Thursday

September 3, 2015
Total # Posts: 58

**science**

when 8.4 g of NaHCO3 is added to a solution of CH3COOH weighing 20 g .It is observrd that 4.4 g of CO2 is releasd into atmosphere and a residue is left behind .calculate the mass of residue by applying law of conservation of mass .
*May 19, 2015*

**physics**

a bullet fired with a speed of 150 m/sec from car whose velocity is 25/3 m/sec to car next to it whose velocity is 50 m/sec.what is velocity of bullet with respect to ground?
*May 7, 2015*

**physics**

A copper block of mass 500gm and spcific heat0.1cal/gm celcius is heated from30degrees to 290degrees celcius the thermal capacity of block is
*February 25, 2015*

**Physics Kinematics**

The value of d is coming out to be 3.194 and 11.499. Can both be the answers? If not, what value to eliminate and why?
*February 2, 2015*

**Physics Kinematics**

A basketball is launched with an initial speed of 12.0 m/s at 45 degrees from the ground. The height of the basket y = 2.50m. From what distance x the ball is shot? Note : The trajectory is like a basketball shot, the highest point the ball reaches is higher than the basket ...
*February 2, 2015*

**Physics Kinematics**

A puck slides across a smooth, level tabletop at height H at a constant speed Vo. It slides off the edge of the table and hits the floor a distance x away. What is the algebraic relationship between the distances x and H?
*February 2, 2015*

**Physics**

A rock is thrown horizontally from a bridge with a velocity of 13.0 m/s. It takes the rock 3.5 s to strike the water below. What is the magnitude of the velocity of the rock just before it hits the water?
*February 2, 2015*

**math**

a 2 digit number is 9 times the sum of its digits .if it's ones and tens digits be x and y.write a linear equation in two variable
*January 4, 2015*

**Maths**

a 2 digit number is 9 times the sum of its digits .if it's ones and tens digits be x and y.write a linear equation in two variable
*January 4, 2015*

**chemistry**

Acetylene(C2H2), an important fuel in welding, is produced in the laboratory when calcium carbide (CaC2) reacts with water: CaC2(s) + 2H20(l) → C2H2(g) + Ca(OH)2(aq) For a sample of acetylene collected over water, total gas pressure (adjusted to barometric pressure) is ...
*January 1, 2015*

**Math**

the average employee in the united states works for about 248 days per year and receives abt 13 days of paid vacation. write the number of vacation days as a percent of the total number of days worked. round to the nearest 100th's of a percent.
*November 13, 2014*

**themodynamics**

liquid water of mass 10 kg & temperature 20 degree celsius mixed with 2 kg of ice at -5 degree celsius till equilibrium is reached at 1 atm presssure . find entropy ??
*November 12, 2014*

**math**

length of a rectangle exceeds its breadth by 4 m. if the parimeter of the the rectangle is 84 m, find its length and breadth.?
*September 2, 2014*

**physics**

Why electric dipole moment between two charges points from negative to positive charge.
*April 24, 2014*

**stress**

The shear stress in a plane normal of which makes an angle of 30 degree with the direction of maximum principal stress will be ?
*March 7, 2014*

**solid mechanics**

The normal stresses at a certain point in a body are 80MPa tension and 50Mpa compression. There are also shear stresses across the plane of tension and compression equal to 30MPa.Calculate the maximum direct stress and maximum shear stress in the material.
*February 16, 2014*

**math**

Wheel of car is making 5 revolution per second . if the diameter of the wheel is 84cm .find its speed in km/h
*December 25, 2013*

**college physics**

A conductor in a shape of a spherical shell of radii 10 and 12cm in charged to 20 micro coloumb. 1) Find the electric field at the following radii: 2,11,15 cm. 2)Find the electric potential at each of these radii. Repeat part 1 and a -5 microcoloumb point charge is being ...
*October 9, 2013*

**college physics**

The charge per unit length on a long, straight filament is -87.0 µC/m. (a) Find the electric field 10.0 cm from the filament. Distances are measured perpendicular to the length of the filament. (Take radially inward toward the filament as the positive direction.) MN/C (b...
*October 6, 2013*

**college physics**

The charge per unit length on a long, straight filament is -87.0 µC/m. (a) Find the electric field 10.0 cm from the filament. Distances are measured perpendicular to the length of the filament. (Take radially inward toward the filament as the positive direction.) MN/C (b...
*October 6, 2013*

**college physics**

The charge per unit length on a long, straight filament is -87.0 µC/m. (a) Find the electric field 10.0 cm from the filament. Distances are measured perpendicular to the length of the filament. (Take radially inward toward the filament as the positive direction.) MN/C (b...
*October 6, 2013*

**college physics**

a) Two protons in a molecule are 3.80 multiplied by 10-10 m apart. Find the electrical force exerted by one proton on the other. Magnitude N (b) State how the magnitude of this force compares with the magnitude of the gravitational force exerted by one proton on the other. (...
*September 22, 2013*

**college physics**

A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 ÂµC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 36.0 cm from its center. N/C
*September 21, 2013*

**college physics**

In the Bohr theory of the hydrogen atom, an electron moves in a circular orbit about a proton, where the radius of the orbit is approximately 0.542 multiplied by 10-10 m. (The actual value is 0.529 multiplied by 10-10 m.) (a) Find the electric force exerted on each particle, ...
*September 21, 2013*

**college physics**

(a) Two protons in a molecule are 3.80 multiplied by 10-10 m apart. Find the electrical force exerted by one proton on the other. Magnitude N (b) State how the magnitude of this force compares with the magnitude of the gravitational force exerted by one proton on the other. (...
*September 21, 2013*

**PHYSICS**

A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 ÂµC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 36.0 cm from its center. N/C
*September 13, 2013*

**calculus**

Integral sin 8x/2 cosx/2 dx
*September 10, 2013*

**calculus**

Integral -csc^2 (2x+9)dx
*September 10, 2013*

**calculus**

integral cos(4z-5)dz
*September 10, 2013*

**calculus**

integral 3z^6 sqrt(2-3z^7)dz
*September 10, 2013*

**calculus**

Use the indicated substitution to evaluate the integral integral 18sec(2x) tan(2x)dx, u=2x
*September 10, 2013*

**math**

Evaluate the following indefinite integral by using the given substitution to reduce the integral to standard form integral cos(9x) dx, u=9x
*September 10, 2013*

**math**

Evaluate the following indefinite integral by using the given substitution to reduce the integral to standard form integral 2(2x+6)^5 dx, u=2x+6
*September 10, 2013*

**math**

find dy/dx y= integral upper limit tanx and lower limit 0 of dt/1+t^2
*September 10, 2013*

**math**

Evaluate the integral upper limit sqrt11 and lower limit 1 of (s^2 + sqrt 5)/ s^2
*September 10, 2013*

**maths I need answer**

The sum of the tens and ones digits of a 2-digit number is 12. The digit in the tens place is greater than the digit in the ones place The product of the two digits is 35. Find the 2-digit number.
*August 27, 2013*

**maths I need answer**

A 2-digit number has a greater tens digit than the ones digit. The difference between the tens and ones digit is 3. The sum of the two digits is 15. Find the 2-digit number.
*August 27, 2013*

**chemistry**

what is evidnece that cathode rays are part of matter?
*June 22, 2013*

**chemistry**

1)why bohr orbit are called stationary orbit? 2)what do you mean by saying energy of electron is quantised?
*June 22, 2013*

**chemistry**

1)why bohr orbit are called stationary orbit? 2)what do you mean by saying energy of electron is quantised?
*June 22, 2013*

**chemistry**

balance the equations 1)Mg3N2+N2+H2O=Mg(OH)2+NH3 2)KMnO4+H2S+H2SO4=KHSO4+H2O+MnSO4 3)AS2O3+SnCl2+HCL=SnCl4+AS+H2O
*June 22, 2013*

**chemistry**

1)nitrogen atom has atomic no 7 and mass no 14.hydrogen atom has atomic no 1 and mass no 1.what is no of protons and neutrons of ammonium ions
*June 21, 2013*

**math**

Find the area of the triangle whose vertices are (2,3),(3,4),(-2,-4).
*October 13, 2012*

**algebra**

First person 3/8% of sun money and second person 3/8%=first person -sum money. And first person -second person=36 so find sum monex?
*March 9, 2012*

**MATHS**

a gun is fired at a distance of 24.3km away from man. he hears the sound after 27 second. find the speed of sound at which it travels.
*December 13, 2011*

**Economic**

1. Use the following information to answer the questions below. Please note that output of good X is measured in 100’s on the x axis, i.e. if you find Q = 10 then output is 10 × 100 = 1, 000 units. You must have a diagram to support you answers. • Domestic ...
*November 17, 2011*

**Economic**

1. Use the following information to answer the questions below. Please note that output of good X is measured in 100’s on the x axis, i.e. if you find Q = 10 then output is 10 × 100 = 1, 000 units. You must have a diagram to support you answers. • Domestic ...
*November 17, 2011*

**physics**

A uniform chain 10m long and weighing 6 kg permetre hangs vertically.calculate the work required to wind it up
*October 14, 2011*

**Statistics**

780
*October 8, 2011*

**physics**

mein gawar hu mujhe nahi ata
*June 13, 2011*

**math**

Factor completely and then place the factors in the proper location on the grid. 4n2 + 28n + 49
*May 31, 2011*

**physics**

A person walks in the following pattern: 2.9 km north, then 1.9 km west, and finally 8.0 km south. How far and in what direction would a bird fly in a straight line from the same starting point to the same final point?
*September 28, 2010*

**physics**

if co-efficient of friction between tyre and road is0.5, what is smallest radious at which car turn on a horizontal road when its speed is 30km/hr?
*September 27, 2010*

**physics**

a wheel having diameter 2m starts from rest and accelerates uniformly to an angular velocity of 75 revoulutions per minute in 5s. calculate its angular acceleration? Q;- one of the rectangular components of velocity of 80km/hr find other component? Q:-the diameter of sphere is...
*September 27, 2010*

**physics**

if co-efficient of friction between tyre and road is 0.5, what is smallest radious at which car turn on a horizontal road when its speed is 30 km/hr? 2.Q calculate angular speed of how hand of a clock? 3.Q A what angle must cut rack with a bend of 250m banked for safe running ...
*September 27, 2010*

**chemistry**

solve by molarity =no. of moles divide by volume in litres....... so let the mass be in x grms... then : 2.50*0.630=x grms so, x grms of KCl =1.575 grams is the answer
*May 24, 2010*

**math**

i want to make a chart on mathematicians
*June 2, 2008*

**algebra 1**

Factor the following polynomial completely. -x2y2 + x4 + 9y2 - 9x2
*May 15, 2007*

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