Tuesday

February 21, 2017
Total # Posts: 889

**PHYSICS**

1. A 500.0 g metal block absorbs 1.125 × 104 J of heat to raise its temperature by 50.0 K. What is the substance?

*June 5, 2012*

**PHYSICS**

If you increase the distance between two identical point charges so that the new distance is five times the original distance, what happens to the force between them? I know it is suppose to be divided by 25 but why?

*June 4, 2012*

**maths**

Five members of staff had their till sales analysed. Andrew scored higher than Amanda who didn`t have the lowest score. Angela had the highest score and Sally scored more than David but less than Andrew. Who had the lowest score?

*June 4, 2012*

**Physics**

Before a nuclear reaction, there is 0.01000 kg of uranium. After the nuclear reaction, there is 0.00950 kg of uranium. How much energy was released? (h = 6.63 × 1034 Js)

*June 1, 2012*

**Physics**

Two objects are near a bar magnet. One is about 1 cm away, while the other is 6 cm away. Compare and contrast the magnetic force that affects each object. What do they want me to do?

*May 27, 2012*

**Physics**

The minimum frequency for the photoelectric effect of a zinc plate is 9.7 × 1014 Hz. What will be the kinetic energy of an ejected electron when a photon with a wavelength 200 nm (2.00 × 10 7 m) strikes it?

*May 27, 2012*

**Honors Physics Question**

Two objects are near a bar magnet. One is about 1 cm away, while the other is 6 cm away. Compare and contrast the magnetic force that affects each object. What do they want me to do?

*May 27, 2012*

**PHYSICS**

A coil with an area of 0.10 m2 is in a magnetic field of 0.20 T perpendicular to its area. It is flipped through 180° so that the part that was up is down. The flip takes 1.0 s. Estimate the average induced emf between the ends of the coil while it is being flipped. What ...

*May 27, 2012*

**PHYSICS**

A straight 1.2 m length iron rod is moved at 10 m/s through the earth's magnetic field at a location where it has magnitude 1.0 × 105 T. What is the magnitude of the induced emf between one end of the wire and the other end? What formula do I use?

*May 27, 2012*

**physics**

A wire loop has an area of 0.12 m2, and the magnetic field through it increases from 0 to 0.20 T in 0.30 s. What is the induced emf in the loop?

*May 27, 2012*

**Physics**

According to Boyle's law, the volume V of a gas at a constant temperature varies inversely with the pressure P. When the volume of a certain gas is 125 cubic meters, the pressure is 20 psi (pounds per square inch). If the volume of gas is increased to 400 cubic meters, the...

*May 25, 2012*

**physics**

current through a device is 0.30 A, and the resistance in the device is 40 Ù. How many 1.5 V batteries are required to run the device

*May 24, 2012*

**Physics**

each resistor in the circuit shown is 5.0 Ù, and the battery is 12.0 V, what does the second ammeter (A2) read?

*May 24, 2012*

**Change boring verb and ordinary adjectives**

bill get angry with his sister

*May 23, 2012*

**physics**

A boy drops a 0.10 kg stone down a 150 m well and listens for the echo. The air temperature is 20°C. How long after the stone is dropped will the boy hear the echo? The speed of sound through air at 20°C is v = 343 m/s.

*May 21, 2012*

**Lost in Physics**

The strength of an electric field at 5.0 cm from a point charge is 100.0 N/C. What is the magnitude of the source charge? Show work so I understand how to do it. E=kQ/r^2 solve for Q, you have r, E What do I do NOW? I am lost

*May 19, 2012*

**Physics**

Calculate the force between a +5 µC test point charge and this source charge at a distance of 2.00 cm. (µC = 1.0 × 10–6 C) force=kq1q2/r^2 Have the formula now what do I do?

*May 19, 2012*

**Physics**

A 5.0 µC point charge is moved within an electric field and has an electric potential energy change of 10.0 J. What is the electric potential difference before and after the charge was moved? Show work. (µC = 1.0 × 10–6 Vq=energy so delta V must be 10 ...

*May 19, 2012*

**Physics**

If the test charge were moved closer to the source charge, would the change in its potential energy be positive, negative or zero? Explain.

*May 19, 2012*

**Physics**

Calculate the force between a +5 µC test point charge and this source charge at a distance of 2.00 cm. (µC = 1.0 × 10–6 C)

*May 19, 2012*

**Physics**

A 5.0 µC point charge is moved within an electric field and has an electric potential energy change of 10.0 J. What is the electric potential difference before and after the charge was moved? Show work. (µC = 1.0 × 10–6 C)

*May 19, 2012*

**Physics**

If I knew how to do it with formula I would have done it.

*May 19, 2012*

**Physics**

The strength of an electric field at 5.0 cm from a point charge is 100.0 N/C. What is the magnitude of the source charge? Show work so I understand how to do it.

*May 19, 2012*

**chem**

What volume of a 2.5 M stock solution of acetic acid (HC¿HÀO¿) is required to prepare 100.0 milliliters of a 0.50 M acetic acid solution?

*May 10, 2012*

**Math**

Determine the total amount of interest you will pay over the next 3 months on a credit balance of $725 if your credit card has an annual interest rate of 18% and you make monthly payments of 10% of the amount due, rounded to the nearest dollar.

*May 7, 2012*

**Chemistry**

When a mixture of sulfur and metallic silver is heated, silver sulfide is produced. What mass of silver sulfide is produced from a mixture of 3.0 g Ag and 3.0 g S8? 16 Ag(s) + S8(s) > 8Ag2S(s)

*May 6, 2012*

**Chemistry**

yes

*May 6, 2012*

**Chemistry**

This is all the info I have DrBob222 I don' have a solubility table. It doesn't say how much solution either,huh, is this something that can be answered?

*May 6, 2012*

**Chemistry**

Thank you DrBob222 for your help!

*May 6, 2012*

**Math**

A spinner is divided into 20 equal sections and are numbered 1 through 20. What is the probability of the spinner's pointer landing on section 5?

*May 5, 2012*

**Math**

In 2004, your family bought a new car for $15,000. Each year the value of the car is decreasing approximately 15% per year. Your father plans to keep the car 5 years before he buys another new car. What will be the value of the car when he's ready to trade? What is the ...

*May 5, 2012*

**english**

which of the following is a simple sentence? a)karen and david arrived at the airportat 3:35pm and took a taxi to their hotel b)i went to the airport ,but i was too late to meet them

*May 1, 2012*

**social studies**

Which of the following statements should not be included in the general principles of self-evaluation in a child care facility? A. The knowledge that a self-evaluation is taking place should be restricted to the program director. B. Self-evaluation should take place at regular...

*April 30, 2012*

**statistics**

A TV pollster believes that 75% of all TV households would be tuned in to Game 6 of 1997 NBA Championship series between the Chicago Bulls and the Utah Jazz. A sample of 1000 TV households was selected and 722 indicated they were tuned into the game. Find the Standard Error ...

*April 18, 2012*

**Math**

$1000 in a savings bond on the day you were born. The bond pays 6% interest compounded annually. How much is it worth in 18 yrs? I know it earns $60 a yr. but I am lost after that.

*April 18, 2012*

**statistics**

A TV pollster believes that 75% of all TV households would be tuned in to Game 6 of 1997 NBA Championship series between the Chicago Bulls and the Utah Jazz. A sample of 1000 TV households was selected and 722 indicated they were tuned into the game. Find the point estimate ...

*April 17, 2012*

**Math**

You invest $7,000 in a two-year CD. At the end of the 2 years, you receive $8,331.97. Assume you left the first year' s interest in the account, what was your yearly interest rate?

*April 10, 2012*

**English**

Reminds me of movie and a book I read!

*April 10, 2012*

**accounting**

Please explain periodic inventory by three methods

*March 27, 2012*

**statistics**

The time it takes Jessica to bicycle to school is normally distributed with an average of a third of an hour and a variance of 9 minutes. Jessica has to be at school at 8:15 am. What time should she leave the house so she will be late on 5% of the time?

*March 27, 2012*

**statistics**

An agricultural economist is interested in determining the average diameter of peaches produced by a particular tree. A random sample of 50 peaches is taken and the sample mean calculated. Suppose that the average diameter of peaches on this tree is known from previous years&#...

*March 26, 2012*

**statistics**

the dean of admissions in a large university has determined that the scores of the freshman class in a mathematics test are normally distributed with a mean of 86 and a standard deviation of 11. A sample of 50 students is selected at random from the entire freshman class. ...

*March 26, 2012*

**Physics**

You have a 2.00 kg block of lead. Lead melts at 327.5°C. CPb = 130.0 , and ï„Hf for lead is 2.04 Ã— 104 J/kg. Say you start at room temperature (25.0°C). How much heat must you transfer to melt all the lead?

*March 18, 2012*

**math**

if one boy runs 2 3/5 miles a day for 4 days and another boy runs 10 miles in 4 days who runs further?

*March 15, 2012*

**Physics**

A 500.0 g metal block absorbs 3.25 × 103 J of heat to raise its temperature by 50.0 K. What is the substance? Please show steps because I have several problems like this and then I can see where I am goibg wrong

*March 12, 2012*

**math**

what is rule for a function table that has input/output 12/0 20/2 32/5 52/10

*March 8, 2012*

**physical Science**

t=(v-vo)/a v=100m/sx10 a=9.81m/sx2

*February 29, 2012*

**Physics**

3. A 0.200 kg air-track glider moving at 1.20 m/s bumps into a 0.600 kg glider at rest. a.) Find the total kinetic energy after collision if the collision is elastic. .144J I got that one. b.) Find the total kinetic energy after collision if the collision is completely ...

*February 28, 2012*

**chemistry 111**

in calibrating your thermometer by setting only the freezing and boiling points, what assumptions are you making regarding the internal diameter of the thermometer and the expansion of the thermometer fluid?

*February 26, 2012*

**Math**

The Robinsons decide they would rather purchase the $85,000 home. Their bank requires a 5% down payment to be paid to the seller and a payment of 1 point (1%) of the mortgage at the time of closing. How much is the down payment?

*February 25, 2012*

**statistics**

If the means for our groups on calories consumed a day were Group A = 2000, Group B = 2500, and Group C = 3000 could we just assume that all of the groups had statistically different means? How could we determine which groups were significantly different from each other?

*February 24, 2012*

**chemistry**

Calculate the number of moles in each of the following: 0.150 g of salicylic acid 0.30 mL of acetic anhydride (density = 1.08 g/mL)

*February 24, 2012*

**math**

how to find the volume when two figures are used?

*February 20, 2012*

**Physics**

I am still lost! I understand the formula I just don't know what numbers to put where.

*February 12, 2012*

**Physics**

A girl places a stick at an angle of 60.0° against a flat rock on a frozen pond. She pushes at an angle and moves the rock horizontally for 2.00 m across the pond at a velocity of 4.00 m/s and a power of 160.0 W. What force did she apply to the stick? How much work did she...

*February 12, 2012*

**Physics**

A man weighing 700 N lifts a 50.0 N object 2.0 m high. He uses a lever and with a force of 10.0 N. What is the resistance force

*February 7, 2012*

**Physics**

A rowboat passenger uses an oar to push the boat off the dock by exerting a force of 60.0 N for 2.0 s. What impulse acts on the boat?

*January 29, 2012*

**statistics**

Suppose that the mean score of an exam was 77 when taken 30 students took it on time with a standard deviation of 2. A makeup of the same exam is given to 6 students. The retakes averaged a score of 83 with a standard deviation of 2.9. What is the average of the test scores?

*January 28, 2012*

**statistics**

Suppose that the mean score of an exam was 77 when taken 30 students took it on time with a standard deviation of 2. A makeup of the same exam is given to 6 students. The retakes averaged a score of 83 with a standard deviation of 2.9. What is the average of the test scores?

*January 28, 2012*

**Physics**

A 44 kg child jumps off a 2.2 kg skateboard that was moving at 8.0 m/s. The skateboard comes to a stop as a result. Find the speed at which the child jumped from the board. Show all your work. Assume a frictionless, closed system.

*January 27, 2012*

**Physics**

Explain why a rapidly spinning gyroscope, mounted in a frame that allows it to rotate in any direction independently of the frame’s rotation, tends to maintain its axis pointed in the same direction in space.

*January 27, 2012*

**Physics**

A 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. Find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earth’s velocity. Earth’s mass is 6.0 × 1024 kg. Show all your ...

*January 27, 2012*

**Business**

How many years would it take for money to triple in value at 20% per year simple interest?

*January 25, 2012*

**algebra**

simplify and reduce this fraction 21m/11m+12 - 10m-12/11m+12

*January 17, 2012*

**Physics**

Summarize two observations that are contrary to the predictions based on Newton’s laws but that confirm Einstein’s explanation of gravity. Indicate how the predictions based on Newton’s theory differ from Einstein’s.

*January 11, 2012*

**Physics**

A 6.0 kg block of ice rests on a surface that is tilted by = 12°. Find the acceleration of the block ignoring any friction.

*January 11, 2012*

**Physics**

A ball is thrown horizontally from a platform so that the initial height of the ball is 6.0 m above the level ground below. The ball lands 24 m from its original horizontal location. Find how fast the ball was thrown. Show work i just don't understand

*January 11, 2012*

**Physics**

A ball is thrown horizontally from a platform so that the initial height of the ball is 6.0 m above the level ground below. The ball lands 24 m from its original horizontal location. Find how fast the ball was thrown. Show work i just don't understand

*January 11, 2012*

**Physics**

You drive your car 2 km to the gas station, 4 km to the shopping mall to let your mother off, and 4.5 km back home. The trip takes 20 min. What is your velocity in m/s?

*January 9, 2012*

**Physics**

Cheryl runs a race on a 400.0 m circular track. She starts running east of the starting line and then circles the track and falls, stopping 1.00 m west of the starting line. Her time is 80.0 s. What was her average velocity? I know the correct answer is -1.25 x 10-2 m/s. But ...

*January 9, 2012*

**Physics**

A car travels 10.0 m/s. What is its velocity in km/h?

*January 8, 2012*

**Physics**

A 70.50 kg man rides a Ferris wheel with a radius of 10.3 m at a velocity of 5.00 m/s. What is the centripetal force that she experiences expressed with the correct number of significant figures?

*January 8, 2012*

**ALGEBRA**

Why are there two possible answers to an absolute value equation?

*November 28, 2011*

**Physics**

A 12 kg barrel is pulled up by a rope. The barrel accelerates at 1.2 m/s2. Find the force exerted by the rope. Show all your work.

*November 21, 2011*

**math**

subtract and simplify 3/4 minus 5/8

*November 15, 2011*

**business communication**

if i had to guess i would choose a.

*November 7, 2011*

**business communication**

Which of the following is not a good guideline to follow when writing to international audiences? a. write in the reader's language if you have any knowledge of the language at all; doing so greatly increases goodwill, even if you make mistakes. b. Be aware that the reader...

*November 7, 2011*

**business communication**

im choosing between b or c. costs are generally mentioned near the end of the body and are connected to specific benefits. c. shows generally, the price is not mentioned until the last fourth of the message, after the content makes the audience want the product. according to ...

*November 6, 2011*

**business communication**

The exact price of the product should be mentioned: a. early in the letter, as soon as the offer is first mentioned. b. in the middle of the letter, as soon as benefits are first mentioned. c. in the last fourth of the letter, after the copy makes the reader really want the ...

*November 6, 2011*

**business communication**

i agree with you ms. sue

*November 5, 2011*

**business communication**

im guessing it has to be c.

*November 5, 2011*

**business communication**

i know its not a my text states that a series of questions can be an effective opener. i know b is wrong is well because startling statements can be used to capture a readers attention so im leaning on choice c or d.

*November 5, 2011*

**business communication**

effective openers to a sales letter may include all of the following except: a. a series of questions that intrigues the reader and gets her thinking. b. a starting statement that captures the reader's attention. c. a direct suggestion that the reader purchase a new and ...

*November 5, 2011*

**Physics**

A bicyclist is coasting down a road that is sloped downward at an angle of 8°. The bicycle and bicyclist have a total mass of 80 kg. If the bicycle wheels roll freely, without any effect from friction or air resistance slowing the motion, how fast would the bicyclist ...

*November 3, 2011*

**Algebra**

Is the square root of 362-a real number, irrational number, rational number, integer, whole number and or counting number?

*October 23, 2011*

**Physics 3**

9x^2y-7,3x^3

*October 20, 2011*

**physics**

A 23- bullet traveling 230 penetrates a 3.6 block of wood and emerges cleanly at 170 . If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges?

*October 14, 2011*

**math**

Urn I and urn II each have two red chips and two white chips. Two chips are drawn simultaneously form each urn. Let X1 be the number of red chips in the first sample and X2 the number of red chips in the second sample. Find the pdf of X1+X2.

*October 9, 2011*

**physics**

A man walks 15m north then 20m at 32° E of N and then 11 m at at 15° S of W determine his net displacement

*September 28, 2011*

**physics**

A man walks 15m north then 20m at 32° E of N and then 11 m at at 15° S of W determine his net displacement

*September 28, 2011*

**ALGEBRA2**

HAS THE CONTENT in this course allowed you to think of math as a useful tool? if so how? what concepts investigated in this course can apply to your personal and professional life? in what ways did you use my mathlab for extra support?

*September 25, 2011*

**English**

to settle an argument.. is it correct to hyphenate She will be placed into a short-leg walking cast? I say yes! Thank you !

*September 22, 2011*

**English**

Similarly, on the left ear, the eardrum, itself, did not appear infected and we simply talked about watching the number of infections that pop up this winter, as well as our potential need to replace tubes, if the infections become too bothersome or frequent. I cannot change ...

*September 21, 2011*

**English**

I have asked her family to let me discuss this with our cochlear implant team to see if this would be a reasonable option from their perspective. Is cochlear implant team capitalized?

*September 21, 2011*

**English**

She does need preferential seating in the front of her classes, which she is not getting in history currently. Is "history" capitalized in this sentence.

*September 21, 2011*

**Geometry**

Referring to the figure below (not to scale), the perimeter of the rectangle is 48. The length of the rectangle is W + 6, where W is the width. Find the length.

*September 14, 2011*

**science**

talking on your cell pohon e in your beddroom, when suddenly the reception goes bad for a minute

*September 13, 2011*

**physics**

displacement for walking 100m east than 125m west

*September 3, 2011*

**Accounting**

March 3 Inventory units 60 per unit $1,500 total $90,000 March 8 Purchase 120 units $1,800 per unit total $216,000 March 11 Sal units 80 per units $5,000 total $400,000

*August 28, 2011*

**trig**

If a, b are the solutions of the equation log base 3 (5-2x)+ log base 3 (5+2x)=2 find the value of the product ab.

*August 26, 2011*