Saturday

February 25, 2017
Total # Posts: 83

**physics**

A man drags a sack of flour of mass 50 kg at constant speed up an inclined plan to a height of 5m. The plane makes an angle of 30„awith the horizontal and a constant frictional force of 200 N acts on the sack down the plane. 1- How much work does the man do A- against ...

*January 30, 2010*

**physics**

Robin exerts a force of 100 N in pulling back his bow by 0.5 m. He fires the arrow (mass=0.2 kg) vertically upwards. a-How much energy is stored in his bow. b-How high does the arrow go?

*January 29, 2010*

**physics**

Galileo drops a stone from the leaning tower of Pisa, which is 45 meters high. At what speed does the stone hit the ground?

*January 29, 2010*

**physics**

A student finds that a stretched rubber band stores 3.5 J of energy. She uses it to propel an object of mass 0.025 kg vertically upwards. What will be the initial speed of the object? How high can it travel before coming momentarily to rest?

*January 29, 2010*

**physics**

A crane lifts 1 tonne of concrete through a height of 25 m. How much work does it do? (1 kg has a weight of 9.81 N.)

*January 29, 2010*

**physics**

The spectrum of light from the galaxy M100 has a prominent dark line at a wavelength of 592.2 nm. The same spectral line observed in a lab on earth has a wavelength of 589.4 nm. How fast is M100 moving relative to earth? (the speed of light = 3.00 x 108ms-1)

*January 29, 2010*

**physics**

A force of 100N pulls a box of weight 200N along a smooth horizontal surface makes 45(degree) to the floor . Calculate the work done by the force. A- in moving the box a distance of 25m along the horizontal. B- against gravity. C- against normal force.

*January 29, 2010*

**chemistry**

what is the difference between the real gases and the ideal gases ???

*January 27, 2010*

**math**

what will investment of 10 000 Yen amount to after 5 years if it earns 8% p.a. compund semi-annually ?

*January 23, 2010*

**math**

find the general term (un), of the geometric sequence which has : u7=24 and u15= 384 thank u

*January 23, 2010*

**math**

find k, given that the following are consecutive term of a geometric sequence. k,k+8,9k thank u

*January 23, 2010*

**math**

find the exact values when : x^2+2x >= 5

*January 22, 2010*

**math**

thank u :)

*January 21, 2010*

**math**

a rhombus has an area of 50 cm^2 and an internal angle of size 63 . find the lenght of its sides.

*January 21, 2010*

**math**

c 4.2/10^3 = 0.0042

*January 16, 2010*

**Math**

a 3 1/5 + 2 1/2 = 5.7 = 6

*January 16, 2010*

**math**

c 67800/10^3 = 67.8

*January 16, 2010*

**math**

A 5300*10^-3 = 5.3

*January 16, 2010*

**physics - power(3)**

A force of 48 N pushes a 2 kg object initially at rest a distance of 3m along frictionless horizontally surface. Find: A- The work done on the object. B- The power of the applied force.

*January 16, 2010*

**physics - power(2)**

A force of 100N pulls a box of weight 200N along a smooth horizontal surface (angle 45) . Calculate the power of the applied force.

*January 16, 2010*

**physics - power(1)**

A grocer lifts an 8.0-kg carton from the floor to a height of 0.80 m in 5 sec. Calculate the power of man.

*January 16, 2010*

**physics - work 2**

A force of 100N pulls a box of weight 200N along a smooth horizontal surface (angle = 45) Calculate the work done by the force. A- in moving the box a distance of 25m along the horizontal. B- against gravity. C- against normal force.

*January 16, 2010*

**physics - work**

thank u and the answer will be w= mgh = 2*10*0.75 = 15j correct ?!!

*January 16, 2010*

**physics - work**

Imagine you find a 2 kg book on the floor and lift it 0.75 meters and put it on a table. find the work done ?

*January 16, 2010*

**math**

1 ms = ? s 1 mile second = ??? second

*November 21, 2009*

**physics**

A trajectile, of mass 20 g, traveling at 350 m/s, strikes a steel plate at an angle of 30-degrees with a plane of the plate. It ricochets off at the same angle, at a speed of 320 m/s. What is the magnitude of the impulse that the steel plate gives to the trajectile?

*November 19, 2009*

**spanish**

No me gusta la historia

*November 19, 2009*

**math**

i think 3/16 , because the total of the marbel is 16 and u want the probability of the yellow which equal to 3 . :)

*November 19, 2009*

**physics**

A billiard ball approaches a cushioned edge of a billiard table with momentum, p. After the collision with the cushion, it bounces straight back with the same amount of momentum in the opposite direction. What is the impulse on the ball?

*November 19, 2009*

**physics**

i solve it but i am not sure that they need the impulse , i think they need the velocity that will act on it ! because they say how much impulse does the mass experience .. impulse = change in momentum impulse = m x v 1200 = 60 x v 1200\60 = 60 x v \ 60 v= 20 ms-1 ????

*November 19, 2009*

**physics**

If a force of 300N is exerted upon a 60 kg mass for 4 seconds, how much impulse does the mass experience?

*November 19, 2009*

**Math**

3ã2+(ã2)^3 i don't know how to add them ??

*November 13, 2009*

**10th grade algebra not ms.sue**

never true check ur answer by : x=1 1+1=1+0 2=1 so its never true :D

*November 12, 2009*

**ENGLISH**

can you please gave me 3 argument with there evedence about useing a cell phone while driving .. thank u ..

*November 12, 2009*

**Math**

Use Pascal’s triangle to read off the coefficients of the powers of x in the expansion of (1 + x)n for different values of the positive integer n. Check the results for n = 3 by expanding (1 + x)3.

*November 7, 2009*

**Math**

Draw a diagram to represent the identity (a + b)2 = a2 + 2ab + b2.

*November 7, 2009*

**math**

Rationalise the expression 1/(ã2 + ã3).

*November 7, 2009*

**math**

Melons cost QR1.5 each and apples cost QR3.75 per kilogram. A man buys apples and melons at the supermarket. Write a formula to describe the total cost of his purchase. Investigate how many melons and how many kilograms of apples he could buy for QR30. **QR is a currency :)

*November 7, 2009*

**math**

how many squares are there in the shape ? and how rectangles are there in it ? {}{}{}{} {}{}{}{} {}{}{}{} {}= mean a square ...

*April 22, 2008*

**math**

Two mothers and two daughters were fishing.Thy managed to catch one big fish , one small fish and one fat fish . SINCE THEY CAUGHT A TOTAL OF ONLY THREE FISH , HOW IS IT POSSIBLE THAT THEY EACH TOOK HOME A FISH ? PLEASE.... EXPLAIN YOUR ANSWER :)

*April 22, 2008*

**math**

One morning , Moe, Joe and Hani left home with each one wearing a hat and a coat belonging to one of the others. Joe was wearing Moe's coat and Hani's hat . WHOSE HAT AND COAT WERE MOE AND HANI WEARING? please.... explain your answer .

*April 22, 2008*

**math**

An island has no currency, it insted has the following exchange rate : 50 bananas = 20 coconuts 30 coconuts = 12 fish 100 fish = 1 hammock HOW MANY BANANAS EQUAL TO 1 HAMMOCK ? please ... explain your answer :)

*April 22, 2008*

**math**

prove that in an isosceles triangle the angles opposite to the equal sides are also equal .

*April 17, 2008*

**math**

how so we indicate the congruence of two right angles triangles ?

*April 17, 2008*

**math**

how do we indicate the congruence at two triangles with two sides and the contained angle of the one equal two corresponding sides and the corresponding contained angle of the other ?

*April 17, 2008*

**math**

An RCMP patrol boat left Long Beach, British Colombia, and sailed west for 2 h at 15 K/h, then north for 2h at 20 K/h, then east for The at 10 k/h How far was the patrol boat from Long Beach, to the nearest tenth of a Kilometer? please explain your answer

*March 15, 2008*

**math**

a chessboard has diagonals of lengths 40 m. what is the length of each side of the board, to the nearest length of a centimeter? Explain t on reasoning.

*March 15, 2008*

**math**

the base of the pyramid of Khufu is a square with side 230m long. calculate the length of the diagonal of this square. too the nearest tenth of a meter. please Explain your answer...

*March 15, 2008*

**math**

Tom drives from his house to his office. He drives 64 km east and then along the new Square Route Expressway. please Explain your answer...

*March 15, 2008*

**math**

a quilter wants to use as many of his 65 small fabric squares as possible to make one large square quilt . A- how many small squares can the quilter use ? B- how many small squares would he ahve left ? C- how many more squares would the quilter need to make the next largest ...

*March 8, 2008*

**math**

MY ANSWER IS THEY SUBTRACT THE EXPONENT AND THEN THEY SIMPLIFY THE FRACTION THE CORRECT ANSWER IS 3^5 = 243 9^5 = 59049 59049 / 243 = 243 IS MY ANSWER CORRECT ?!

*March 2, 2008*

**math**

A STUDENT SAID THAT 3^5 / 9^5 IS THE SAME AS 1/3 . WHAT MISTAKE HAS THE STUDENT MADE ?

*March 2, 2008*

**math**

Posted by mota on Saturday, March 1, 2008 at 3:34am. THE MASS OF THE SUN IS ABOUT 10^27 METRIC TONS , OR 10^30 KILOGRAMS . HOW MANY KILOGRAMS ARE IN ONE METRIC TON ? ----------------------------- math - drwls 1000. ----------------------------- explain please i want to ...

*March 2, 2008*

**math**

Posted by mota THE MASS OF THE SUN IS ABOUT 10^27 METRIC TONS , OR 10^30 KILOGRAMS . HOW MANY KILOGRAMS ARE IN ONE METRIC TON ? ----------------------- math - drwls 1000. ----------------------- explain please i want to understand this question :) this is my question i posted ...

*March 2, 2008*

**math**

thanks for answer but i need it in deteal to understand the question

*March 1, 2008*

**math**

A GOOGOL IS THE NUMBER 1 FOLLOWED BY 100 ZEROS . a) WHAT IS A GOOGL WRITTEN AS A POWER ? b) WHAT IS A GOOGOL TIMES A GOOGOL WRITTEN AS A POWER ?

*March 1, 2008*

**math**

THE DISTANCE FROM EARTH TO MOON IS ABOUT 22^4 MILES . THE DISTANCE FROM EARTH TO NEPTUNE IS ABOUT 22^7 MILES . WHICH DISTANCE IS GREATER ? ABOUT HOW MANY TIMES GREAT ?

*March 1, 2008*

**math**

USING THE MANUFACTURING TERMS BELOW , TELL HOW MANY DOZEN IN A GREAT GROSS. HOW MANY GROSS ARE IN A GREAT GROSS ? --------------------------- 1 DOZEN = 12^1 ITEMS 1 GROSS = 12^2 ITEMS 1 GREAT GROSS = 12^3 ITEMS

*March 1, 2008*

**math**

explain please i want to understand this question :)

*March 1, 2008*

**math**

THE MASS OF THE SUN IS ABOUT 10^27 METRIC TONS , OR 10^30 KILOGRAMS . HOW MANY KILOGRAMS ARE IN ONE METRIC TON ?

*March 1, 2008*

**math**

parallel and perpendicular lines Determine an equation of each of the following lines . *the line perpendicular to y-4=0 and passing through the point (-1,6) ** the line perpendicular to 3x-12y+16=0 and having the same y-intercept as the line 14x-13y-52=0 and explain ....

*January 8, 2008*

**math**

ok when i plot the point i goin them or no? and why ?

*December 29, 2007*

**math**

graph y = 2x - 3 and the domain is the real number when i plot the point without goin them or with goin them ? explain when i draw the line in grade papper or ony plot the point

*December 29, 2007*

**math**

the median of a set of six number is 2.5 given that five number are 8, 1 , 2 , 11 and 1 , find the sixth number . and explain ...

*December 28, 2007*

**math**

i don't understand

*November 30, 2007*

**math**

my question in (slope) find the coordinates of a quadrilateral so that the slope of all four sides are negative ??? please explain your answer .

*November 30, 2007*

**math**

my question in (slope) find the coordinates of the vertices of a triangle so that the slope of all three sides are positive ??? please explain your answer .

*November 30, 2007*

**math**

my question in (ddistance between two point ) show that the quadrilateral with vertices K(3,4),L(2,0),M(-3,-2), and N(-1,3) is a kit ?

*November 23, 2007*

**math**

i don't understand :(

*November 23, 2007*

**math**

my question in (distance between two point) rectangle QRST has an area of 6 square units, and Q is at the origin. R lies on the x-axis, T lies on they-axis , and the coordinates of the vertices are whole numbers. what are the possible sets of coordinates of the rectangle ?

*November 23, 2007*

**math**

have a question in math (( distance between two points )) the coordinate of the diameter of a circle are (6,4) and (-2,0) find the length of the radius of the crcle. please in detales .. thank u

*November 10, 2007*

**math**

have a question in math (( distance between two points )) the coordinate of the diameter of a circle are (6,4) and (-2,0) find the length of the radius of the crcle. please in detales .. thank u

*November 10, 2007*

**math**

have a question in math (( distance between two points )) show that C(-5,-1)is the midpoint of the line segment joining A(-2,5) and B(-8,-7) please in detales .. thank u

*November 10, 2007*

**math**

have a question in math (( distance between two points )) show that C(-5,-1)is the midpoint of the line segment joining A(-2,5) and B(-8,-7) please in detales .. thank u

*November 10, 2007*

**math**

I have a question in (( distance between two points )) show that A(4,2), B(-2,-2) and C(2,-8)are the vertices of an isoceles right triangle. please in detales .. thank u

*November 10, 2007*

**math**

can u explain how u get the height ?

*November 9, 2007*

**math**

thank u

*November 9, 2007*

**math**

i have a question in math (( distance between two points )) the vertices of a right triangle are S(-2,-2), T(10,-2), and R(4,5). find the area of the triangle. please in detales .. thank u

*November 9, 2007*

**math**

hi i think theere is something wrong in the answer PR = ã((5+2)^2 + (3+3)^2) = ã85 because the rule is ã((x2-x1)^2 + (y2-y1)^2)

*November 9, 2007*

**math**

it is easy thank u i will do it :) QS = ã((-4+5)^2 + (3+4)^2) =ã50

*November 9, 2007*

**math**

i have a question in math (( distance between two points )) A quardilateral has vertices P(3,5), Q(-4,3), R(-3,-2), and S(5,-4). find the lengths of the diagonals,to the nearest tenth . please in detales .. thank u

*November 9, 2007*

**math**

why there is no one answer my question ?

*November 9, 2007*

**math**

hi i will ask u in math :) in (( distance between two points )) * three vertices of rectanglr WXYZ are W (4,3), X (-1,3), and Y (-1,-1), what sre the coordinates of Z ? ** two adjacent vertices of a square have coordinates (-1,-3) and (1,0), what are the possible coordinates ...

*November 9, 2007*

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