## A shell is fired at a speed of 200 m/s at an angle of 37° above horizontal from top of a tower 80m high. At the same instant another shell was fired from a jeep travelling away from the tower at a speed of 10 m/s as shown. The velocity of this shell relative to jeep is 250 m/s at an angle of 53° with horizontal. Find the time (in sec) taken by the two shells to come closest? A shell is fired at a speed of 200 m/s at an angle of 37° above horizontal from top of a tower 80m high. At the same instant another shell was fired from a jeep travelling away from the tower at a speed of 10 m/s as shown. The velocity of this shell relative to jeep is 250 m/s at an angle of 53° with horizontal. Find the time (in sec) taken by the two shells to come closest.

Anonymous User tag : Physics 04 May, 2019 80 views

## Four charges q, 2q, –4q and 2q are placed in order at the four corners of a square of side b. The net field at the centre of square is? Four charges q, 2q, –4q and 2q are placed in order at the four corners of a square of side b. The net field at the centre of square is?

Anonymous User tag : Physics 04 May, 2019 119 views

## a elastic spring is compressed b/w 2 block of masses 1 and 2 kg resting on smooth horizontal table if spring has 12 j of energy and suddenly released the velocity with which 2 kg moves with a elastic spring is compressed b/w 2 block of masses 1 and 2 kg resting on smooth horizontal table if spring has 12 j of energy and suddenly released the velocity with which 2 kg moves with

Anonymous User tag : Physics 04 May, 2019 72 views

## Find the equation of the hyperbola whose directrix is 2x + y = 1, focus (1, 2) and eccentricity is root 3? Find the equation of the hyperbola whose directrix is 2x + y = 1, focus (1, 2) and eccentricity Anonymous User tag : Maths 03 May, 2019 137 views

## if soap sol has surface tension t and a bubble of diameter d blown through it then work done to blow bubble if soap sol has surface tension t and a bubble of diameter d blown through it then work done to blow bubble

Anonymous User tag : Physics 03 May, 2019 77 views

## work a body freely falls from certain height onto ground in time t during first 1/3rd of time interval it gains ake1 and during last 1/3 rd of intervalit gains ke2 the ratio of ke1/ke2 is

Anonymous User tag : Physics 02 May, 2019 75 views

## WHat is Osmosis and Osmotic Pressure ?

WHat is Osmosis and Osmotic Pressure ?

Rajkumar Yadav tag : Chemistry 01 May, 2019 58 views

## 1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. The freezing point depression constant of benzene is 5.12 K kg mol–1. Find the molar mass of the solute

1.00 g of a non-electrolyte solute dissolved in 50 g of benzene lowered the freezing point of benzene by 0.40 K. The freezing point depression constant of benzene is 5.12 K kg mol–1. Find the molar mass of the solute

Rajkumar Yadav tag : Chemistry 01 May, 2019 109 views

## 45 g of ethylene glycol (C2H6O2) is mixed with 600 g of water. Calculate (a) the freezing point depression and (b) the freezing point of the solution

45 g of ethylene glycol (C2H6O2) is mixed with 600 g of water. Calculate (a) the freezing point depression and (b) the freezing point of the solution

Rajkumar Yadav tag : Chemistry 01 May, 2019 98 views

## The boiling point of benzene is 353.23 K. When 1.80 g of a non-volatile solute was dissolved in 90 g of benzene, the boiling point is raised to 354.11 K. Calculate the molar mass of the solute. Kb for benzene is 2.53 K kg mol–1

The boiling point of benzene is 353.23 K. When 1.80 g of a non-volatile solute was dissolved in 90 g of benzene, the boiling point is raised to 354.11 K. Calculate the molar mass of the solute. Kb for benzene is 2.53 K kg mol–1

Rajkumar Yadav tag : Chemistry 01 May, 2019 113 views

## The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (molar mass 78 g mol-1). Vapour pressure of the solution, then, is 0.845 bar. What is the molar mass of the solid substance? The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (molar mass 78 g mol-1). Vapour pressure of the solution,
then, is 0.845 bar. What is the molar mass of the solid substance?

Anonymous User tag : Chemistry 01 May, 2019 156 views

## What is Non-ideal Solutions? What is Non-ideal Solutions?

Anonymous User tag : Chemistry 01 May, 2019 51 views

## WHat is Ideal Solutions ? WHat is Ideal Solutions ?

Anonymous User tag : Chemistry 01 May, 2019 52 views

## Please explain Raoult’s Law as a special case of Henry’s Law.. Please explain Raoult’s Law as a special case of Henry’s Law ..

Anonymous User tag : Chemistry 01 May, 2019 52 views

## Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 298 K are 200 mm Hg and 415 mm Hg respectively. (i) Calculate the vapour pressure of the solution prepared by mixing 25.5 g of CHCl3 and 40 g of CH2Cl2 at 298 K and, (ii) mole fractions of each component in vapour phase. Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 298 K are 200 mm Hg and 415 mm Hg respectively. (i) Calculate the vapour pressure of the solution prepared by mixing 25.5 g of CHCl3 and 40 g of H2Cl2 at 298 K and, (ii) mole fractions of each component in vapour phase.

Anonymous User tag : Chemistry 01 May, 2019 2034 views

## What is Raoult’s law ? What is Raoult’s law ?

Anonymous User tag : Chemistry 01 May, 2019 51 views

## What is Effect of Temperature on Solubility? What is Effect of Temperature on Solubility?

Anonymous User tag : Chemistry 01 May, 2019 52 views

## Explain the  Biological phenomena  of Henry’s law Explain the  Biological phenomena  of Henry’s law

Anonymous User tag : Chemistry 01 May, 2019 52 views

## If N2 gas is bubbled through water at 293 K, how many millimoles of N2 gas would dissolve in 1 litre of water. Assume that N2 exerts a partial pressure of 0.987 bar. Given that Henry’s law constant for N2 at 293 K is 76.48 kbar. If N2 gas is bubbled through water at 293 K, how many millimoles of N2 gas would dissolve in 1 litre of water. Assume that N2 exerts a partial pressure of 0.987 bar. Given that Henry’s law constant for N2 at 293 K is
76.48 kbar.

Anonymous User tag : Chemistry 01 May, 2019 1372 views

## A box contains 5 different red and 6 different white balls. In how many ways can 6 balls be drawn so that there are at least two balls of each colour ?

A box contains 5 different red and 6 different white balls. In how many ways can 6 balls be drawn so that there are at least two balls of each colour ?

abhay tag : Maths 30 Apr, 2019 65 views

## A college offers 6 courses in the morning and 4 in the evening. The number of ways a student can select exactly one course, either in the morning or in the evening? A college offers 6 courses in the morning and 4 in the evening. The number of ways a student can select exactly one course, either in the morning or in the evening?

Anonymous User tag : Maths 30 Apr, 2019 179 views

## A college offers 6 courses in the morning and 4 in the evening. The possible number of choices with the student if he wants to study one course in the morning and one in the evening is? A college offers 6 courses in the morning and 4 in the evening. The possible number of choices with the student if he wants to study one course in the morning and one in the evening is?

Anonymous User tag : Maths 30 Apr, 2019 66 views

## law of motion a mass of 3kg descending vertically downward supports a mass 2 kg by means of light string passing over a pulley at end of 5 sec the string breaks how much higher 2kg mass will go

Anonymous User tag : Physics 30 Apr, 2019 101 views

## Given two events A and B. If odds against A are as 2 : 1 and those in favour of A  B are as 3 : 1, then find the range of P(B)? Given two events A and B. If odds against A are as 2 : 1 and those in favour of A  B are as 3 : 1, then find the range of P(B)?

Anonymous User tag : Maths 28 Apr, 2019 72 views

## Three vertices out of six vertices of a regular hexagon are chosen randomly. The probability of getting a equilateral triangle after joining three vertices is ? Three vertices out of six vertices of a regular hexagon are chosen randomly. The probability of getting a equilateral triangle after joining three vertices is ?

Anonymous User tag : Maths 28 Apr, 2019 66 views

## If four cards are drawn at random from a pack of fifty-two playing cards, find the probability that at least one of them is an ace? If four cards are drawn at random from a pack of fifty-two playing cards, find the probability that at least one of them is an ace?

Anonymous User tag : Maths 28 Apr, 2019 63 views

## From a group of 10 persons consisting of 5 lawyers, 3 doctors and 2 engineers, four persons are selected at random. The probability that the selection contains at least one of each category is? From a group of 10 persons consisting of 5 lawyers, 3 doctors and 2 engineers, four persons are selected at random. The probability that the selection contains at least one of each category is?

Anonymous User tag : Maths 28 Apr, 2019 72 views

## If the letters of INTERMEDIATE are arranged, then the odds in favour of the event that no two 'E's occur together, are ? If the letters of INTERMEDIATE are arranged, then the odds in favour of the event that no two 'E's occur together, are ?

Anonymous User tag : Maths 28 Apr, 2019 81 views

## A bag contains 5 red and 4 green balls. Four balls are drawn at random, then find the probability that two balls are of red and two balls are of green colour? A bag contains 5 red and 4 green balls. Four balls are drawn at random, then find the probability that two balls are of red and two balls are of green colour?

Anonymous User tag : Maths 28 Apr, 2019 69 views

## Words are formed with the letters of the word PEACE. Find the probability that 2 E’s come together? Words are formed with the letters of the word PEACE. Find the probability that 2 E’s come together?

Anonymous User tag : Maths 28 Apr, 2019 127 views

## A coin is tossed successively three times. Find the probability of getting exactly one head or two heads? A coin is tossed successively three times. Find the probability of getting exactly one head or two heads?

Anonymous User tag : Maths 28 Apr, 2019 74 views

## A coin is tossed. If it shows head, we draw a ball from a bag consisting of 3 blue and 4 white balls; if it shows tail we throw a die. Describe the sample space of this experiment.? A coin is tossed. If it shows head, we draw a ball from a bag consisting of 3 blue and 4 white balls; if it shows tail we throw a die. Describe the sample space of this experiment.

Anonymous User tag : Maths 28 Apr, 2019 73 views

## In a uniform electric field, a cube of side 1 cm is placed. The total energy stored in the cube is 8.85μJ. The electric field is parallel to four of the faces of the cube. The electric flux through any one of the remaining two faces is. In a uniform electric field, a cube of side 1 cm is placed. The total energy stored in the cube is 8.85μJ. The electric field is parallel to four of the faces of the cube. The electric flux through any one of the remaining two faces is.

Anonymous User tag : Physics 28 Apr, 2019 211 views

## Suppose that two heat engines are connected in series, such that the heat exhaust of the first engine is used as the heat input of the second engine as shown in figure. The efficiencies of the engines are n1 and n2, respectively. The net efficiency of the combination is given by? Suppose that two heat engines are connected in series, such that the heat exhaust of the first engine is used as the heat input of the second engine as shown in figure. The efficiencies of the engines are n1 and n2, respectively. The net efficiency of the combination is given by?

Anonymous User tag : Physics 28 Apr, 2019 204 views

## A charged particle oscillates about its mean equilibrium position with a frequency of 10^9 Hz. The electromagnetic waves produced? A charged particle oscillates about its mean equilibrium position with a frequency of Hz. The electromagnetic waves produced

Anonymous User tag : Physics 28 Apr, 2019 62 views

## A magnet is suspended in such a way when it oscillates in the horizontal plane. It makes 20 oscillations per minute at a place where dip angle is 30 and 15 oscillations per min at a place where dip angle is 60 . Find the ratio of the total earth's magnetic field at the two places? A magnet is suspended in such a way when it oscillates in the horizontal plane. It makes 20 oscillations per minute at a place where dip angle is 30 and 15 oscillations per min at a place where dip angle is 60 . Find the ratio of the total earth's magnetic field at the two places?

Anonymous User tag : Physics 26 Apr, 2019 98 views

## A 1-meter long narrow solenoid having 1000 turns is placed in magnetic meridian. Find the current in the solenoid which neutralises the earth’s horizontal field of 0.36 oersted at the centre of the solenoid A 1-meter long narrow solenoid having 1000 turns is placed in magnetic meridian. Find the current in the solenoid which neutralises the earth’s horizontal field of 0.36 oersted at the centre of the solenoid

Anonymous User tag : Physics 24 Apr, 2019 88 views

## If the dip circle is set at 45 to the magnetic meridian, then the apparent dip is 30 . Calculate the true dip. If the dip circle is set at 45 to the magnetic meridian, then the apparent dip is 30 . Calculate the true dip.

Anonymous User tag : Physics 24 Apr, 2019 192 views

## At a certain place, the horizontal component of earth's magnetic field is root 3 times of the vertical component. What the angle of dip at that place. At a certain place, the horizontal component of earth's magnetic field is root times of the vertical component. What the angle of dip at that place.

Anonymous User tag : Maths 23 Apr, 2019 567 views

## Discuss the local maximum and local minimum values of f(x). Discuss the local maximum and local minimum values of f(x). Anonymous User tag : Maths 23 Apr, 2019 58 views

## What is Solubility please explain Anonymous User tag : Chemistry 23 Apr, 2019 55 views

## Calculate molality of 2.5 g of ethanoic acid (CH3COOH) in 75 g of benzene Calculate molality of 2.5 g of ethanoic acid (CH3COOH) in 75 g of benzene

Anonymous User tag : Chemistry 23 Apr, 2019 110 views

## Calculate the molarity of a solution containing 5 g of NaOH in 450 mL solution Calculate the molarity of a solution containing 5 g of NaOH in 450 mL solution

Anonymous User tag : Chemistry 23 Apr, 2019 72 views

## Calculate the mole fraction of ethylene glycol (C2H6O2) in a solution containing 20% of C2H6O2 by mass Calculate the mole fraction of ethylene glycol (C2H6O2) in a solution containing 20% of C2H6O2 by mass

Anonymous User tag : Chemistry 23 Apr, 2019 173 views

## How many Type of Solution exist , please describe How many Type of Solution exist , please describe

Anonymous User tag : Chemistry 23 Apr, 2019 55 views

## What is Solvent and Solute, please explain? What is Solvent and Solute, please explain?

Anonymous User tag : Chemistry 23 Apr, 2019 52 views

## What is Solution , please explain? What is Solution , please explain?

Anonymous User tag : Chemistry 23 Apr, 2019 52 views

## In a group of 1000 people, there are 750 who can speak Hindi and 400 who can speak English. How many can speak Hindi only ?How many can speak English ? How many can speak both Hindi and English? In a group of 1000 people, there are 750 who can speak Hindi and 400 who can speak English. How many can speak Hindi only ?How many can speak English ? How many can speak both Hindi and English?

Anonymous User tag : Maths 22 Apr, 2019 75 views

## A billiard ball is hit by a cue at a point distance h above the centre. It acquires a linear velocity v0. Let m be the mass and r be the radius of the ball. The angular velocity acquired by the ball is? A billiard ball is hit by a cue at a point distance h above the centre. It acquires a linear velocity v0. Let m be the mass and r be the radius of the ball. The angular velocity acquired by the ball is?

Anonymous User tag : Physics 20 Apr, 2019 109 views

## A simple pendulum is suspended in a lift which 5. is going up with an acceleration 5 m/s2. An electric field of magnitude 5 N/C and directed vertically upward is also present in the lift. The charge of the bob is 1 mC and mass is 1 mg. Taking g = p2 and length of the simple pendulum 1m, the time period of the simple pendulum is A simple pendulum is suspended in a lift which 5. is going up with an acceleration 5 m/s^2. An electric field of magnitude 5 N/C and directed vertically upward is also present in the lift. The charge of the bob is 1 mC and mass is 1 mg. Taking g = and length of the simple pendulum 1m, the time period of the simple pendulum is

Anonymous User tag : Physics 20 Apr, 2019 132 views