, 2014 by balaji.thirumalai

1 answer

The device shown here is called an Atwood's machine. m$_1$ and m$_2$ are suspended at the ends of a string of negligible mass passing over a friction-less pulley as shown here. What is the acceleration in the light cord that connects the two masses if $\;m_1 = 2 m_2$?

asked Aug 20, 2014 by balaji.thirumalai

1 answer

A 5-kg block (m$_1$) and 2-kg block (m$_2$) are connected as shown on frictionless surface. Find the tension in the rope connecting the two blocks. Ignore any friction effects.

asked Aug 19, 2014 by balaji.thirumalai

1 answer

A cord passing over a frictionless, massless pulley (Atwood's machine) has a $m_2 =$ 10-kg block tied to one end and a $m_1 =$ 12-kg block tied to the other. If at the end of 3 seconds the string is cut, find the distances moved by the masses $d_1$ and $d_2$ in the next 6 seconds.

asked Aug 19, 2014 by balaji.thirumalai

1 answer

The device shown here is called an Atwood's machine. m$_1$ and m$_2$ are suspended at the ends of a string of negligible mass passing over a friction-less pulley as shown here. What is the tension in the light cord that connects the two masses?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

The system on the left shown here is called an Atwood's machine. m$_1$ and m$_2$ are suspended at the ends of a string of negligible mass passing over a friction-less pulley as shown here. The system on the right just has a hanging mass m. What should m be in terms of m$_1$ and m$_2$ so that the tension in the top string is the same in both cases? Assume that the two systems have equal downward acceleration (a').

asked Aug 19, 2014 by balaji.thirumalai

1 answer

The device shown here is called an Atwood's machine. m$_1$ and m$_2$ are suspended at the ends of a string of negligible mass passing over a friction-less pulley as shown here. How far will m$_1$ fall in time $t$ after the system is released?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

The device shown here is called an Atwood's machine. m$_1$ and m$_2$ are suspended at the ends of a string of negligible mass passing over a friction-less pulley as shown here. What is the acceleration and the tension in the light cord that connects the two masses if m$_1$ = 12 kg and m$_2$ = 4 kg?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

Raju drops a pile of marbles from the top of a roof located $8.52\;m$ above the ground. Determine the time required for the marbles to reach the ground .

asked Aug 19, 2014 by meena.p

1 answer

What is the normal force on the object of mass m$_1$ (20 kg) shown in the diagram? What is the acceleration of the object?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

You are thrown from a bicycle and skid in a straight line to a complete stop on a rough road at t a distance of 3.5 m along a straight line. What average force did the road exert on your body if your mass is 70 kg and your initial speed was 30 km/h?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

A crate with mass 32.5 kg initially at rest on a warehouse floor is acted on by a net horizontal force of 140 N. How far does the crate travel in 10.05 s?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

From the top of a building 40 m tall, a ball a thrown vertically upwards with a velocity of $10\; ms^{-1}$ After how long will the ball hit the ground?

asked Aug 19, 2014 by meena.p

2 answers

If a net horizontal force of 130 N is applied to a person with mass 60 kg who is resting on the edge of a swimming pool, what is the horizontal acceleration produced?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

Consider a block of mass 5 kg on a table top initially at rest. Assume that the surface is frictionless. Let a pushing force of 50 N directed at an angle of 30$^\circ$ below the horizontal act on the block. Find the acceleration of the block and the normal force that the table exerts on the block.

asked Aug 19, 2014 by balaji.thirumalai

1 answer

A body moving in a straight line covers a distance of $14 m $ in the 5th second and 20 m in the 8th second. How much distance will it cover in the 15th second ?

asked Aug 19, 2014 by meena.p

1 answer

Consider a box of mass 10 kg being lifted upward by a person standing on the surface of the earth. At a given instant the box is being accelerated upwards with an acceleration of size 5 m/s$^2$. Find the force that the person exerts on the box at this instant.

asked Aug 19, 2014 by balaji.thirumalai

1 answer

A marble rolls across a flat surface. Its initial speed is 41 m/s but it comes to rest after 10 seconds . Find the acceleration of the marble and the distance traveled by the marble as it comes to rest.

asked Aug 19, 2014 by meena.p

1 answer

Imagine you are standing on a cardboard box that is only just strong enough to support your weight. What would happen to it if you tried to jump into the air? The cardboard box would

asked Aug 19, 2014 by balaji.thirumalai

1 answer

An object experiences an acceleration of magnitude $3.75 m/s^2$. Calculat the mass of the object given there are three forces acting on an object as follows:

asked Aug 19, 2014 by balaji.thirumalai

1 answer

A force applied to an object of mass $\text{m1}$ produces an acceleration of 3.00 ms$^{-2}$. The same force applied to a second object of mass $\text{m2}$ produces an acceleration of 1.00 ms$^{-2}$. If the two masses are combined into one object, what is the acceleration under the action of the force?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

A force applied to an object of mass $\text{m1}$ produces an acceleration of 3.00 ms$^{-2}$. The same force applied to a second object of mass $\text{m2}$ produces an acceleration of 1.00 ms$^{-2}$. What is the value of the ratio $\large\frac{\text{m1}}{\text{m2}}$?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

A car acceleration from rest at a constant rate $\alpha$ for some time after which it decelerates at a constant rate $\beta$ to come to rest. If t is the total time elapsed , then the maximum velocity attained by the car is

asked Aug 19, 2014 by meena.p

1 answer

What are the missing forces on this Free Body Diagram?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

An electron starting from rest has a velocity that increases linearly with time i.e $v= kt$ where $k=2\;m\;s^{-2}$. The distance covered in the first 3 second is

asked Aug 19, 2014 by meena.p

1 answer

What is the missing force on this Free Body Diagram?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

If the forces acting upon an object are balanced, then the object

asked Aug 19, 2014 by balaji.thirumalai

1 answer

A 2-kg object is moving horizontally with a speed of 8 m/s. How much net force is required to keep the object moving at this speed and in this direction?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

A steel ball is bouncing up and down on a steel plate with a period of oscillation of 1 second. If $g= 10\;ms^{-2}$, then if bounces up to a height of

asked Aug 19, 2014 by meena.p

1 answer

Let an object be at rest initially and you push it with constant force across a friction-less surface for a time internal $\Delta t$ resulting in a final speed of $v$ for the object. Now, if you repeat the experiment with a force that is twice as large, what will be the time internal needed to reach the same final speed $v$?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

Consider a car moving west along a highway with a constant velocity of 65 km per hour. What happens when the driver takes his foot off the accelerator pedal?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

Suppose we are standing in a stationary bus and the driver starts the bus suddenly. Which of the following is correct?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

An astronaut accidentally gets separated out of his small spaceship accelerating in inter stellar space at a constant rate of 100 m s$^{-2}$. What is the acceleration of the astronaut the instant after he is outside the spaceship assuming there are no nearby stars to exert gravitational force on him?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

Consider a cart on a horizontal friction-less surface. Once the cart has been given a push and released, it moves with constant velocity. What would have to be done in order to have the cart continue with constant acceleration?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

Consider a cart on a horizontal friction-less surface. Once the cart has been given a push and released, what will happen to the cart?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

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