Two workers are sliding 310kg crate across the floor. One worker pushes forward on the crate with a force of 440N while the other pulls in the same direction with a force of 230N using a rope connected to the crate. Both forces are horizontal, and the crate slides with a ...
November 21, 2014
A chair of weight 85.0N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 45.0N directed at an angle of 34.0∘ below the horizontal and the chair slides along the floor. Using Newton's laws, calculate n, the ...
November 20, 2014
You pick up a 2.5kg can of paint from the ground and lift it to a height of 1.7m .How much work do you do on the can of paint? You hold the can stationary for half a minute, waiting for a friend on a ladder to take it. How much work do you do during this time?
February 7, 2014
I solved the equation in quadratic since the equation has perfect squares x^2+2x-35+0 ax^2 +bx -c=0 split the bx into 7 and -5 then you have ,x^2 +7x -5x -35=0 then factorize the equation to get x(x+7)-5(x+7)=0 (x-5)(x+7)=0 then equate each identity to zero solve for x x-5=0 x...
February 7, 2014
let the total t-shirts be x then, RED:3x/7 BlUES:x/3 Yellow: x-(3x/7 +x/3)=5x/21 we know reds are 20 more than blues therefore, 3x/7 =(x/3 +20) then solve for x by subtracting x/3 both sides (3x/7)-(x/3)=20 (2x/21)=20 ,multiply 21 both sides to eliminate the denominator ,then ...
February 6, 2014
What is the distance between an object and its real image formed by a thin converging lens with focal length f = 14 cm, if the object distance is 60 cm? (b) What is the minimum object-image distance for a real image formed by that lens?
November 7, 2013
A ball is shot upward from the ground with an initial velocity of 12.0 m/s, along a y-axis that extends upward and that has its origin y = 0 on the ground. How much time does the ball take to move upward from y = 3.00 m to y = 5.00 m?
September 12, 2013
If the water had lost 12000 joules and the calorimeter gained 1300 joules as the temperature of both rock and calorimeter increased from 22°C to 73°C and the mass of rock in the calorimeter was 189 grams, what is the specific heat, c, of the rock material?
September 7, 2013
Height: 10 inches Base Perimeter: 40 inches Lateral Surface Area: 400 square inches (^^^this is the total surface area of the sides) What is the Surface Area of the triangular prism? (the picture of the shape looks like a pentagon but the rectangle is much longer)
August 26, 2013
Height: 10 inches Base Perimeter: 40 inches Lateral Surface Area: 400 square inches (^^^this is the total surface area of the sides) What is the Surface Area of the triangular prism?
August 26, 2013
A pilot flying at an altitude of 3500 feet sees a baseball field at an angle of depression on 35 degrees. what is the pilot's approximate horizontal distance, x, from the baseball field at this point? round your answer to the nearest foot.
April 26, 2013
In a head-on collision, a car stops in 0.13s from a speed of 26m/s . The driver has a mass of 62kg , and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?
October 5, 2012
A solution consisting of water and ethanol is found to have a refractive index of 1.3541 at 20 degrees C. The refractive indices at 20 degrees C of water and ethanol are 1.3330 and 1.3610, respectively. Determine the molar composition (in percent) of the mixture by assuming a ...
October 26, 2011
a 1500 kg car travelling at 16.7 m/s to the south collides with a 6300 kg truck that is initially at rest at a stop light. the car and the truck sticks togetherand moves together after the collision. what is the final velocity of the two-vehicle mass? answer in units of m/s.. ...
May 30, 2011
a car, moving at 100 mi/hr, passes a stationary police car whose siren has a frequency of 500 Hz. what is the frequency change heard by observer in the moving car as he passes the police car? the velocity of sound in air is 343 m/s. ( 1 mi= 1.609 km). answer in units of Hz.
May 30, 2011
a sound wave has frequency of 631 Hz in air and a wavelength of 0.54m. what is the temperature of the air? assuming the velocity of sound at 0 degree celcius is 334 m/s. answer in units of celcius.
May 30, 2011
how do u find the acceleration of the sled? and what applied force would be required to cause the sled to move at a constant velocity, explain your logic and show all your calculations.
April 3, 2011
object A exerts a gravitational force of magnitude 8.2 x 10^-10 N on object B. determine the magnitude of the gravitational force if, simultaneously, the separation distance is tripled, mA increased by 4 times and m8 is halved. explain your reasons and show all calculations.
March 31, 2011
density of ice 917 kg/m^3, density of sea water is 1025 kg/m^3, a piece of ice floating has a volume of 5.2 m^3, what is the weight of the heaviest bear the ice can support without sinking?
November 29, 2010
10X+7y= amount of money earned X= hours tutoring constraints: X+Y less than or equal to 16 X greater than or equal to 3 X less than or equal to 8 Graph it and find coordinates of intersectoin, then plug them in and see which one gives you the most money
October 14, 2010
I did a lab for Organic Chemistry I did a simple distillation for an unknown and found that it boiled at 76 degrees. I also found out that the unknown was ethanol since we knew what the 4 possibilities were and mine was closest to ethanol. I also did a fractional distillation ...
October 6, 2010
90Sr is one of the harmful radionuclides resulting from nuclear fission explosions. It decays by a first-order process with a half-life of 28 years. How many years would it take for 99.99% of a given sample released in the atmosphere to disintegrate? Answer in units of years. ...
April 29, 2010
Consider the first order reaction A --> products where 25% of A disappears in 24 seconds. What is the half life of this reaction? ...i thought it would just be doubled but it isn't. i'd appreciate an explanation.
April 29, 2010
its from our che 302 hw... the answer choices are: 1. 2 HNO3 + 3 Zn(s) <==> 2 NO(s) + 3 ZnO + H2O 2. 2 HNO3 + 3 Zn(s) <==> 2 NO(s) + 3 ZnO 3. HNO3 + Zn(s) + H+ <==> NO(s) + ZnO + H2O 4. 3 HNO3 + 2 Zn(s) <==> 3 NO(s) + 2 ZnO 5. 3 HNO3 + 2 Zn(s) + 7 H+ &...
April 11, 2010
dubai modern eduction school
the treansrer form of the club budgets $60 for gasoline .The CuRRenT Gas Price is$a.95/gallon.the school van gets anaverage of 20 milesper gallon OF gasoline. Determins how many mlies they can drive on this budget. RounD your answer the nearest mile.
March 29, 2010
accounting (balance sheet, retained earnings...)
Problem P3-5A On September 1, 2002, the account balances of Rijo Equipment Repair Corp. were as follows: Nbr: Debits Nbr: Credits 101 Cash $4,880 154 Accumulated depreciation $1,500 112 Accounts receivable 3,520 201 Accounts payable 3,400 126 Supplies 2,000 209 Unearned ...
October 29, 2008
__Glycolysis is used to gain energy from glucose. How efficient is it (give an actual number) in its ability to get the energy from glucose into ATP? (assume the organism is undergoing anerobic fermentation). __You are studying a particular reaction in cells and determine that...
September 24, 2008
An inherited trait among humans in Norway causes affected individuals to have very wavy hair, not unlike that of a sheep. The trait, called woolly, is very evident when it occurs in families; no child possesses woolly hair unless at least one parent does. Imagine that you are ...
November 26, 2007
Let's say that you and two partners want to start a company that specializes in special occasion gift baskets for individuals and corporate clients. You want to have a storefront in the local shopping mall or shopping area, as well as a vertual starfont on the internet. ...
October 7, 2007