Wednesday
August 20, 2014

Posts by eman


Total # Posts: 23

physics
A canal lock gate is 20m wide and 10m deep. calculate the thrust acting on it assume that the water in the canal is in level with the top of the gate. density of water is 1000kg/m^3
September 7, 2013

Physcis
a black of mass 92 kg and volume 0.031 lies at the bottom of the sea how much force is needed to lift it ? take 1.03*10^3 kg/m as the density of sea water
September 7, 2013

calculus 2
Revolved about the x-axis~ must use: integral 2*Pi*y ds (Eq 1) For ds use: ds = sqrt(1+[F'(x)]^2) dx (Eq 2) sinh(x) dx = cosh(x) = F'(x) sub cosh(x) into Eq 2 and you get: ds = sqrt(1+[cosh(x)]^2) dx now sub ds into Eq 1 integral 2*Pi*y*sqrt(1+[cosh(x)]^2) dx We are ...
February 1, 2013

Ap chem
If 200 ml of .300 molarity of silver nitrate are mixed with 350 ml of .500 molarity calcium chloride ions how many grams of percipitate are formed? How many moles of each ions are present?
November 6, 2012

Physics
A 1340 kg car going 21 m/s has to stop suddenly. The driver locks the brakes, and the car skids to a halt in a distance of 67 m . What was the car's acceleration while stopping? How much work was done by friction to stop the car? What is the coefficient of kinetic friction...
October 12, 2011

Phyics
A projectile is fired horizontally from a 39 m cliff at 30m/s . Find the speed and velocity of the projectile when it strikes the ground. Find vx Find vy Find v
October 12, 2011

Physics
Stretching DNA. With its double-helix structure, DNA is coiled like a spring. A biophysicist grabs the ends of a DNA strand with optical tweezers and stretches it 26µm producing 1.2pN- tension in the strand. What's the DNA's spring constant?
October 12, 2011

Physics
A glider (mass = 0.12kg ) on a frictionless horizontal air track is connected by a light string over a pulley to a metal block (mass = 0.13kg ) hanging vertically (see figure below). The objects are released from rest and move 0.44 m . a)Find the objects' acceleration. b)...
October 12, 2011

Physics
A 64kg driver gets into an empty taptap to start the day's work. The springs compress 1.9×10−2 m . What is the effective spring constant of the spring system in the taptap?
October 12, 2011

Physics
A horizontal spring with K = 110 N/m has one end attached to the wall. A 250g block is pushed onto the free end, compressing the spring by 0.190 . The block is then released, and the spring launches it outward. Neglecting friction, what's its speed when it leaves the spring?
October 12, 2011

Physics
Two blocks are connected by a very light string passing over a massless and frictionless pulley (the figure ). Traveling at constant speed, the 20.0- block moves 80.0 to the right and the 12.0- block moves 80.0 downward
December 8, 2010

math
551
September 13, 2010

Chemistry
A solid metal is often known as having 'an array of positive ions in a sea of electrons'. Write down the electronic structure of magnesium atom and use it to explain what this phrase means. Actually I don't know how to explain it. So I need you to explain it in ...
December 4, 2009

Chemistry
What is weighted average in chemistry?
October 11, 2009

chemistry
What is the difference between a metal and an alloy?
September 13, 2009

Arithmetics
What will my peercentage saving be if I buy something in a sale that offers 3 for the price of 2?
August 31, 2009

arithmetic
I know that this question had already been answered. But still I could not understand. Calculate this question and write the answer in standard form.The answer should come 5*10. (4.5*10^12)divided by (9*10^10)
August 31, 2009

physics
Why is it vital that there is friction thatb opposes motion when two surfaces try to slide across one another?
August 31, 2009

arithmetic
calculate this question and write each answer in standard form. (4.5*10^12)dvided by(9*10^10)
August 31, 2009

chemistry
yes
February 1, 2009

calculus
how do i reduced 76/100
December 3, 2008

television
what feeling goes with flowers?
November 15, 2007

Physics
Heat Movement Thermal energy is always moving. No matter what substance is heated, there is always another place for the heat to move, unless all available substances are the same temperature and equilibrium is reached. This is particularly true on earth, where thermal energy ...
March 27, 2007

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