Recent questions tagged class11

What is the missing force on this Free Body Diagram?

asked Aug 19, 2014 by balaji.thirumalai

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

asked Aug 19, 2014 by balaji.thirumalai

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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

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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

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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

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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

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Which of the following statements is MOST correct?

asked Aug 19, 2014 by balaji.thirumalai

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You kick a smooth flat stone out on a frozen pond. The stone slides, slows down, and eventually stops. This is because:

asked Aug 19, 2014 by balaji.thirumalai

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You put your book on the bus seat next to you. When the bus suddenly stops, the book slides forward off the seat. Why?

asked Aug 19, 2014 by balaji.thirumalai

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A hockey puck slides on ice at constant velocity. What is the net force acting on the puck?

asked Aug 19, 2014 by balaji.thirumalai

1 answer

A book is lying at rest on a table. The book will remain there at rest because

asked Aug 19, 2014 by balaji.thirumalai

1 answer

A body travelling with uniform acceleration crosses two points A and B with velocities $20\;ms^{-1}$ and $30 \;ms^{-1}$ respectively . The speed of the body at the mid-point of A and B is

asked Aug 19, 2014 by meena.p

1 answer

A bus starts from rest with an acceleration of $ 1\;ms^{-2}$ A man who is $48\;m$ behind the bus starts with a uniform velocity of $ 10\;ms^{-1}$. The minimum time after which the man will catch the bus is

asked Aug 19, 2014 by meena.p

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A stone is allowed to fall from the top of tower 100 metre high and at the same time another stone is projected vertically upwards from the ground with a velocity of $25\;ms^{-1} $. The two stones will meets after

asked Aug 19, 2014 by meena.p

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The displacement x of a particle at the instant when its velocity is v is given by $ v = \sqrt {3x+16}$ . Its acceleration and initial velocity are

asked Aug 19, 2014 by meena.p

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The distance through which a body falls in the nth seconds is h. The distance through which it falls in the next seconds is

asked Aug 19, 2014 by meena.p

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Write the statement "It is necessary to have a password to log on to the server." in the form if $p$ then $q$.

asked Aug 16, 2014 by rvidyagovindarajan_1

1 answer

Write the converse and contra positive of the statement "If it is hot outside then you feel thirsty."

asked Aug 16, 2014 by rvidyagovindarajan_1

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Write the converse and contra positive of the statement "I go to the beach whenever it is sunny day."

asked Aug 16, 2014 by rvidyagovindarajan_1

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Write the converse and contra positive of the statement "A positive integer is prime only if it has no divisors other than 1 and itself."

asked Aug 14, 2014 by rvidyagovindarajan_1

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A stone is thrown upwards with velocity v. At half the height, its velocity is

asked Aug 14, 2014 by meena.p

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A ball is thrown vertically upwards from the top of a tower of height h with velocity v. The ball strikes the ground after

asked Aug 14, 2014 by meena.p

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$\begin{array}{1 1}\text{Given the following 2 statements ,which of the following choices is correct?}\\\text{Statement-1: In a uniform circular motion,the acceleration is always directed towards the centre of the circle.}\\\text{Statement-2: Otherwise the speed of the body moving along the circle will change with time}\end{array}$

asked Aug 14, 2014 by sreemathi.v

1 answer

Given the following 2 statements, which of the following choices is correct?

asked Aug 14, 2014 by sreemathi.v

1 answer

A small block slides without friction down an inclined plane starting from rest. Let $S_n$ be the distance travelled from time $t- n-1$ to $t=n$. Then $\large\frac{S_n}{S_{n_1}}$ is

asked Aug 14, 2014 by meena.p

1 answer

A car exhibits a constant acceleration of $0.300 m/s^2$ parallel to the roadway. The car passes over a rise in the roadway such that the top of the rise is shaped like a circle of radius $500\; m$. At the moment the car is at the top of the rise, its velocity vector is horizontal and has a magnitude of $6.00\; m/s$. What is the direction of the total acceleration vector for the car at this instant?

asked Aug 14, 2014 by sreemathi.v

1 answer

An object is moving around a circle of radius 1.5 meters at a constant velocity of 7 meters per second.The frequency of the motion,in revolutions per second,is

asked Aug 14, 2014 by sreemathi.v

1 answer

A car travelling on a straight road at $15.0$ meter per second accelerates uniformly to a speed of $21.0$ meters per second in $12.0 \;second$. The total distance traveled by the car in this $12.0 $ second time interval is

asked Aug 14, 2014 by meena.p

1 answer

A stereo turntable has a frequency of 33 revolutions per minute.A record of radius 15.25 centimeters is placed on the turnable and begins to rotate.The velocity of a point on the edge of the record is

asked Aug 14, 2014 by sreemathi.v

1 answer

A typical carnival ferris wheel has a radius of 9.0m and rotates 4.0 times per minute.What magnitude acceleration do the riders experience?

asked Aug 14, 2014 by sreemathi.v

1 answer

An astronaut standing on a platform on the Moon drops a hammer. If the hammer falls $6.0 $ meters vertically in $2.7 \;seconds$, what is its acceleration ?

asked Aug 14, 2014 by meena.p

1 answer

In 3 seconds,an object moving around a circle sweeps out an angle of 9 radians.If the radius of the circle is 0.5 meter,the centripetal acceleration of the object is

asked Aug 14, 2014 by sreemathi.v

1 answer

A dart is thrown at a target that is supported by a wooden backstop. It strikes the backstop with an initial velocity of $350\;m/s$ The dart comes to rest in $0.0050\;s$ What is the acceleration of the dart ?

asked Aug 14, 2014 by meena.p

1 answer

Rain is falling vertically with a speed of $4ms^{-1}$.A man riding a bicycle is travelling at a speed of $3ms^{-1}$ in the north to south direction.In order to protect himself from rain,the man should hold his umbrella at an angle $\theta$ given by

asked Aug 14, 2014 by sreemathi.v

1 answer

Two persons P and Q are standing 54m apart on a long horizontal belt moving with a speed of $4ms^{-1}$ in the direction from P to Q.Person P rolls a round stone towards person Q with speed of $9ms^{-1}$ with respect to the belt.The velocity of stone with respect to an observer on a stationary platform is

asked Aug 14, 2014 by sreemathi.v

1 answer

A sailboat acceleration uniformly from $6.0\;m/s$ to $ 8.0 [N]$ at a rate of $0.50\;m/s^2$. What distance does the boat travel ?

asked Aug 13, 2014 by meena.p

1 answer

A sports car approaches a highway on-ramp at a velocity of $20.0\;m/s $ . If the car accelerates at a rate of $3.2 \;m/s^2 $ for $5.0\;s$ , What is the displacement of the car ?

asked Aug 13, 2014 by meena.p

1 answer

A car is moving at a speed $50 \;km /h$ two seconds there it is moving at $60 \;km/h$ Calculate the acceleration of the car.

asked Aug 13, 2014 by meena.p

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A car starts from rest , moves with an acceleration $a$ and then decelerates at $b$ for some time to come to rest. If the total time taken is t, the maximum velocity is

asked Aug 13, 2014 by meena.p

1 answer

A car staring from rest acceleration at the rate $f$ through a distance $S$, then continues at constant speed for time $t$ and then decelerates at rate $\large\frac{f}{2}$ to come to rest. If the total distance covered is $15\;s$ , then

asked Aug 13, 2014 by meena.p

1 answer

A boat heading due north crosses a wide river with a speed of 10.0 km/h relative to the water. The water in the river has a uniform speed of 5.00 km/h due east relative to the Earth. Determine the velocity of the boat relative to an observer standing on either bank.

asked Aug 13, 2014 by sreemathi.v

1 answer

The operator of a boat wishes to cross a 5-kilometer-wide river that is flowing to the east at 10 meters per second.He wishes to reach the exact point on the opposite shore 15 minutes after starting.At what speed and in what direction should the boat travel?

asked Aug 13, 2014 by sreemathi.v

1 answer

A person is driving a car towards east at a speed of 80 km/hr. A train appears to move towards north with a velocity of $80\sqrt{3}$ km/hr to the person driving the car. Find the speed of the train as measured with respect to earth.

asked Aug 13, 2014 by sreemathi.v

1 answer

A boy is riding a cycle with a speed of $5\sqrt3$m/s towards east along a straight line.It starts raining with a speed of 15m/s in the vertical direction.What is the direction of rainfall as seen by the boy.

asked Aug 13, 2014 by sreemathi.v

1 answer

A large van has a velocity 30m/s at $20^{\large\circ}S$ of E in still air.A gust of wind of 20m/s due East relative to the Earth strikes the van.What is the resultant velocity of the van relative to the Earth,during the gust

asked Aug 13, 2014 by sreemathi.v

1 answer

The current in the river is 1.0m/s.A woman swims 300m down stream and then back to her starting point without stopping.If she can swim $2.0m/s$ is still water,determine the time required for the round trip.

asked Aug 13, 2014 by sreemathi.v

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