Saturday

October 25, 2014

October 25, 2014

Total # Posts: 66

**physics**

About the years 214-212 BC, the Greek philosopher and scientist Aρχιμηδηζ is said to have repelled a Roman attack with a "death-ray" concave mirror, using sunlight to set the approaching fleet on fire. Assume an early morning ...
*October 24, 2014*

**physics**

How far from a piece of paper must you hold your father’s 2.00 D reading glasses to try to burn a hole in the paper with sunlight?
*October 19, 2014*

**physics**

A laser that emits pulses of UV lasting 2.95 ns has a beam diameter of 4.05 mm. If each burst contains an energy of 4.60 J, what is the length in space of each pulse? What is the average energy per unit volume (the energy density) in one of these pulses?
*October 17, 2014*

**physics**

I solved the first question and got the right answer, but I just can't seem to get the correct answer for the second part. (a) An AM radio transmitter broadcasts 52.0 kW of power uniformly in all directions. Assuming all of the radio waves that strike the ground are ...
*October 16, 2014*

**Physics**

A laser that emits pulses of UV lasting 2.95 ns has a beam diameter of 4.05 mm. If each burst contains an energy of 4.60 J, what is the length in space of each pulse? What is the average energy per unit volume (the energy density) in one of these pulses?
*October 16, 2014*

**geometry**

if lineBC biscects angle ABD and angle ABC=5x+11 angle CBD=10x-4 then find x =
*October 13, 2014*

**Physics - Flux**

The coil has a radius of 8 cm and 110 turns. While moving the magnet farther away from the coil, at a certain point in time, the voltage meter shows -390 mV. What is the magnitude of the rate of change of the flux through the coil?
*October 10, 2014*

**Physics - Conducting Rails**

Two conducting rails 39.2 cm apart rest on a 4.11° ramp. They are joined at the bottom by a 0.520 Ω resistor, and at the top a copper bar of mass 0.0450 kg is laid across the rails. The whole apparatus is immersed in a vertical 0.580 T field. What is the terminal (...
*October 10, 2014*

**Physics II**

I figured out the answer for the first part. It is 5.9 m/s2... Still not sure how to get the answer to b though.
*October 2, 2014*

**Physics II**

A positively charged particle is moving with a velocity v in a large homogeneous magnetic field. (a) If the field is 4 mT, the mass of the particle is 33·10−9 kg, its initial speed 8.1 m/s, and its charge 6 μC, what is the magnitude of its acceleration? (in m...
*October 2, 2014*

**Physics II**

The force on the rectangular loop of wire in the magnetic field in the figure below can be used to measure field strength. The field is uniform, and the plane of the loop is perpendicular to the field. Justify the claim that the forces on the sides of the loop are equal and ...
*October 2, 2014*

**Algebra **

x= 3 + sqrt(3x-5)
*September 24, 2014*

**Algebra **

The power P (in watts) generated by a windmill that has efficiency E is given by the formula P = 0.31ED^2V^3, where D is the diameter (in feet) of the windmill blades and V is the wind velocity (in ft/sec). Approximate the wind velocity necessary to generate 30,000 watts if E...
*September 24, 2014*

**Algebra **

16x^4 + 65x^2 + 4 = 0
*September 19, 2014*

**Algebra**

The speed of the current in a stream is 4 mi/hr. It takes a canoeist 96 minutes longer to paddle 13 miles upstream than to paddle the same distance downstream. What is the canoeist's rate in still water?
*September 14, 2014*

**Physics**

What is the peak current through a 400–W room heater that operates on 120–V AC power?
*September 14, 2014*

**Physics**

A light–rail commuter train draws 635 A of 640–V DC electricity when accelerating. What is its power consumption rate in kilowatts? (in kW) 406 kW You are correct. How long does it take to reach 30.0 m/s starting from rest if its loaded mass is 4.90×104 kg, ...
*September 14, 2014*

**Physics**

The electric starter in an automobile equipped with a 12 V battery draws a current of 100.00 A when in operation. Suppose it takes the motor 4.00 s to start the engine. What amount of electric energy has been withdrawn from the battery? Answer: (in J) 4.80×103 J The ...
*September 14, 2014*

**Algebra**

Determine the value or values of d that complete the square for the expression. (Enter your answers as a comma-separated list. If there is no solution, enter NO SOLUTION.) (a) x^2 + 7x + d d = b) x^2 − 18x + d d = (c) x^2 + dx + 64 d = (d) x^2 + dx + 49/4 d =
*September 13, 2014*

**Algebra**

Steve, Sorry for my mistake on the PI, I was in a hurry. But I placed the answer you provided and it's wrong?
*September 12, 2014*

**Algebra**

I posted this earlier but the number was wrong. I don't know why it didn't post the other pie symbol. And ofcourse the extra pie throws me off! A large grain silo is to be constructed in the shape of a circular cylinder with a hemisphere attached to the top (see the ...
*September 12, 2014*

**Algebra**

A large grain silo is to be constructed in the shape of a circular cylinder with a hemisphere attached to the top (see the figure). The diameter of the silo is to be 30 feet, but the height is yet to be determined. Find the height h of the silo that will result in a capacity ...
*September 12, 2014*

**College Algebra**

A boy can row a boat at a constant rate of 5 mi/hr in still water, as indicated in the figure. He rows upstream for 24 minutes and then rows downstream, returning to his starting point in another 16 minutes. (Round your answers to two decimal places.) (A) Find rate of the ...
*September 12, 2014*

**Math **

Write each percent as a fraction in simplest form. 2 2/5%=?
*August 21, 2014*

**World Civilization**

As an immediate result of the Battle of Trafalgar,
*August 21, 2014*

**math**

Ryan was trying to figure out how many column millimeters his advertisement would require. He wanted to sell his motorcycle as quickly as posible, so he was including a picture. If the picture was the width of a column and four centimeters long, how many millimeters of text ...
*February 23, 2014*

**Physics**

two blocks are connected by a light rope over a pulley fixed at the edge of a table such that bloc A, 16kg is a the table top and block B, 8kg is hanging by the edge. block A is acted upon by a mass of 200N acting towards the center of table surface. the coefficient of kinetic...
*April 8, 2013*

**math**

Find the derivative of the function f by using the rules of differentiation. f(x)=7x^4/3-2/3x^3/2+2x^2-5x+1 f '(x) = ??
*March 1, 2013*

**math**

Find the derivative of the function f by using the rules of differentiation. f(x) = x^4 - 4x^2 + 3 f '(x) =??
*March 1, 2013*

**Math**

Find the derivative of the function f by using the rules of differentiation. f(u)=10/ãu f '(u) = ??
*March 1, 2013*

**math**

The relationship between the temperature in degrees Fahrenheit (°F) and the temperature in degrees Celsius (°C) is F=(9/5)C+32 (b) What is the slope of the line? ?? What does it represent? (a) It doesn't represent anything. (b)It represents the constant increase in...
*February 26, 2013*

**math**

The owner of a luxury motor yacht that sails among the 4000 Greek islands charges $430 per person per day if exactly 20 people sign up for the cruise. However, if more than 20 people (up to the maximum capacity of 90) sign up for the cruise, then each fare is reduced by $4 per...
*February 26, 2013*

**math**

Consider the supply equation where x is the quantity supplied in units of a thousand and p is the unit price in dollars. p=x^3+x+10 Determine the price at which the supplier will make 2,500 units of the commodity available in the market. (Give your answer correct to the ...
*February 25, 2013*

**accounting**

Which of the following statements is incorrect? a. The normal balance of accounts receivable is a debit. b. The normal balance of an expense account is a credit. c. The normal balance of the owner's capital account is a credit. d. The normal balance of unearned revenues is...
*February 8, 2013*

**math**

Given the equation 2x + 10y = 10, answer the following questions: If x decreases by 2 units, what is the corresponding change in y? ? units
*February 8, 2013*

**math**

The percent of homes with digital TV services, which stood at 6% at the beginning of 1999 (t = 0) was projected to grow linearly so that at the beginning of 2003 (t = 4) the percent of such homes was projected to be 28%. (a) Derive an equation of the line passing through the ...
*February 8, 2013*

**math**

If the line passing through the points (a, 1) and (5, 7) is parallel to the line passing through the points (8, 8) and (a + 2, 1), what is the value of a? a =?
*February 8, 2013*

**math**

Given the equation 2x + 10y = 10, answer the following questions: If x decreases by 2 units, what is the corresponding change in y? ? units
*February 8, 2013*

**Chemistry**

What is a Balanced equation for sulfur (IV) oxide (g) and magnesium oxide (cr)?
*February 3, 2013*

**math**

Find the area of the region under the graph of the function f on the interval [4, 10]. f(x)=10x-5 ? square units
*November 30, 2012*

**math**

The demand function for a certain brand of CD is given by the following equation where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. p=-0.01x^2-0.1x+6 Determine the consumers' surplus if the wholesale ...
*November 30, 2012*

**math**

The management of Ditton Industries has determined that the daily marginal revenue function associated with selling x units of their deluxe toaster ovens is given by the following, where R '(x) is measured in dollars/unit. (a) Find the daily total revenue realized from the...
*November 30, 2012*

**math**

The demand function for a certain brand of CD is given by the following equation where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. P=-0.01X^2-0.1X+6 Determine the consumers' surplus if the wholesale ...
*November 28, 2012*

**Math**

The demand function for a certain brand of CD is given by the following equation where p is the wholesale unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. P=-0.01X^2-0.1X+6 Determine the consumers' surplus if the wholesale ...
*November 28, 2012*

**math**

Find the present value of $26997.18 due in 3 yr at an interest rate of 10%/year compounded continuously. $ ?
*November 27, 2012*

**math**

Find the present value of $26997.18 due in 3 yr at an interest rate of 10%/year compounded continuously. $?
*November 27, 2012*

**math**

Find the present value of $26997.18 due in 3 yr at an interest rate of 10%/year compounded continuously. $?
*November 27, 2012*

**math**

Find the effective rate corresponding to the given nominal rate. (Round your answer to the nearest hundredth of a percentage point.) (a) 7%/year, compounded daily % (b) 6%/year, compounded monthly %
*November 27, 2012*

**science physics **

When all forces acting on an object are combined together, what's the result known as
*February 28, 2012*

**Math**

Brain Teaser 85=the A N to be E from the W M P
*December 15, 2011*

**Physics**

29.53 m/s^2
*September 17, 2011*

**Math**

im doing a math word scramble and i cant unscramble the following: AHLSSNET GIRLTEAHING OUOETRRSAQ GTEERNARTHA ICARLAFTO UNTOEGRNC LUQSEA VITSEIOP UNRLERPADECPI REAORDDRIE ENITMELGENS Help me. Due tomorrow by the time i get to Ms. Bladys class
*August 16, 2011*

**English **

Explain the problems with this statement. Antigone said: "But I will bury him: and if I must die, I say that his crime is holy: I shall lie down with him in death, and I shall be as dear to him as he to me" (Sophocles 57-60)
*June 12, 2011*

**algebra 1**

|\ | \ x | \ 10 |_ _\ 6 Pythagorean theorem: a^2 + b^2 = c^2 here you are looking for a so.. a^2 + 6^2 = 10^2 a^2 + 36 = 100 100 - 36 = 64 square root of 64 is 8 a= 8ft
*May 27, 2011*

**Logarithms**

log4(10)=x Im having trouble getting started here with this question thanks
*May 24, 2011*

**English**

Speculation regarding.
*February 18, 2011*

**math**

Find the area bounded by the parabola y^2=4x and the line y=2x-4. Use vertical representative rectangles (integrate with respect to x) and horizontal representative rectangles (integrate with respect to y). the answer is 9 square units ... i just need to know how to get to that.
*December 15, 2010*

**College Calc 1**

Find the area bounded by the parabola y^2=4x and the line y=2x-4. Use vertical representative rectangles (integrate with respect to x) and horizontal representative rectangles (integrate with respect to y). the answer is 9 square units ... i just need to know how to get to that.
*December 15, 2010*

**chemistry**

If the initial concentration of AB is .250 M, and the reaction mixture initially contains no products, what are the concentrations of A and B after 75s?of XY after 5.0 X10^1s?
*February 21, 2010*

**Writing**

Never mind. I'm going to change my topic.
*November 19, 2009*

**Writing**

I am working on a research paper, and wanted to go with the theme of how social stigma prevents people with mental illnesses to seek help. However, I need to have include an opposing argument, and I don't think I will be able to find a strong opposing view. All I've ...
*November 19, 2009*

**math riddle ALGEBRA WITH PIZZAZZ**

thank you soooo much!!!!
*April 6, 2008*

**science**

The thermal energy of volcanoes and natural hot springs comes from trace amounts of radioactive minerals in common rock in the Earth's interior. Why isn't the same kind of rock at the Earth's surface warm to the touch?
*January 30, 2008*

**science**

Turn an incandescent lamp on and off quickly while you are standing near it. You feel its thermal energy but find when you touch the bulb that it is not hot. why you felt thermal energy from it.
*January 30, 2008*

**science**

In a mixture of hydrogen and oxygen gases at the same temperature, which molecules move faster? Why?
*January 30, 2008*

**math**

740 rounede to the tens
*April 22, 2007*

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