Posts by Omar
Total # Posts: 147
) An oil tankers engines have broken down, and the wind is blowing the tanker straight toward a reef at a constant speed of 1.5 m/s (Fig.1). When the tanker is 500 m from the reef, the wind dies down just as the engineer gets the engines going again. The rudder is stuck...
March 18, 2017
Lolita saved $ 5000 in a saving account which pays 12% interest compounded monthly. Eight months later she saved another $ 5000. Find the amount in the account two years after her first saving.
June 7, 2016
Solve the differential equation: dy/dx = (3x^2) / (y+1) with initial conditions x = -1, y = 2 I have: ∫y + 1 dy = ∫3x^2 dx (y^2 / 2) + y = x^3 + C (2^2 / 2) + (2) = (-1^3) + C? 4 = -1 + C 5 = c (y^2 / 2) + y = x^3 + 5 Is this correct?
May 27, 2016
A 3.50 kg ball with a velocity of 10.00 m/s collides with a stationary ball with a mass of 5.00 kg. After the collision, the first ball travels at a 42.6 degree angle from its original path, while the second ball travels at a -26.7 degree angle from the other ball's ...
March 27, 2016
1) A telephone company has 10,000 phones in a certain city where the basic rate is $4 per month. The officials have evidence that if the charge is reduced the number of phones will increase at an estimated rate of 1,000 phones for each 25 cent reduction. What rate would yield ...
March 21, 2016
Find the point on the graph of y = x2+1 that is closest to the point (3,1). d = √[(x-3)^2+(y-1)^2] d = √[(x-3)^2+(x^2+1-1)^2] d = √[(x-3)^2+(x^2)^2] d = [(x-3)^2+x^4]^1/2 d' = 1/2 [(x-3)^2+x^4)^1/2 [2(x-3)+4x^3] 0 = [1(2x-6+4x^2)] / [2√(x-3)^2+x^4] ...
March 17, 2016
the learner is asked to write a program using java with user input that caculate and displays, the number of months it will take the user to save an amount of money. the user must enter the
November 17, 2015
The MAVEN spacecraft, a NASA mission that is studying the Martian atmosphere, launched from Cape Canaveral in November 2013 on an Atlas V rocket. The rocket burns about 280,000 kg of fuel over 4 minutes (you can assume dm/dt is constant over that interval) and ejects the fuel ...
November 17, 2015
initially 0.25 mol of water vapour and 0.20 mor of carbon monoxide are place in a 1.00 L reaction vessel. at equilibrium spectroscopic evidence shows that 0.10 mol of corbon dioxide is present calculate K for the reaction
October 31, 2015
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
a 2kg ball revolves in a horizontal circle as shown at a constant speed of 1.5m/s. Knowing that L=600mm, determine (a) the angle that the cord with the vertical (b) tension in the cord.
November 20, 2013
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
It seems like I'm answering this 5 years later, but this is for anyone who needs this in the future! Helium is a hydrogen-like atom. Using the fact that the ground state energy of hydrogen is 13.6eV, we can use the relation: E = 13.6eV(z^2/n^2) to calculate the energy ...
April 19, 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