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 ?

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

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.

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.

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?

What is the role of depressant in froth floatation process?

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

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.

Can anybody help me here. Thanks!!

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?

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.

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)?

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).

WHAT IS Zone refining METHOD/TECHNIQUE TO REFINE METAL

WHAT IS Electrolytic refining METHOD/TECHNIQUE TO REFINE METAL

## WHAT IS Liquation METHOD/TECHNIQUE TO REFINE METAL

What is Distillation method/technique to Refine Metal

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 ?

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?

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

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

Suggest a condition under which magnesium could reduce alumina

what is Limitations of Ellingham Diagram

Explain Ellingham Diagram

EXPLAIN Froth Floatation Method FOR CONCENTRATION OF ORES .

EXPLAIN Magnetic Separation PROCESS FOR CONCENTRATION OF ORES .

Explain Hydraulic Washing process for Concentration of Ores .

What is the Concentration of Ores of Ores

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

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.

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

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?

What are the four stages of binary fission in amoeba?

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

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

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

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

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

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?