# Posts by Avi

Total # Posts: 24

**Civil engineering**

Prove varignons theorem , with ex pls

**math**

a well of diameter 3 m is dug 14 m deep . the earth taken out of it has beem spread evenly all around of it in the shape of circular ring of width 4 m to form embankment. find the height of embankment .

**gems**

The sum of present age of father nd son is 82 .when the father age was equal to the present age of son .the sum of their age is46.find their present age

**science**

Hey, my question is: The rope of a swing is 3.30 m long. Calculate the angle from the vertical at which a 94.0 kg man must begin to swing in order to have the same KE at the bottom as a 1550 kg car moving at 1.57 m/s (3.51 mph) Thanks !

**math**

1200 tiles

**chemistry**

A saturated solution of NaCl (dissolved in water) has a concentration of 4.01 M at a given temperature. The solution has a volume of 1 L (1000 mL). If the water were to evaporate until the volume of the solution is 500 mL (and then stirred), what would the concentration of ...

**calculus**

Sand falls from a conveyor belt at a rate of 20 m^3/min onto the top of a conical pile. The height of the pile is always 3/4 of the base diameter. Answer the following. a.) How fast is the height changing when the pile is 10 m high? Answer = m/min. b.) How fast is the radius ...

**calculus**

A girl flies a kite at a height of 200 ft, the wind carrying the kite horizontally away from her at a rate of 4 ft/sec. How fast must she let out the string when the kite is 422 ft away from her? Answer = ft/sec.

**calculus**

Two commercial airplanes are flying at an altitude of 40,000 ft along straight-line courses that intersect at right angles. Plane A is approaching the intersection point at a speed of 429 knots (nautical miles per hour; a nautical mile is 2000 yd or 6000 ft.) Plane B is ...

**calculus**

A 13 ft ladder is leaning against a house when its base begins to slide away. By the time the base is 3 ft from the house, the base is moving at the rate of 5 ft/sec. Answer the following: At what speed is the top of the ladder sliding down the wall at that time? Answer = ft/...

**calculus**

The length l of a rectangle is decrasing at a rate of 5 cm/sec while the width w is increasing at a rate of 2 cm/sec. When l = 15 cm and w = 7 cm, find the following rates of change: The rate of change of the area: Answer = cm^2/sec. The rate of change of the perimeter: Answer...

**calculus**

When a circular plate of metal is heated in an oven, its radius increases at a rate of 0.02 cm/min. At what rate is the plate's area increasing when the radius is 100 cm? Answer = _______ cm^2/min

**calculus**

The voltage V (volts), current I (amperes), and resistence R (ohms) of an electric circuit are related by the equation V=IR. Suppose that V is increasing at a rate of 3 volt/sec while I is decreasing at a rate of 1/8 amp/sec. Let t denote time in seconds. Determine the rate at...

**Chemistry**

A student dried a wet crucible with a kimwipe. A piece of kimwipe was left clinging to the inside wall of the crucible. The student did not see the piece of kimwipe when adding the NaHCO3-KCl mixture to the crucible. The crucible and its contents were weighed and subjected to ...

**university mathematics**

Integration Applications: find the area enclosed by the following curves:- Y= lnx and y= -2x+3 and the ordinate x=3

**Physics**

A force of 10N applied normal to the wall can just prevent the sliding of a wooden block. If co-efficient of static friction is 0.2.Find the weight of the body.

**physics**

Can you help me

**Math 5th**

i need help in a hurry!!!!!!! I need to know what the fractions-one half and so on until one fourth us equal to bye tomrrow!!!!!!!!!!! please help!! :)

**4th grade nouns**

circle the words that the speaker feels as he tells his big plans content indifferent motivated tranquil enthusiastic excited

**4th grade nouns**

circle the words that the speaker feels as he tells his big plans

**accountancy**

The ledger accounts of M Ltd. show the following balances: Rs. 14% Preference share Capital 3,00,000 Securities Premium 20,000 Investment Allowance Reserve 50,000 General Reserve 80,000 Profit and Loss Account 38,600 The company redeems preference shares at a premium of 10% by...

**biology**

True false I think it true

**chem**

Classify each of the follwing by the type of solid(molecular, ionic, metallic, covalent network)it will form: a) Na b) Fe c) SiO2 d) H2O E) KF The result that I got are : a) Na (ionic solid) b) Fe (metalic solid) c) SiO2 (covalent network) d) H2O covalent network)) E) KF (...

**Chemis**

Of the floowing compound, which would you exoect to have the lowest vapor pressure at room temperature: CHCl3 CH2Cl2 CH3Cl CCl4 From my result I think it is CH3cl beacuse of the dispersion force it has the lowest force

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