Thursday
August 28, 2014

Posts by Nilan


Total # Posts: 36

Chemistry
how do you convert mg to moles?
January 19, 2013

Chemistry
The dissolved Ca++ concentration in a river is approximately 30 mg/L. This concentration is equivalent to ___ ppm or ___ mol/L, or ___ cmol/L. It would provide ___ cmolc+/L. (c+ is a subscript)
January 19, 2013

math - please help
What is the rotational speed (rpm) of the 64 in diameter rear tires of a tractor traveling at 6.5 mph if there is no slippage? How do I work this? Thank you.
March 31, 2012

math
Estimate the gallons of paint needed to cover the outside of a cylindrical silo which is 30 feet in diameter and 70 feet high. Do not include any roof area. The paint covers approximately 150 square feet/gallon.
March 30, 2012

math
convert: 6000 kg to ___ tonnes (metric tons) 6000 kg to ___tons 1 acre-ft of water to ___gallons 32 psi to ___kpa 10 psfito ___ oz/in^2
March 28, 2012

physics - please help
I forgot to mention that I got 6.417E29 for part A and 2.688E34 for part B. Both answers were wrong. Please help. Thank you.
March 3, 2012

physics - please help
Assume the earth is a uniform sphere and that its path around the sun is curcular. Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the US in one year is about 9.33 x 10^9 J b) Calculate the ...
March 3, 2012

Physics - still confused -Please help
In 9.7 s a fisherman winds 2.1 m of fishing line onto a reel whose radius is 30 cm (assumed to be constant as an approximation). The line is reeled in at constant speed. Determine the angular speed of the reel in rad/s. Thank you.
February 25, 2012

Physics Please help
I'm still confused. to find angular speed = tnngenital speed/radius, would the radii cancel out, leaving only the tangential speed? still confused as to set up
February 25, 2012

Physics
In 9.7 s a fisherman winds 2.1 m of fishing line onto a reel whose radius is 30 cm (assumed to be constant as an approximation). The line is reeled in at constant speed. Determine the angular speed of the reel in rad/s. Thank you.
February 25, 2012

Physics
A box is being with a velocity v by a force P (parallel to to v) along a level horizontal floor. the normal force is Fn, the kinetic frictional force if fk, and the weight of the box is mg. Decide which forces do positive, zero or negative work and why?
February 12, 2012

Physics - position time graph
The graph shows position as a function of time for 2 trains running on parallel tracks. The graph shows line A at a 45 degree angle,beginning at origin. Curve B also begins at origin, continues up and to the right (all in quadrant 1, like a sq root function) It crosses Line A ...
January 29, 2012

Physics
Two forces, F1 and F2, act on the 5.00 kg block shown in the drawing. The magnitudes of the forces are F1 = 69.0 N and F2 = 24.5 N. What is the horizontal acceleration (magnitude and direction) of the block? F1 is pointing at the top left corner of the box forming a 65 degree...
January 21, 2012

Physics Please Help
Force 1 is pushing on the top left corner of the box. The arrow forms a 65 degree angle with the verticle (as if the box were extended straight left, from 9:00 to the arrow = 65 degrees) I found F1 horizontal component to be 69 cos 65 = 29.16 N F2 is pushing to the left. F2 = ...
January 21, 2012

Physics Please Help
Two forces, F1 and F2, act on the 5.00 kg block shown in the drawing. The magnitudes of the forces are F1 = 69.0 N and F2 = 24.5 N. What is the horizontal acceleration (magnitude and direction) of the block? F1 is pointing at the top left corner of the box forming a 65 degree ...
January 21, 2012

algebra - exponentials
My question is how do I know that N increases by a factor of 2.9 each day. (see below) Let N(t) be number of bacteria after t days. N(t) = Pa^t for some constants P and a. N(2) = 5400 and N(6)=382,000. a)before working problem, estimate value of N(5). b) write down 2 equations...
November 6, 2011

algebra - please help
Let N(t) be number of bacteria after t days. N(t) = Pa^t for some constants P and a. N(2) = 5400 and N(6)=382,000. a)before working problem, estimate value of N(5). b) write down 2 equations for P and a, one when t=2 and one when t=6, and use these two equations to compute a ...
November 5, 2011

math
If log (base b) 3 = 1.099 and log (base b) 6 = 1.792, find log (base b) 18 = ???
November 5, 2011

algebra
I won't have access to this on a test. How can I work it on a calculator.
October 15, 2011

algebra
Find all positive solutions to: x^6 + 7x = 4x^4 - x^2 + 8
October 15, 2011

algebra
height of a projectile thrown straight up from top of 480 ft hill t seconds after bing thrown up with initial velocity vo ft/s is h = -16t^2 +vot + 480 If vo = 96, find times when the projectile will be at a) height of 592 ft above the ground and b) crash on the ground.
October 10, 2011

algebra - Please help
Use the equation y = ax^2 + bx + c where x is the horizontal distance a baseball has traveled and y is the height of the ball at the given distance. 1)Are some values of y unreasonable? 2)How is this information important for choosing a window for the graph? 3) With respect to...
October 7, 2011

algebra
Use the equation y = ax^2 + bx + c where x is the horizontal distance a baseball has traveled and y is the height of the ball at the given distance. 1)Are some values of y unreasonable? 2)How is this information important for choosing a window for the graph? 3) With respect to...
October 6, 2011

Algebra
Produce a third degree polynomial that has exactly the roots -3 and 5 with y-intercept 1350. I understand I could start with (x+3)(x-5)^2, but i don't know how to get the y-intercept 1350 with the same conditions. Please help. thank you.
October 4, 2011

Math
Produce a third degree polynomial that has exactly the roots -3 and 5 with y-intercept 1350. I understand I could start with (x+3)(x-5)^2, but i don't know how to get the y-intercept 1350 with the same conditions. Please help. thank you.
October 3, 2011

physics - need help
Resistors of 30 ohms and 60 ohms are connected in parallel and joined in series to a 10 ohm resistor. The circuit voltage is 180 volts. Find: the voltage of the parallel circuit the voltage across the parallel circuit the current through the 10 ohm resistor
May 18, 2011

Physics
what current will flow through a resistance of 11 ohms when the emf impressed acrosss the resistance is 2.8 volts?
May 17, 2011

science
Thank you
May 17, 2011

science
If an ammeter records 8 amperes and a voltmeter records 1.1 volts, the resistance of the conductor in the circuit is ___ ohms
May 17, 2011

physics
If an auto weighing 13,345 N causes a bridge to sag 0.0254 m, a truck weighing 26,690 N would cause the bridge to sag how many meters, assuming the truck was on the same spot as the auto had been? How do I even set this up?
March 16, 2011

physics
So F = 22500 Am I right in thinking it is POSITIVE?
February 20, 2011

physics
a bullet with a mass of 5 g and a speed of 600 m/s penetrates a tree to a depth of 4 cm. Assume that a constant frictional force stops the bullet. Calculate the magnitude of this frictional force. I used KE = 1/2 mv^2 = 900 J then F (friction ) = W/d = 22500 N BUT I don't ...
February 20, 2011

physics
a bullet with a mass of 5 g and a speed of 600 m/s penetrates a tree to a depth of 4 cm. Assume that a constant frictional force stops the bullet. Calculate the magnitude of this frictional force. *Also, I'm not sure if the answer would be positive or negative.
February 20, 2011

physics
a spring with spring constant of 30 N/m is stretched 0.2 m from its equilibrium position. How much work must be done tostretch it an additional 0.1 m?
February 19, 2011

physics
the kilowatt-hour is a unit of: force, work, power, or time?
February 19, 2011

physics
a 2575 kg van runs into the back of a 825 kg compact car at rest. They move off together at 8.5 m/s. Assuming no friction with the ground, find the initial speed of the van.
February 7, 2011

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