A driver takes 0.30 s to apply the brakes after he sees a need for it. This is called the reaction time of the driver. If he is driving a car at a speed of 54 km/h and the brakes cause a deceleration of 5.0m/s2, find the distance travelled by the car after he sees the need to put the brakes on ?

Anonymous User Physics 15 Apr, 2019 86 views

Two moving particles P and Q are 10 m apart at any instant. Velocity of P is 8 m/s at 30degree, from line joining the P and Q and velocity of Q is 6m/s at 30 degree.Calculate the angular velocity of P w.r.t. Q

Anonymous User Physics 15 Apr, 2019 1343 views

The force of repulsion between two point charges is F, when these are at a distance of 1 m. Now the point charges are replaced by spheres of radii 25 cm having the charge same as that of point charges. The distance between their centres is 1 m, then compare the force of repulsion in two cases.

Anonymous User Physics 13 Apr, 2019 1356 views

A particle of mass m carrying charge '+q1' is revolving around a fixed charge '–q2' in a circular path of radius r. Calculate the period of revolution.

Anonymous User Physics 13 Apr, 2019 480 views

If the distance between two equal point charges is doubled and their individual charges are also doubled, what would happen to the force between them?

Anonymous User Physics 13 Apr, 2019 129 views

What is the role of depressant in froth floatation process?

Anonymous User Chemistry 13 Apr, 2019 75 views

Copper can be extracted by hydrometallurgy but not zinc. Explain.

Anonymous User Chemistry 13 Apr, 2019 77 views

When a piece of polythene is rubbed with wool, a charge of – 2*10–7 C is developed on polythene. What is the amount of mass, which is transferred to polythene.

Anonymous User Physics 12 Apr, 2019 222 views

Can anybody help me here. Thanks!!

Niti Gupta Maths 12 Apr, 2019 69 views

A large number of particles are moving each with speed v having directions of motion randomly distributed. What is the average relative velocity between any two particles averaged over all the pairs?

Rahul Kumar Physics 12 Apr, 2019 400 views

A particle is moving along a straight line along x-axis with an initial velocity of 2 m/s towards positive x-axis. A constant acceleration of 0.5 m/s2 towards negative x-axis starts acting on particle at t=0. Find velocity (in m/s) of particle at t = 2s.

Rahul Kumar Physics 12 Apr, 2019 74 views

A body is thrown up with a speed 49 m/s. It travels 5 m in the last second of its upward journey. If the same body is thrown up with a velocity 98 m/s, how much distance (in m) will it travel in the last second. (g = 10 m/s2)?

Rahul Kumar Physics 12 Apr, 2019 208 views

Given f(x) = e (x 2 - x), find
a) the interval(s) of increase and decrease of f,
b) value(s) of x for which f has a local extremum,
c) the interval(s) of concavity and any inflection point(s).

Niti Gupta Maths 12 Apr, 2019 65 views

WHAT IS Zone refining METHOD/TECHNIQUE TO REFINE METAL

Anonymous User Chemistry 12 Apr, 2019 73 views

WHAT IS Electrolytic refining METHOD/TECHNIQUE TO REFINE METAL

Anonymous User Chemistry 12 Apr, 2019 76 views

## WHAT IS Liquation METHOD/TECHNIQUE TO REFINE METAL

Anonymous User Chemistry 12 Apr, 2019 63 views

What is Distillation method/technique to Refine Metal

Anonymous User Chemistry 12 Apr, 2019 79 views

A particle is projected vertically upwards the surface of the earth (radius Re) with a speed equal to one fourth of escape velocity. What is the maximum height attained by it from the surface of the earth ?

Anonymous User Physics 12 Apr, 2019 925 views

At a site, low grade copper ores are available and zinc and iron scraps are also available. Which of the two scraps would be more suitable for reducing the leached copper ore and why?

Anonymous User Chemistry 12 Apr, 2019 141 views

Why is the reduction of a metal oxide easier if the metal formed is in liquid state at the temperature of reduction?

Anonymous User Chemistry 12 Apr, 2019 97 views

Although thermodynamically feasible, in practice, magnesium metal is not used for the reduction of alumina in the metallurgy of aluminium. Why ?

Anonymous User Chemistry 12 Apr, 2019 273 views

Suggest a condition under which magnesium could reduce alumina

Anonymous User Chemistry 12 Apr, 2019 202 views

what is Limitations of Ellingham Diagram

Anonymous User Chemistry 12 Apr, 2019 155 views

EXPLAIN Froth Floatation Method FOR CONCENTRATION OF ORES .

Anonymous User Chemistry 12 Apr, 2019 65 views

EXPLAIN Magnetic Separation PROCESS FOR CONCENTRATION OF ORES .

Anonymous User Chemistry 12 Apr, 2019 69 views

Explain Hydraulic Washing process for Concentration of Ores .

Anonymous User Chemistry 12 Apr, 2019 73 views

What is the Concentration of Ores of Ores

Anonymous User Chemistry 12 Apr, 2019 66 views

SOne please let me know the Principal Ores of Some Important Metals

Anonymous User Chemistry 12 Apr, 2019 66 views

A solid sphere of mass M and radius R is surrounded by a spherical shell of same mass M and radius 2R as shown. A small particle of mass m is released from rest from a height h (<<R) above the shell. There is a hole in the shell.

Devendra Yadav Physics 12 Apr, 2019 91 views

If the law of gravitation be such that the force of attraction between two particles vary inversely as the 5/2th power of their separation, then the graph of orbital velocity v0 plotted against the distance r of a satellite from the earth's centre on a log-log scale is shown alongside. The slope of line will be

Ashish Yadav Physics 12 Apr, 2019 154 views

What is the domain and range of the relation R given by

Geet Pal Maths 10 Apr, 2019 60 views

Let A = {1, 2, 3, 4} and B = {5, 7, 9}.

What is the value of

(i) A × B

(ii) B × A

(iii) Is A × B = B × A ?

(iv) Is n (A × B) = n (B × A) ?

Geet Pal Maths 10 Apr, 2019 66 views

An open glass tube is immersed in mercury in such a way that a length of 8 cm extends above the mercury level. The open end of the tube is then closed and sealed and the tube is raised vertically up by additional 46 cm. What will be length of the air column above mercury in the tube now?

Anonymous User Physics 10 Apr, 2019 133 views

What are the four stages of binary fission in amoeba?

Anonymous User Biology 10 Apr, 2019 77 views

Rita performs two set of experiments to study the length of the foam formed which are as follows:
Set I: she takes 10 ml of distilled water in test tube “A” and adds 5-6 drops of liquid soap in it and shakes the test tube vigorously.
Set II: she takes 10 ml of distilled water in a test tube “A” and adds 5-6 drops of liquid soap with half spoonful of CaSO 4 in it and shakes the test tube. Write your observation and reason

Anonymous User Biology 10 Apr, 2019 71 views

What do you observe when you drop a few drops of acetic acid to a test tube containing:

(a) Phenolphthalein
(b) Distilled water
(c) Universal indicator
(d) Sodium hydrogen carbonate

Anonymous User Biology 10 Apr, 2019 125 views

Define phytohormones and Give two functions of each: (i) Auxin (ii) Gibberellins (iii) Abscissic acid (iv) Ethylene

Anonymous User Biology 10 Apr, 2019 81 views

Why It is more difficult to walk on ice than on a concrete road ?

Anonymous User Physics 10 Apr, 2019 85 views

Can some one please let me know in which galaxy the earth is located?

Anonymous User Physics 10 Apr, 2019 79 views

A box of mass m is initially at rest on a horizontal surface. A constant horizontal force of mg/2 is applied to the box directed to the right. The coefficient of friction of the surface changes with the distance pushed as µ = µ0x where x is the distance from the initial location. For what distance is the box pushed until it comes to rest again?

Anonymous User Physics 09 Apr, 2019 153 views

A pendulum bob of mass m is suspended at rest. A cosntant horiozntal force F = mg/2 starts acting on it. The maximum angular deflection of the string is?

Sahil Physics 07 Apr, 2019 1462 views