Recent questions in Class11

A block of mass m = 2kg is raised vertically upwards by means of a massless string through a distance of S=4m with a constant acceleration a=2.2ms$^{-2}$.Find the net work done on the block.

asked Aug 28, 2014 by sreemathi.v

1 answer

Suppose A box has a mass of $100\; kg$, and you have to move it up a ramp. The ramp has an angle of $23^{\circ}$. What is the force needed to get the box moving up the ramp if the coefficient of static friction is $0.20$?

asked Aug 28, 2014 by meena.p

1 answer

A horizontal force F pulls a 20kg box at a constant velocity along a horizontal floor.If the coefficient of friction between the box and the floor is 0.25,find the work done by force F in moving the box through a distance of 2m.

asked Aug 28, 2014 by sreemathi.v

1 answer

A man cleaning a floor pulls a vacuum cleaner with a force of magnitude F = 50.0 N at an angle of $30.0^{\large\circ}$ with the horizontal. Calculate the work done by the force on the vacuum cleaner as the vacuum cleaner is displaced 3 m to the right.

asked Aug 28, 2014 by sreemathi.v

1 answer

It is well known that a raindrop falls under the influence of the downward gravitational force and the opposing resistive force. The latter is known to be proportional to the speed of the drop but is otherwise undetermined. Consider a drop of mass 1.00 g falling from a height 1.00 km. It hits the ground with a speed of $50.0 m s^{-1}$.What is the work done by the unknown resistive force?

asked Aug 28, 2014 by sreemathi.v

1 answer

It is well known that a raindrop falls under the influence of the downward gravitational force and the opposing resistive force. The latter is known to be proportional to the speed of the drop but is otherwise undetermined. Consider a drop of mass 1.00 g falling from a height 1.00 km. It hits the ground with a speed of $50.0 m s^{-1}$.What is the work done by the gravitational force

asked Aug 28, 2014 by sreemathi.v

1 answer

A spherical ball of mass 20kg is stationary at the top of a hill of height 100m.It rolls down a smooth surface to the ground and then climbs up another hill of height 30m and finally rolls down to a horizontal base at a height of 20m above the ground.The velocity attained by the ball is

asked Aug 28, 2014 by sreemathi.v

1 answer

A right triangular wedge of mass M and inclination angle $\theta$ , supporting a small block of mass m on its side, rests on a horizontal frictionless table, as shown in figure. Assuming all surfaces are frictionless, What horizontal force F must be applied to the system to achieve this result?

asked Aug 28, 2014 by sreemathi.v

1 answer

Two blocks of masses $m_1=m$ and $m_2=2m$ are connected by a light string passing over a frictionless pulley.The mass $m_1$ is placed on a smooth inclined plane of inclination $\theta=30^{\large\circ}$ and mass $m_2$ hangs vertically as shown in figure below.If the system is released the tension in the string is

asked Aug 28, 2014 by sreemathi.v

1 answer

Two blocks of masses $m_1=m$ and $m_2=2m$ are connected by a light string passing over a frictionless pulley.The mass $m_1$ is placed on a smooth inclined plane of inclination $\theta=30^{\large\circ}$ and mass $m_2$ hangs vertically as shown in figure below.If the system is released,the blocks move with an acceleration equal to

asked Aug 28, 2014 by sreemathi.v

1 answer

A box can be moved up an inclined plane with constant velocity by a force of magnitude $F_1$ or down the inclined plane with constant velocity by a force of magnitude $F_2$ . Find the coefficient of kinetic friction $\mu_k$ between the box and the inclined plane. It holds that $F_1=6F_2$ and both forces are parallel with the inclined plane. The angle $\alpha$ between the inclined plane and the horizontal plane is $15^{\circ}$

asked Aug 27, 2014 by meena.p

1 answer

A 15 N force is applied to a $6.0\;kg$ block. Determine the acceleration of the block.

asked Aug 27, 2014 by meena.p

1 answer

A block of mass M is resting on an inclined plane as shown in figure below.The inclination of the plane to the horizontal is gradually increased.It is found that when the angle of inclination is $\theta$ the block just begins to the slide down the plane.What is the minimum force F applied parallel to the plane that would just make the block move up the plane?

asked Aug 27, 2014 by sreemathi.v

1 answer

Consider the diagram below showing the trajectory of an object thrown from Point 0. Which of the following is true?

asked Aug 27, 2014 by balaji.thirumalai

1 answer

Determine the rate of deceleration of $7.0 \;kg $ block sliding up an incline angled at $35^{\circ}$ to the horizontal. Assume that the coefficient of friction is $0.45$

asked Aug 27, 2014 by meena.p

1 answer

The upper half of an inclined plane of inclination $\theta$ is perfectly smooth while the lower half is rough.A block starting from rest at the top of the plane will again come to rest at the bottom if the coefficient of friction between the block and the lower half of the plane is given by

asked Aug 27, 2014 by sreemathi.v

1 answer

A block takes twice as much time to slide down a rough $45^{\large\circ}$ inclined plane as it takes to slide down an identical smooth $45^{\large\circ}$ inclined plane.The coefficient of kinetic friction between the block and the rough inclined plane is

asked Aug 27, 2014 by sreemathi.v

2 answers

A block is placed on the top of a smooth inclined plane of inclination $\theta$ kept on the floor of a lift.When the lift is descending with a retardation $a$,the block is released.The acceleration of the block relative to the incline is

asked Aug 27, 2014 by sreemathi.v

1 answer

A body of 5kg weight kept on a rough inclined plane of angle $30^{\large\circ}$ starts sliding with a constant velocity.Then the coefficient of friction is (assume $g=10m/s^2$)

asked Aug 27, 2014 by sreemathi.v

1 answer

A crate of mass m = 100kg is pushed at constant speed up a frictionless ramp $\theta=30^{\large\circ}$ by a horizontal force $\overrightarrow{F}$.What are the magnitudes of $\overrightarrow{F}$ and the force of the crate from the ramp?

asked Aug 27, 2014 by sreemathi.v

1 answer

Consider two identical blocks,one resting on a flat surface and the other resting on an incline.For which case is the normal force greater?

asked Aug 27, 2014 by sreemathi.v

1 answer

A block slides down a frictionless plane having an inclination of $\theta = 15.0^{\large\circ}$. The block starts from rest at the top, and the length of the incline is 2.00 m. Find its speed when it reaches the bottom of the incline

asked Aug 27, 2014 by sreemathi.v

1 answer

A $100-kg$ box is sliding down a frictional surface at a constant speed of $0.2\; m/s$ as shown. What is the value of $F_{norm}?$

asked Aug 27, 2014 by meena.p

1 answer

Calculate the magnitude of the normal force and the acceleration of the box in this experiment: Take a 10 kg box on a frictionless 30o inclined plane and release your hold, allowing the box to slide to the ground, a horizontal distance of d meters and a vertical distance of h meters as shown in the diagram below:

asked Aug 27, 2014 by sreemathi.v

1 answer

Determine the acceleration of a 12kg block sliding down a plane surface angled at $47^{\large\circ}$ to the horizontal.Assume that friction is negligible.

asked Aug 27, 2014 by sreemathi.v

1 answer

A tire weighing $2Kgs$ begins rolling down a steep hill (a $30^{\circ}$ incline) as shown. Determine the acceleration of the tire. Ignore resistance force.

asked Aug 27, 2014 by meena.p

1 answer

A little boy stands at the bottom of an inclined road and kicks a soccer ball. The ball rolls northward up the driveway and then rolls back to the ball. Which one of the following velocity-time graphs (A, B, C, or D) most accurately portrays the motion of the ball as it rolls up the driveway and back down?

asked Aug 27, 2014 by sreemathi.v

1 answer

A ball rolls off a flat surface on to a road that slopes downwards. Which one of the velocity-time graphs (A, B, C, or D) would be an appropriate representation of the ball's motion as it rolls across the horizontal surface and then down the incline? Consider frictional forces.

asked Aug 27, 2014 by meena.p

1 answer

A block is pushed up a frictionless inclined plane as shown below.Determine the magnitude of the horizontal force vector,F=|F|,that will keep the block sliding up the incline with a constant velocity :

asked Aug 27, 2014 by sreemathi.v

1 answer

A 1 kg mass on a frictionless inclined plane is connected by a pulley to a hanging 0.5kg mass,as in the diagram below.At what angle will the system be in equilibrium?

asked Aug 27, 2014 by sreemathi.v

1 answer

Three friends have a bet on the value of the normal force in this free body diagram for an inclined plane problem? Raj says its 500 N Ram says its 250 N and Rahul says that its 433 N. Who is correct?

asked Aug 26, 2014 by meena.p

1 answer

A block of mass M is resting on an inclined plane shown in fig. The inclination of the plane to the horizontal is gradually increased . It is found that when the angle of inclination is $\theta$ the block just begins to the slide down the plane. What is the minimum force F applied parallel to the plane that would just make the block move up the plane ?

asked Aug 26, 2014 by meena.p

1 answer

A particle of mass m is suspended from a ceiling through a string of length L. The particle moves in a horizontal circle of radius r. Find the speed of the particle.

asked Aug 26, 2014 by meena.p

1 answer

Suppose the designated speed for an exit ramp on a highway is to be $13.4\; m/s$ and the radius of the curve is $50.0\; m$. At what angle should the curve be banked? (i.e, the roadway is tilted towards inside of the curve).

asked Aug 26, 2014 by meena.p

1 answer

A 1.5 Kg car moving on a flat , horizontal road negotiates a curve. If the radius of the curve is 35 m and the coefficient of static friction between the tires and dry pavement is 0.5, find the maximum speed the car can have and still make the turn successfully.

asked Aug 26, 2014 by meena.p

1 answer

A ball of mass $0.500\;kg$ is attached to the end of a cord $1.50\;m$ long. The ball is whirled in a horizontal circle as shown in fig.If the cord can withstand a maximum tension of $50.0\;N$, What is the maximum speed at which the ball can be whirled before the cord breaks ? Assume that the string remains horizontal during the motion.

asked Aug 26, 2014 by meena.p

1 answer

Consider a block sliding down a frictionless inclined plane with acceleration a . If we double the mass of the block,what is its acceleration?

asked Aug 26, 2014 by sreemathi.v

1 answer

A position dependent force F = (10-2x +3x$^2$ ) N acts on a small object of mass 2 kg to displace it from x = 0 to x = 3m. The work done in Joules is

asked Aug 26, 2014 by balaji.thirumalai

1 answer

A Wheeled vehicle travels around a circular track of radius $50\;m$ The wheels are $2m$ apart(side ways) and the center of gravity is $0.8 m$ above the ground. The coefficient of friction is $0.4$ . Determine whether it overturns or slides sideways and determine the velocity at which it occurs ?

asked Aug 26, 2014 by meena.p

1 answer

A train rounds an unbanked circular bend of radius 50 m at a speed of $54\;km\;h^{-1}$. If $g= 10 \;m/s^{-2}$, the angle of banking required to prevent wearing out of rails is given by

asked Aug 26, 2014 by meena.p

1 answer

A train has to negotiate a curve of radius $200\;m$ . By how much should the outer rails be raised with respect to the inner rails for a speed of $36\;km\;h^{-1}$. The distance between the rails is $ 1.5\;m$ Take $g=10 \;m /s^2$

asked Aug 26, 2014 by meena.p

1 answer

A car moves at a speed of $36 \;km\;h^{-1}$ on a level road, The coefficient of fraction between the tyres and the road is $0.8 $. The car negotiates a curve of radius R. If $g =10 ms^2$ the car will skid (or slip) while negotiating the curve if value of R is

asked Aug 26, 2014 by meena.p

1 answer

A particle of mass m moves in a straight line with its velocity varying with distance travelled according to the equation $v=a\sqrt {x}$ , where a is a constant. What is the total work done by all the forces during a displacement from x = 0 to x = d?

asked Aug 25, 2014 by balaji.thirumalai

1 answer

A block of mass 1.6 kg is attached to a horizontal spring that has a force constant of $1.0 \times 10^3 N/m$. The spring is compressed 2.0 cm and is then released from rest. Calculate the speed of the block as it passes through the equilibrium position if a constant friction force of 4 N retards its motion from the moment it is released

asked Aug 25, 2014 by balaji.thirumalai

1 answer

A block of mass 1.6 kg is attached to a horizontal spring that has a force constant of $1.0 \times 10^3 N/m$. The spring is compressed 2.0 cm and is then released from rest. Calculate the speed of the block as it passes through the equilibrium position $x= 0$ if the surface is frictionless.

asked Aug 25, 2014 by balaji.thirumalai

1 answer

A 2 Kg wood block is on a level board and held against a spring of spring constant k=100 N/m which has been compressed .1 m. The block is released and pushed horizontally across the board. The coefficient of friction between the block and the board is $\mu_k = .2$. Find the velocity of the block just as it leaves the spring.

asked Aug 25, 2014 by balaji.thirumalai

1 answer

A spring with a spring constant of 250 N/m has a length of 0.5 meters at rest. What magnitude of force is needed to stretch the spring so that is 0.75 meters long?

asked Aug 25, 2014 by balaji.thirumalai

1 answer

A cyclist is moving with a speed of $6 ms^{-1} $, As he approaches a circular turn on the road of radius $120 \;m$ he applies brakes and reduces his speed at a constant rate of $ 0.4 \;ms^{-2} $. The magnitude of the net acceleration of the cyclist on the circular turn is

asked Aug 25, 2014 by meena.p

1 answer

A car of mass $750\;kg$ moves around a circular track of radius $50\;m$ with a speed of $10\;ms^{-1}$. What's the centripetal force on the car?

asked Aug 25, 2014 by meena.p

1 answer

A merry-go-round is turning at the rate of $10.0$ revolutions per minute. A $50.0\;kg$ youth is located $5.00 \;m$ from the axis of rotation . What is the centripetal force acting on him ?

asked Aug 25, 2014 by meena.p

1 answer

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