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Posts by Ahmed

Total # Posts: 134

Math
A pendulum is connected to a rope 3 m long, which is connected to a ceiling 4 m high. The angle between its widest swing and vertical hanging position is pi/3. If the pendulum swings out to its widest position in 2 seconds, model the height of the pendulum from the ground ...

Trigonometry
Steve, can you please explain how you got 3/2 for the height of the pendulum at its widest position

Trigonometry
Can you please explain how you got the value of 3/2 for the height when the pendulum was at its widest swing?

Trigonometry
Ok. I want to know how you got the maxiumum height, I knew the minimum height.

Trigonometry
Would it be 4-3/2=1/2 for the amplitude?

Trigonometry
Hello, I want to know what the amplitude and the phase shift would be for this question to model the equation Q. A pendulum is connected to a rope 3 m long, which is connected to a ceiling 4 m high. The angle between its widest swing and vertical hanging position is pi/3. If ...

statistics
A random variable has aprobability function p(x)=kx; x=1,2,3,4,5.find the value of k, p(x>=3),compute mean and variance of x.

PHYSICAL CHMISTRY
A sample of methane gas of mass 35 g at 250 K and 12.5 atm expands isothermally until its pressure is 1.5 atm. Determine the change in entropy of the gas.

Math
Consider ?C such that sin C = 7/25 a) What are the possible quadrants in which ?C may lie? b) If you know that cos C is negative, how does your answer to part a) change? c) Sketch a diagram to represent ?C in standard position, given that the condition in part b) is true. d) ...

Physical
A toy rocket is launched vertically from ground level (y = 0 m), at time t = 0.0 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 73 m and acquired a velocity of The rocket continues to ...

Geography
Name three key reasons for migration

geography
I need to compare a coastal, mountainous or desert area from Australia to a counterpart in a developing country then discuss their management, sustainability, tourism applications etc. I need assistance in choosing countries as I am having trouble finding relevant information.

Math
Charlotte divided a whole pizza into 4 pieces . One piece formed a straight angle. One piece formed a right angle . Two pieces formed acute angles with the same degree measure

phyis
a 5 gram rubber ball is released from a height of 7 meter above flat surface on the moon. gravitational acceleration on the moon is 1.62 meters per second squared. assume that no energy is lost from frictional drag. what is the velocity, in units of meters per second, of the ...

chemistry
how to draw bicyclo 3.1.1 heptane ? I need steps to draw any of this compounds in exam ?

chemistry
which of the following has highest binding energy (nuclear chemistry) Fe-56 , O-16 , H-3 , U-235 and explain why

chemistry
nuclear

chemistry
why iron 56 has highest binding energy than oxygen 16 , although oxygen 16 more stable than iron 56 ???

chemistry
the half-life of tritium is 12.26 y what would be the rate of decay of tritium atoms per second in 1.00 L of hydrogen gas at STP containing 0.15% tritium atoms ?

Math
box 569 divided by 6 is 400 what digit show be in the box?

chemistry
the half-life of tritium is 12.26 y what would be the rate of decay of tritium atoms per second in 1.00 L of hydrogen gas at STP containing 0.15% tritium atoms ?

chemistry
What would be the mass ratio of Pb-208/Th-232 in a meteorite that is approximately 4.5 × 10^9 years old? The half-life of Th-232 is 1.39 x 10^10 years i'm used t= 3.32 t(1/2) logNo/N but the result is not correct !?

chemistry
isotope A require 12h for its decay rate to fall to 1/64 of its intial value . isotope B has half-life = 1.5 half life of A how long does it take for decay rate of B fall to 1/32 of its initial value ?

basic mathematics
ii) A box contains 10 white, 7 black and 3 green balls. 2 balls are drawn at random. Find out the probability that: a) both are white b) one is white and another is green c) one is black and another is green

physics
A soccer ball is kicked from the ground with initial speed 17 m/s. at angle(a 20 Find a) The horizontal distance that the ball travels after 4s? b) The speed of the ball at the highest point?

Grover Cleveland high school
I don't know the answer

Grover Cleveland high school
Ramy jumped from the window from the height of 400 feet. His speed of feeling was 10 feet. second write a functions to represent the situation.explain the answer please

Physics 12 college preparation
Find the work done by a traveller carrying a suitcase of mass 8.2 kg by pulling up on it when walking forward for a distance of 120 m . Explain your reasoning

physics
On a plot of position x versus time t for an object’s motion, what corresponds to the object’s average velocity between instant t1 and instant t2? (a) intercept of the plot on the horizontal axis (b) intercept of the plot on the vertical axis (c) slope of a line ...

mahamuud xarbi
a motorboat accelerates uniformly from a velocity of 6.5m/s the west to velocity of 1.5m/s to the west if its acceleration was 2.7m/s^2 to the east how for did it travel daring the acceleration

math
Bob does 2/7 of a book in 1 hour.how long will he take to do the remaining work?

physics
the positive point charges + q are placed at three corners of a square , and a negative point charge -Q is placed at the fourth , corner. the side of the square is L. calculate the net electric force that positive charges exert on the negative charge

physics
A 4.40kg bucket of water is accelerated upward by a cord of negligible mass whose breaking strength is 74.0N

physics
A block of mass m slides down a frictionless incline as The block is released from height h above the bottom of the circular loop. (a) Find the force exerted on the block by the inclined track at point A. (Hint: Consider the Newton’s 2nd law in the radial direction and ...

Math
50+225

math
5

electromagnetic just put the rule
In a certain material for which µ = 6.5 o  , H = 10ax + 25ay - 40az A/m Find (a) The magnetic susceptibility xm of the material (b) The magnetic flux density (c) The magnetization, (d) The magnetic energy density I just want the rule of them

Materials Science
-8.4 *10^-5

Physics
A force F acts to the right on a 4.81 kg block. A 2.53 kg block is stacked on top of the 4.81 kg block and can slide on it with a coefficient of friction of 0.2 between the blocks. The table has a coefficient of friction of 0.23. The acceleration of gravity is 9.8 m/s 2 . The ...

math
a quart is approximately sixty cubic inches. a cubic feet of water weighs approximately sixty pounds. therefore, a quart of water weighs, approximately

mechanics
A diver’s take - off velocity is 5 m/s at an angle of 15º to the horizontal during a dive. His centre of gravity is 0.4 m above the pool deck level at take - off (point A, Figure Q1(a)) and is 0 m above deck level when he enters the water (point D, Figure Q1(a)). How...

maths
She adds the to number together and divides the result by 2her answer is 44 one of EMilys numbers is 12what is Emilys other number?

كيمياء
q// calculate the concentration of Potassium ion in grams per liter after mixing 100mL of 0.250M KCL and 200 mL OF 0.100 M k2SO4?

UOS
A parallel plate capacitor has a capacitance of 7.0mF when filled with a dielectric. The area of each plate is 1.5m2 and the separation between the plates is 1.0x10-5m. What is the dielectric constant of the dielectric?

Calculus Help Please!!! Found the answer
(-0.383,0.516)

Chemistry Help Please!!!
Find Net Ionic equation for hydrolysis , Expression for equilibrium constant (Ka or Kb) and Value of (Ka or Kb) Net Ionic equations I've got NaC2H3O2 == CH3COO^-+H2O -->CH3COOH+OH^- Na2CO3 ==== CO3 + 2H2O → H2CO3 + 2-OH Kb = [H2CO3] [-OH]2 / [CO3]. Kb = 1/Ka1Ka2...

Calculus Help Please
the linear app. appears to be best for the function ___f___ since it is closer to ___f__ for a larger domain than it is to _g and h____ . the app. looks worst for ___h__ since _h____ moves away from L faster than __f and g___ do.

Calculus Help Please Check!!!
Lf(x)= 1-2x Lg(x)= 1-2x Lh(x)= 1-2x the linear app. appears to be best for the function ___f___ since it is closer to _____ for a larger domain than it is to _____ . the app. looks worst for ___h__ since _____ moves away from L faster than _____ do. i couldn't figure out ...

Calculus Help Please
let f(x)=(x-1)^2, g(x)=e^(-2x), and h(x)=1+ ln(1-2x) find linearization of f, g, and h at a=0 Lf(x)= Lg(x)= Lh(x)= graph f,g, and h, and their linear app. For which function is the linear app. best? for which is the worst? explain. the linear app. appears to be best for the ...

physics
A gry is an old English measure for length, defined as 1/10 of a line, where line is another old English measure for length, defined as 1/12 inch. A common measure for length in the publishing business is a point, defined as 1/72 inch. What is an area of 0.42 gry2 in points ...

physics
If the average time from one on state to the next one on the first photogate is 0.005 seconds, what is the speed of the cart at this point (LEAVE OUT the units of m/s)?

Numerical Analysis
can anyone just tell which rule i can use

Numerical Analysis
Use appropriate Lagrange interpolating polynomials of degrees one, two, and three to approximate each of the following: a. f(8.4) if f(8.1) = 16.94410, f(8.3) = 17.56492, f(8.6) = 18.50515, f(8.7) = 18.8209 help pls

marine physics
If the sea level rises by 20 cm from west to east , across the Red sea, a distance of 250 km at 20 N, what is the average speed and direction of the current

Physics
10m/s

Engineering
A 10.0 Kg block is released from point A in the figure below. The block travels along a smooth frictionless track. It makes a collision with stationary 10 kg ball. The ball moves forward with speed of 2 m/s. a) What is the speed of the block at point C? b) What is the velocity...

marine
on perfectly smooth and frictionless hockey field at 20n , how slowly a puck be driven to perform an inertial circle of diameter equal to the field width 26m

math
If i earned $20 in January,$5 in February and $20 in March! What is the mean (average) amount of money earned for these 3 months? what is the answer and can you explain the question to me please

mechanics
B 7.0x103 Dear who are you??? mail me on

physical
An asteroid in an elliptical orbit about the sun travels at 3.9 106 m/s at perihelion (the point of closest approach) at a distance of 3.7 108 km from the sun. How fast is it traveling at aphelion (the most distant point), which is 8.6 108 km from the sun?

World history
This relationship has started some kind of wars, because It had sour between the people doing what they are supposed to do when they don't have any choice. In this war they for they armies to surrender or suffer death in the art of war.

answer
for number 1 its D for number 2 its B for number 3 its B for number 4 its C

engineering
can you give us the solution

COMPUTER SCIENCE JAVA
Assignment problems: Write Java programs for each of the following. 1. Students in a university class are being organized into groups of three for an upcoming research project. To model this situation: a. Write a Student class that stores the name, email address and phone ...

COMPUTER SCIENCE JAVA
Assignment problems: Write Java programs for each of the following. 1. Students in a university class are being organized into groups of three for an upcoming research project. To model this situation: a. Write a Student class that stores the name, email address and phone ...

us history
Which was not one of the causes of the Great Depression? (Points : 5) excessive income taxes speculative stock purchases risky banking practices severe drought

math
The graph of the range of scores for the games is shown below. The inequality for the graph can be expressed as 32 ≤ r ≤ m where r is the minimum range of the scores in any of the games and m is the maximum range. What is the value of m?

math
The javelin event is held on the field inside the track. This field is a rectangle measuring 100 meters by 64 meters, with a semicircle at each end. Early modern Olympic javelins were designed so well that javelin throwers could throw them beyond the field and onto the track. ...

Physics grade 12
F=q•v•B•siná, sin á =1. mv^2/R = q•v•B, R= mv/qB. The period is T =2•ð•R/v = 2•ð•m/q•B. For á-particle T = 2•ð•4m(p)/2•e•B. T/2 = 2•ð• m(p)/ e•B

Ss
The influence of oil in Saudi Arabia has effected Saudi Arabia. For example they used oil accounts for more than 90% of exports and nearly 75% of government revenues, facilitating the creation of a welfare state. Another example is that  the government is attempting to ...

math
37.5

mpf
how long will it take for $ 500 to amount $700 of interested at $8% compounded quarterly?

Physics
vector a points in the negative x direction and has a magnitude of 22 units . The vector B points in the positive y direction a. Find the magnitude of B if A+B has a magnitude of 37 units b. sketch A and B

Algebra
3mn+6m + pn+2p and am not sure

math
Put g in f so 5(3x-4)+2 15x-20+2 =15x-18

calculus
determine the intervals where f(x) = ln(6x-24) is continuous

Math
19->1]^.>~>|\352564

Math
How do you substitute a proportion

math
What amounts are to be adjusted?

chemistry
One of the steps in the Ostwald process for the production of nitric acid involves oxidation of ammonia. 4NH3 (aq) + 5O2 (g) <---> 4NO (g) + 6H2O (g), Delta H= -905kJ a) State the reaction conditions that favour the production of nitrogen monoxide. b) A rhodium/platinum ...

physics
A boat’s speed in still water is vBW = 1.85 m/s. If the boat is to travel directly across a river whose current has speed vWS = 1.20 m/s, at what upstream angle must the boat head?

candle
The flywheel of a prototype car engine is under test. The angular position θ of the flywheel is given by θ = (3.0rad/s3)t3 and the diameter of the flywheel is 36cm. (a)Find the distance that a particle on the rim moves during that time interval. (b) Find the angle &#...

Math
do the following moves in a coordinate system: start at the origin facing in the positive y direction and move 1 unit. For each subsequent move, it is to turn 90 degrees clockwise and go forward 1 unit farther than it went in the previous move. What is the sum of the ...

plz help me in physics
A ship leaves the island of Guam and sails a distance 295km at an angle 35.0 north of west. a:In which direction must it now head so that its resultant displacement will be 100km directly east of Guam? (Express your answer as an angle measured south of east) b:How far must it ...

physics
the unit of the distance is km but plz can you give me the answer directly

physics
A ship leaves the island of Guam and sails a distance 295 at an angle 35.0 north of west. How far must it sail so that its resultant displacement will be 100 directly east of Guam?

PHYSICS
Two vectors and have magnitude A = 2.90 and B= 3.00. Their vector product is A X B= -4.91 + 2.08. What is the angle between A and B?

physics
thnx very much its correct

physics
You are camping with two friends, Joe and Karl. Since all three of you like your privacy, you don't pitch your tents close together. Joe's tent is 16.0 from yours, in the direction 26.0 north of east. Karl's tent is 29.0 from yours, in the direction 35.0 south of ...

CHEMISTRY
WHAT ARE FACTOR FAVOURING THE FORMATION OF A COVALENT BOND SHORT NOTE?

stat
Weinberger and Spotts compare the use of humor in television ads in the United States and the United Kingdom. Suppose that independent random samples of television ads are taken in the two countries. A random of 400 television ads in the United Kingdom reveals that 142 use ...

english
please,help me find mistake in the following sentence she is very hardworking so not very imaginative

tax accounting
Congress recently enacted an non refundable credit based on the cost of the qualifying alcohol and drug abuse counseling programs provided by and corporate employer to its employees . The credit is limited to 50 % of the total cost of the program .if a corporation elects the ...

social studies
Ways to be safe in class

math
1404.37

chemistry
the solution contain 6 grams of caustic soda dissolved per dm.find the percentage impurity

Social St
What kind of indians already lived in colonial New York?

Geomtry
2.6

chemistry
nearest star distance of 4.3 light years proxima centauri is the nearest star to our solar system. what is the distance to proxima centauri kilometers? the speed of light in space is 2.998 x10^8 m/s.

Science
inherited

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