Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 60

**math**

4( x-2) metres of rope is used to fence this rectangular enclosure.Find x

**Statistics - Please help**

Here are the monsoon rains (in millimeters) for the 23 strong El Nino years between 1871 and 2004: 628 669 740 651 710 717 698 653 604 781 784 790 811 830 858 896 806 790 792 957 872 a. To make the stemplot of these rainfall amounts, round the data to the nearest 10, so that a...

**statistics**

El Nino and the mosoon. The earth is interconnected. For example, it appears that El Nino, the periodic warming of the Pacific Ocean west of South America, affects that the monsoon rains that are essential for agriculture in India. Here are the monsoon rains (in millimeters) f...

**Math**

If52 men can do a piece of work in 35days in how many days 28 men will do it?

**Math - 8th grade**

65 days

**physics**

If M and m are particles connected by light inextensible string. M is held at center and rotated about horizontal axis as M is in equilibrium.What is torque ABOUT ITS CENTER

**physics**

Two tugboats are towing a ship.Each exerts a force of 6000 N and the angle between two ropes is 60 degrees.What is the resultant force on the ship?

**Science Dr. Bob222**

I don't know how to find the specific heat in q1. I have q1 = 320 (specific heat) #2) How do I find heat vaporitzation for q2?

**Science**

Ten pounds of liquid water is at a temperature of 180 degrees F at standard atmospheric conditions. Determine the energy required to convert this to water vapor (steam) at a temperature of 212 degrees F.

**math**

A lawn sprinkler covers a rectangular pattern of 20ft x 30ft. 1)If the flow rate of the sprinkler is 2.5 gpm, derive a formula for calculating the time (hours) to apply D inches of water over one 20ft x 30ft area. 2)What are the units on the constant?

**math - help please**

A lawn sprinkler covers a rectangular pattern of 20ft x 30ft. If the flow rate of the sprinkler is 2.5 gpm, derive a formula for calculating the time (hours) to apply D inches of water over one 20ft x 30ft area. 2)What are the units on the constant?

**math**

A lawn sprinkler covers a rectangular pattern of 20ft x 30ft. 1)If the flow rate of the sprinkler is 2.5 gpm, derive a formula for calculating the time (hours) to apply D inches of water over one 20ft x 30ft area. 2)What are the units on the constant?

**algebra**

solve e^x / 3 = 5^x using logs.

**math**

A triangle has an angle whose sine is equal to sq rt 2/2. The angle is larger than 52 degrees in measure. Find the EXACT measure (in degrees) of the angle.

**Econ more help please**

See question below at **** Suppose local govt decides that a tax is the best way to address the inefficiency created by outdoor concerts. Assuming the social cost curve and the private cost curve are parallel to each other, how much does the tax on concerts have to be to achie...

**Econ - urgent please help**

Suppose local govt decides that a tax is the best way to address the inefficiency created by outdoor concerts. Assuming the social cost curve and the private cost curve are parallel to each other, how much does the tax on concerts have to be to achieve the socially optimal out...

**Econ please help**

Suppose local govt decides that a tax is the best way to address the inefficiency created by outdoor concerts. Assuming the social cost curve and the private cost curve are parallel to each other, how much does the tax on concerts have to be to achieve the socially optimal out...

**algebra**

Town has popultion of 5,000.Number of people infected after t days with a disease is N(t) = 5000/1 + 21.7e^-0.4t Find number initially infected find number infected after 12 days

**algebra **

Pa^t and Pe^rt are two forms of the same exponential function. One would expect to obtain the same answer for f(18). Explain why you may not get the same answer for f(18) in practice.

**math - another ? - exponentials**

The two formulas f(t) = Pa^t and f(t) = Pe^rt provide two models for the same exponential growth or decay function. How are the exact values of a and r related? (Hint: Find a formula for a as a function of r)

**algebra - exponentials**

Pa^t and Pe^rt are two forms of the same exponential function. One would expect to obtain the same answer for f(18) (after finding P and a and P and r). Explain why you may not get the same answer for f(18) in practice.

**algebra**

$7,000 is invested into two accounts: 4,000 into an account paying 5% interest compounded monthly and $3,000 into an account paying 4.1% interest compounded continuously. compute the total interest earned at the end of 2 years.

**Math - logs**

I need help solving this because it involves 2 bases: log (base 2) [log (base 5) 25]= ???

**algebra**

rectangular open-topped box is made from a 9 x 16 piece of cardboard by cutting x-inch squares out of each corner and folding up the sides. What size square should be cut out to produce a volume of 120 cubic inches?? I set it up with 120 = (16-2x)(9-2x)(x) I get to y = 2x^3 - ...

**Geometry**

2. This cone bottom tank is the perfect solution for transporting chemicals such as pesticides around to various locations. The cone shape of this plastic tank equips it not only for easy draining of materials, but also provides an easy cleaning process. a. What is the volume ...

**Geometry**

An engineer designed a 620 ft long water canal to drain a rainwater detention pond. It is to have a trapezoid cross-section that is 8 ft deep, 15 ft across the bottom, with walls sloping outward at an angle of 40. (a)Calculate the volume of earth that needs to be excav...

**Maths**

The fuel rods for a certain type of nuclear reactor are bundled into a cylindrical shell. Consider this cross-section showing 19 identical fuel rods: a) If the diameter of the one rod is 2.8cm, calculate the shaded area of the cross-section. b) If the length of the cylindrical...

**algebra**

So if the distance and height are reachable, why are these equations poor models of hitting a baseball: y = -0.5x^2 + 216x + 3 y = -0.002x^2 + 0.879x + 3.981 y = -0.002x^2 + 0.8732x - 3.981

**algebra**

why are these equations poor models of hitting a baseball: y= -0.002x(x-433.1) I get maximums of (216,93). Other problems' maximums are in the (220, 100)range. So are they poor models because the distance and heights are unreasonable? 2) Why is the constant a in y=ax^2 + b...

**algebra**

In a real-life situation, to model the distance x and the height of hitting a baseball y as in: y = ax^2 + bx + c 1. When dealing with the initial height of the ball, what is happening when x = 0? Is it that the ball has not yet traveled any distance? 2. What are the possible ...

**mba**

Find the maximum and minimum values of the following function. 8x3 – 75x2 + 150x

**physics**

What happens to the size of a hole in a metal plate when the plate is heated / cooled

**physics**

How do we compensate for thermal expansion /contraction in the construction of railway tracks? How do we compensate for thermal expansion /contraction in the construction of steel bridges? How do we compensate for thermal expansion /contraction in the construction of metal pip...

**physics**

Describe briefly how the volume of a given mass of water changes when it is cooled from 7 ^0 C to 1^0 C use the terms increase, decrease and maximum or minimum

**physics**

At what temperature is the density of water MAXIMUM ? Why does water have a maximum density ( Other liquids do not)

**physics**

A liquid expands on heating. Explain briefly how its density will change with rise in temperature

**physics**

liquids in general expand on heating but when water in an ordinary glass flask with a narrow neck is heated the level is found to first fall and then rise why ?

**physics**

Name Two solid materials having very low linear expansivity ?

**MBA – I/ Semester – I math**

Differentiate following with respect to x f(x) = (3x^2 – 5ax + a^2)^4

**physics**

What happens to the size of a hole in a metal plate when the plate is heated / cooled

**physics**

How do we compensate for thermal expansion /contraction in the construction of metal pipes for carrying steam?

**physics**

How do we compensate for thermal expansion /contraction in the construction of steel bridges?

**physics**

How do we compensate for thermal expansion /contraction in the construction of railway tracks?

**physics**

Describe briefly how the volume of a given mass of water changes when it is cooled from 7 ^0 C to 1^0 C use the terms increase, decrease and maximum or minimum

**physics**

At what temperature is the density of water MAXIMUM ? Why does water have a maximum density ( Other liquids do not)

**physics**

A liquid expands on heating. Explain briefly how its density will change with rise in temperature

**physics**

Name Two solid materials having very low linear expansivity ?

**physics**

liquids in general expand on heating but when water in an ordinary glass flask with a narrow neck is heated the level is found to first fall and then rise. why?

**MBA – I/ Semester – I math**

Differentiate following with respect to x. (3x2 – 5ax + a2)4

**mba**

Differentiate following with respect to x. (3x2 – 5ax + a2)4

**physics**

If velocity v of particle moving in straight line is related with distance travelled S as v=2(1+S)^1/2. Find the acceleration of the particle.

**physics**

A partical is projected vertically upward with speed 20 m/s. What will be the time after particle is at a height 15m above the ground( g=15 m/s*s)

**physics**

A non stop bus goes from one station to another at a speed of 54 km/h. The bus returns from the second station to first station at a speed of 36 km/h. Find the average speed of the bus.

**geometry**

find the equation to the plane through the point (-1,3,2) and perpendicular to the plane (x+2y+2z=5) and (3x+3y+2z=8)

**math**

first of all multiply 11 by 3 we get 33 now we add 1 to 33 , we get 34 so the result is - 34 / 3 the negative sign is with the whole term so it will remain with the whole fraction

**physics**

2.5 kg rifle fires a 20 g bullet at 400 m/s. Find magnitude of the recoil velocity of the rifle.

**physics**

Star Z has 1/5 the radius of Earth and 1000 times the Earth's mass. If a mass weighs 1.0 N on Earth, what does it weight on Star Z? Thank you.

**physics**

A chain of length l and mass ë per unit length is fully open and is held on a high frictionless table with y1 of its length hanging from the side of the table as shown in figure. When released, it starts slipping off the table. By calculating the speed of the chain as it ...

**physics**

A small stone of mass m is stuck on the periphery of a wheel of radius R rolling along the x-axis with a constant speed v. The centre of the wheel was at x = 0 at time t = 0, and stone was on the ground at that time. Find the angular momentum of the stone and its rate of chang...

**social studies**

1-b,2-c,3-c,4-d, 5-a, 6-b, 7-a

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