Wednesday

July 30, 2014

July 30, 2014

Total # Posts: 648

**Physics**

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

**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?

**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

**math**

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

**physical Science**

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

**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 inelast...

**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?

**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?

**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?

**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)

**math**

how to find the volume when two figures are used?

**Physics**

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

**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...

**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

**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?

**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?

**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?

**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.

**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.

**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 wo...

**Business **

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

**algebra**

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

**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.

**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.

**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

**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

**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?

**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 f...

**Physics**

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

**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?

**ALGEBRA**

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

**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.

**math**

subtract and simplify 3/4 minus 5/8

**business communication**

if i had to guess i would choose a.

**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...

**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 m...

**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 pr...

**business communication**

i agree with you ms. sue

**business communication**

im guessing it has to be c.

**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.

**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 in...

**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 accel...

**Algebra**

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

**Physics 3**

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

**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?

**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.

**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

**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

**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?

**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 !

**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 w...

**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?

**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.

**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.

**science**

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

**physics**

displacement for walking 100m east than 125m west

**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

**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.

**trig**

find the value of x when: x= 5 log base 2 (1/16)+ 8 log base 3 (27)

**Oceanography**

How much heat must be added to turn 3 grams of water at 100°C into a vapor and what will be the final temperature after this much heat is added

**physics**

A child is pushing a shopping cart at a speed of 1.5 m/s. How long will it take this child to push the cart down an aisle with a length of 9.3 m?

**science**

How is potiential evaporation measured?

**physical science**

A rocket blasts off. In 10.0 seconds it is at 10,000 ft, traveling at 3600 mph. Assuming the direction is up, calculate the acceleration. 5280 ft/sec2 528 ft/sec2 100 ft/sec2 100. ft/sec2

**physical science**

A rock tied to a string is swung around in a circle at a constant speed of 25 ft/sec. The length of the string is 1.765 ft. Calculate the acceleration. = _____ . 354.1 ft/sec2 350 ft/sec2 14.16 ft/sec2 14 ft/sec2

**physical science**

A weight attached to a wire is swung in a circular path. Its speed is 12 meters/sec, and it has a centripetal acceleration of 9.0 meters/sec2. Calculate the diameter of the circle. 1.3 meters 2.6 meters 16 meters 32 meters

**physical science**

While traveling south on an expressway, a car traveling 60 mph (miles per hour) slows down to 30 mph in 12 minutes due to traffic conditions. Calculate the acceleration. = -2.5-6.0-150-450 mi./hr2 NSWEn/a

**physical science**

If a car goes along a straight road heading east and speeds up from 45 ft/sec to 60. ft/sec in 5 sec, calculate the acceleration. = Note: If the speed were given in miles per hour, and the time were given in minutes, you could change the minutes to a fraction of an hour and do...

**physical science**

If a car goes along a straight road heading east and speeds up from 45 ft/sec to 60. ft/sec in 5 sec, calculate the acceleration. = 3-3 ft/sec 2 NESn/aW Note: If the speed were given in miles per hour, and the time were given in minutes, you could change the minutes to a fract...

**physical science**

A rock tied to a string is swung around in a circle with a radius of 10 ft. The centripetal acceleration is 16.9 ft/sec2. Calculate the speed of the rock.

**physical science**

A car slams on its brakes, coming to a complete stop in 4.0 sec. The car was traveling north at 60.0 mph. Calculate the acceleration.

**physical science**

A car goes around a curve (the arc is part of a circle with a radius of 25 ft.) with a speed of 20.0 ft/sec. What is the magnitude of acceleration?

**physic**

How do you find the average speed?

**Physics**

Calculate the work done by non conservative forces of a hockey stick hitting a tennis ball using elastic potential energy, and kinetic energy if the mass of the ball is 0.058kg and the ball is shot at 34m/s for .41s and travels 5.09m, and the hockey stick bends 0.10m.

**Ethics **

I am so tired of seemingly educated students not knowing how to form complete sentences or spell. If you really want to make an impression, or even get anyone to read the posts, take the time to act like someone who's opinion is something we want to consider. In other word...

**Geometry**

Thanks

**Geometry**

A 4-in. by 6-in. drawing is enlarged to put on a poster that measures 20 in. by 24 in. What are the dimensions of the largest possible enlargement?

**world geography **

007690RR, 007691, 007692, 007693 pls help me. penn foster exam for world geography.

**world issuse**

Passage

**Alkaline Dry Cell**

I need to be able to label all parts of battery

**trig**

In triangle XYZ, angle X = 90°, angle Y = 38°, and z = 4'5". Find y

**chem**

You have a series of four chemical reactions (1 2 3 4). How do you calculate the H2 if you know the other H values?

**chem**

Two hundred grams of a substance requires 0.52 kJ of heat to raise its temperature from 25°C to 45°C. q = mCT. Mass (m) is in grams. Temperature is in degrees Celsius.

**Chem**

What is the change in enthalpy when 250 g of steam condenses at 100oC? (Hv = 40.67 kJ/mol)

**chemistry**

calculate the mass, in grams, of NaCl present in each of the following solutions. 6.25 g of 11.5% NaCl solution 452 g of 12.3% NaCl solution please show me how to do these. Thanks.

**chemistry**

how does an ionic solute dissolve in water?

**chemistry**

It was that easy. I think I was trying to make it harder than it was. Thanks for the help

**chemistry**

A hexane solution contains as impurities 5.2% (by mass) hepatne and 2.9% (by mass) pentane. Calculate the mass of each component present in 93g of the solution.

**world history**

How total was the transformation brought about by the industrial revolution?

**math**

assume that the edge of a square is 1 unit add squares to this shape so that it has a perimeter of 18

**geometry**

Find the area of a pentagon ABCDE with verticles A(0,4),B(3,2),C(3,-1), D(-3,-1) and E (-3,2)

**geometry**

Find the area of a pentagon ABCDE with verticles A(0,4),B(3,2),C(3,-1), D(-3,-1) and E (-3,2)

**Chemistry**

what role does barometric pressure play in the boiling point of water?

**stressed and unstressed syllables**

how do you know a stressed or unstressed syllable

**math**

For the set X={m,n.p,q,r,s}, let R be the relation on P(X) (power set) given by A R B iff A and B have the same number of elements. List all the elements in {m}/R (equivalence class); in {m,n,p,q,r,s}/R. How many elements are in X/R? How many elements are in P(X)/R?

**math**

define the concept of sampling error

**health**

What would be the risk od a young healthy person choosing a managed care plan,

**Chemistry**

N2O4(g) 2 NO2(g) The ΔH° for the reaction above is +57.2 kJ. The system is initially at equilibrium. Which of the following changes will favor the reverse reaction? NO2 is removed. N2O4 is removed. A catalyst is added. The temperature is increased. The temperature is ...

**5th grade math**

I need help with this problem ! 5 2/5 - 3 4/5= ? 6 1/10 - 3 4/10 = 10 - 4 2/5= ? PLEASE! SHOW ME EACH PROBLEM STEP BY STEP SO , I CAN FINISH MY HOMEWORK! THANK YOU!

**math**

Use the Generalized PMI to prove: 2^n > n^2, for all n > 4 First of all, it's true for n=5. Then to prove it for n+1... Assume 2^n > n^2. Then 2^(n+1) = 2*2^n > 2*n^2 > 2*(4n) since n>4 => n^2>4n I'm stuck there.

**math 4th grade**

each student brought in 9 cans to recycle. write an equation to represent the total number of cans (c)for any number of students(s)

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