Recent questions in Physics

is position vector a localized vector?

asked Apr 21, 2015 by johnsenjohnsen0

0 answers

how to represent a vector?

asked Apr 20, 2015 by johnsenjohnsen0

1 answer

The type of isomerism found in vrea molecule is

asked Apr 15, 2015 by meena.p

1 answer

A string wrapped around a solid cylinder of mass M and radius R. The string is pulled vertically upward to prevent the centre of mass of the cylinder from falling as the cylinder unwinds the string. Choose the correct options: (A). the tension in the string is 2Mg (B). the length of the string unwound until its angular velocity becomes w is w^2R^2/2g (C).the angular acceleration of the cylinder is 2g/3R (D).work done by tension on the cylinder until its angular velocity becomes w is 1/4Mw^2R^2

asked Mar 27, 2015 by agarwal795

0 answers

Consider a mass m attached to a string of length l performing vertical circle.find an expression for velocity at any point and tension at any point .

asked Mar 5, 2015 by venkatesh.purushotham

1 answer

A body is strained within elastic limits .Show that work done , in the process is 1/2 x stress x strain .

asked Mar 5, 2015 by venkatesh.purushotham

1 answer

find out the value of d as shown in fig.

asked Dec 12, 2014 by vishavjeetmor

1 answer

question gave coefficient of friction to be " k " for both the blocks but if put k1=k2=k then F=0 how is this possible?

asked Dec 1, 2014 by harsha.wardan7

1 answer

a particle has initial velocity V=3i +4j and a constant force F = 4i-3j acts on the particle .prove that path of particle is parabolic.[where i,j represent unit vectors along x and y axis]

asked Nov 29, 2014 by harsha.wardan7

1 answer

two blocks m and M tied together with an inextensible string are at rest on rough horizontal surface with coefficient of friction " k ". the block m i pulled with a variable force F with a variable angle 'x' with the horizontal .the value of 'x' for which the least value of F is required to move the blocks given by

asked Nov 27, 2014 by harsha.wardan7

1 answer

A 60kg man stands on a spring scale in a lift.at some instant,he finds that the scale reading has changed from 60kg to 50kg for a while and then comes back to original mark.what should be concluded?

asked Nov 27, 2014 by harsha.wardan7

1 answer

A small marble is projected with a velocity of 10m/s in a direction 45 degrees from the horizontal y-direction on the smooth inclined plane . calculate magnitude of velocity after 2s?

asked Nov 27, 2014 by harsha.wardan7

1 answer

Velocity and acceleration transformation: A horizontal bar rotates with the constant angular velocity ω about a vertical axis which is fixed to a table and passes through one of the ends of that bar. A small coupling moves along the bar. Its velocity relative to the bar obeys the law v' = ar where a is a constant and r is the radius vector determining the distance between the coupling and the rotation axis. Find: (1) the velocity v and the acceleration α of the coupling relative to the table and depending on r; (2) the angle between the vectors v and α in the process of motion

asked Sep 20, 2014 by vishavjeetmor

1 answer

A spring whose natural length is 15 cm exerts a force of 45 N when stretched to a length of 20 cm.Find the work done in stretching the spring from a length of 20 cm to a length of 25 cm

asked Sep 2, 2014 by sreemathi.v

1 answer

A force of 1200 N compresses a spring from its natural length of 18 cm to a length of 16 cm. How much work is done in compressing it from 16 cm to 14 cm?

asked Sep 2, 2014 by sreemathi.v

1 answer

A spring is stretched 60 cm, and it takes a force of 40 Newtons to hold it there. How much work did it take to stretch the spring to this point?

asked Sep 2, 2014 by sreemathi.v

1 answer

A wall is tilted in by $15^{\large\circ}$,and a 2kg block is placed against the wall.The block is held in place with a spring.The coefficients of friction between the block and the wall are $\mu_s=0.61$ and $\mu_k=0.49$.Holding the block in place requires that the spring be compressed by 12cm.What is the spring constant of the spring?

asked Sep 2, 2014 by sreemathi.v

1 answer

It takes 100J of work to stretch a spring 0.5m from its equilibrium position.How much work is needed to stretch it an additional 0.75m?

asked Sep 2, 2014 by sreemathi.v

1 answer

A force of 6 N is required to stretch a string from a natural length of 4 m to a length of 4.5 m.What work is required to stretch it to a length of 6 m.

asked Sep 2, 2014 by sreemathi.v

1 answer

Suppose 2 J of work is needed to stretch a spring from its natural length of 30 cm to a length of 42 cm.Then how far beyond its natural length will a force of 30 N keep the spring stretched?

asked Sep 2, 2014 by sreemathi.v

1 answer