Recent questions tagged unit2

A body is projected vertically upward with a velocity $20 ms^{-1}$ . Find the distance travelled by it in 3 s. Take $g=10ms^{-2}$.

asked Jul 25, 2014 by meena.p

1 answer

A particle is projected vertically up and it reaches a 15 cm high mark at certain instant. After 4 seconds from this instant the particle crosses this mark again in its downward journey. What is the initial velocity of projection of this particle? $(g= 10 ms^{-2})$

asked Jul 25, 2014 by meena.p

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A body travels 2 m in the first two seconds and $2.2 \;m$ in the next four seconds. What will be its velocity at the end of the seventh second from the start, if acceleration is constant .

asked Jul 18, 2014 by meena.p

1 answer

A Car is able to stop with a uniform retardation of $8 ms^{-2} $ and the driver of the car can react to an emergency in 0.6 s. Calculate overall stopping distance of the car if the speed of car is $72 \;km\;h^{-1}$

asked Jul 18, 2014 by meena.p

1 answer

Straight from rest and moving with a constant acceleration , a body covers certains distance L in time t. What is the time taken by the body to cover the second half portion of this journey ?

asked Jul 18, 2014 by meena.p

1 answer

Telegraphic poles along a straight railway track are spaced at regular intervals of $90\;m$. A passenger in the train observes the successive pole pass at time intervals of 3 and 2 seconds respectively , find the acceleration of the train assuming it to be uniform .

asked Jul 18, 2014 by meena.p

1 answer

A train travels first one third of the distance on a straight track with velocity$10km h^{-1}$ next one third with velocity $20 kmh^{-1}$ and the last portion with velocity $60 kmh^{-1}$. What is the average velocity of the train for the whole journey ?

asked Jul 18, 2014 by meena.p

1 answer

If a ball is thrown vertically upwards with speed u, the distance covered during the last t second of its ascent is

asked Jul 18, 2014 by meena.p

1 answer

A particle is dropped vertically from rest from a certain height. Time taken by it to fall through successive distance of one metre each will be :

asked Jul 18, 2014 by meena.p

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A stone is thrown vertically up from the top of a tower with some initial velocity and it arrives on the ground after $t_1$ seconds. Now if the same the stone is thrown vertically down from the top of the same tower with the same initial velocity, it arrives on ground after $t_2$ seconds. In how much time will the stone take to reach the ground if it is dropped from the same tower?

asked Jul 17, 2014 by meena.p

1 answer

A particle is projected vertically upwards . It attains a height h after 2 seconds and again after 10 seconds . The speed of the particle at the height h is numerically equal to

asked Jul 17, 2014 by meena.p

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A body is projected vertically upwards. If $ t_1$ and $t_2$ be the times at which it is at height h above the point of projection while ascending and descending respectively. then h is,

asked Jul 17, 2014 by meena.p

1 answer

If the speed of a truck is reduced to one third of its original value, the minimum distance required to stop will be

asked Jul 17, 2014 by meena.p

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The greatest acceleration or deceleration that a train may have is $\alpha$ .The minimum time in which the train can get from one station to the next at a distance S is

asked Jul 10, 2014 by meena.p

1 answer

The front point of a train moving with constant acceleration crosses a signal post with velocity u and the end point of the train crosses the signal post with velocity v. With what velocity the middle point of the train crosses the signal post ?

asked Jul 10, 2014 by meena.p

1 answer

A car travels along straight road for the first half-time with a velocity $v_1$ and the second half-time with velocity $v_2$ The average velocity of cars is

asked Jul 10, 2014 by meena.p

1 answer

Assertion: Unit of nervous tissue is neuron.<br> Reason: The nerve tissue is developed from ectoderm.

asked May 7, 2014 by sreemathi.v

1 answer

Assertion: Cells organize themselves in the form of tissues.<br> Reason: Sugar recognition sites of neighboring cells bind each other causing to cell adhesion.

asked May 7, 2014 by sreemathi.v

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Assertion: Connective tissue contains a large amount of non living intercellular or extracellular matrix.<br> Reason: Intercellular substance is usually made up of protein fibres.

asked May 7, 2014 by sreemathi.v

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Beside calcium phosphate the bones contain

asked May 7, 2014 by sreemathi.v

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Bone forming cells are

asked May 7, 2014 by sreemathi.v

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The major constituent of vertebrate bone is

asked May 7, 2014 by sreemathi.v

1 answer

The strongest cartilage is

asked May 7, 2014 by sreemathi.v

2 answers

Cartilage is produced by

asked May 7, 2014 by sreemathi.v

1 answer

The process of formation of blood corpuscles is known as

asked May 7, 2014 by sreemathi.v

1 answer

Grafting is not possible in monocot stems because they

asked May 7, 2014 by sreemathi.v

1 answer

Tyloses are

asked May 7, 2014 by sreemathi.v

1 answer

When tree grows older,what increases rapidly in thickness

asked May 7, 2014 by sreemathi.v

1 answer