Tuesday

December 1, 2015
Total # Posts: 243

**Physics**

explain the concept of electric potential difference in terms of work done in transferring the charge
*April 13, 2011*

**Chemistry I**

If the theoretical yield of a reaction is 0.173g and the actual yield is 0.165g , what is the percent yield?
*April 9, 2011*

**Statistics**

A computer manufacturer is about to unveil a new, faster personal computer. The new machine clearly is faster, but initial tests indicate there is more variation in the processing time. The processing time depends on the particular program being run, the amount of input data, ...
*March 25, 2011*

**Physics**

A patient has a far point of 34.6 cm and a near point of 26.0 cm. What power (in diopters) should be prescribed to give the patient normal vision for: (a) contact lenses? 1) D (b) glasses which are worn 0.9 cm away from the patient's eyes? 2) D
*February 14, 2011*

**management**

Given the following amount of work in seconds required at each station: _____________________ A 38 J 32 X 22 B 34 K 30 Y 18 C 35 L 34 Z 20 a. What is the possibility daily output of this “process” if 8 hours of processing time is available each day?
*January 30, 2011*

**4th grade math**

you find out
*January 10, 2011*

**4th grade math**

help!
*January 10, 2011*

**4th grade math**

53
*January 10, 2011*

**4th grade math**

thank you
*January 10, 2011*

**criminal justice**

what are 2 major influencing factors and how dose federal sentencing guidelines have an effect on these influences
*November 30, 2010*

**chemistry**

what is the molecular mass of a solute if a solution containing 150 g of that solute and 1.0 kg of water has a boiling point of 102.0 degree c? (Kb= 0.512 degree C/m)
*November 28, 2010*

**Math**

there are a lot of them but i chose 1, 4, 8,10
*November 15, 2010*

**physics**

A long jumper jumps with the initial velocity of 12.0 m/s at an angle of 20 degrees. what is the displacement of x?
*November 5, 2010*

**Pearson**

0.0195
*November 4, 2010*

**math**

The carpenter wants to make a dresser based on the dollhouse furniture. The scale is 5\2in : 1ft. The height of the dollhouse is 10in. What is the height of the carpenter's dresser.
*November 3, 2010*

**math**

A building 35ft tall casts a shadow 105ft long .Patty casts a shadow 16.5 ft long. how tall is Patty?
*November 3, 2010*

**math**

thank you !!!
*November 3, 2010*

**math**

A fence post 3ft tall casts a shadow 16ft long . At the same time ,the barn casts a shadow 96ft long. how tall is the barn?
*November 3, 2010*

**calculus**

Find the formula for the described function and state its domain. An open rectangular box with a volume of 8 cubic meters has a square base. Express the surface area of the box as a function of S(x) of the length x of a side of the base.
*October 27, 2010*

**algebra**

what is the average height of a softball that is pitched to a batter from 45 feet away?
*October 19, 2010*

**5th grade SCIENCE**

Why is a short curcuit called a short curcuit?
*October 18, 2010*

**Math**

The answer according to the calculator is 15.What I think the answer is 45.
*October 18, 2010*

**Chemistry**

If 920 mL of 0.0402 M aqueous LiOH reacts stoichiometrically according to the balanced equation, what mass (g) of gaseous CO2 is required? 2 LiOH(aq) + CO2(g) → Li2CO3(aq)
*September 28, 2010*

**chemistry**

How many {\rm NO}_{2} molecules would form as products if the reaction had a percent yield of 75\%?
*September 20, 2010*

**college physical science**

jdjdj
*September 6, 2010*

**math**

t over 30
*September 1, 2010*

**geometry**

How much foil is required to cover a rectangular box that is 4in. by 8in. by 5in.? use 3.14 as an aproximation for pi. where appropriate.
*July 17, 2010*

**geometry**

in triangle abc angle b is 3 times angle a and angle c is 8degrees less than 6 times angle a?
*July 6, 2010*

**Geometry**

A regular hexagon is made from equilateral triangle by cutting along the dotted lines and removing the three smaller triangles. if triangle has a perimeter of 18, what is the perimeter of hexagon?
*June 10, 2010*

**english**

underline complete subject and complete pedicate to my sentences. The boys and girls studied different kinds of measures.
*May 26, 2010*

**Geometry**

Lines l and m have an intersection at point O and any reflection in l followed by a reflection in m results in a rotation about point O of 136 degrees. What is the acute angle between l and m? Thank you!!
*May 15, 2010*

**math**

how to work out the answer to 0.08 divided by 0.7, it dividing decimals
*April 16, 2010*

**Physics**

Two Q = +6.72 mC charges are placed at opposite corners of a square d = 1.5 m on each side, and -Q = -6.72 mC charges are placed at the remaining corners, as shown in the figure. Q___________-Q | | | | | | | | -Q__________Q
*April 8, 2010*

**6th grade**

what is the LCM of 8,and 19
*March 25, 2010*

**physics**

n a physics lab experiment, a spring clamped to the table shoots a 21 g ball horizontally. When the spring is compressed 20 cm , the ball travels horizontally 5.2 m and lands on the floor 1.5 m below the point at which it left the spring.
*March 23, 2010*

**physics - PLEASE HELP**

A person whose eyes are H = 1.62 m above the floor stands L =2.24m in front of a vertical plane mirror whose bottom edge is 43 cm above the floor. What is the horizontal distance x to the base of the wall supporting the mirror of the nearest point on the floor that can be seen...
*March 8, 2010*

**physics**

A piano tuner hears one beat every 2.8 s when trying to adjust two strings, one of which is sounding 440 Hz, so that they sound the same tone. How far off in frequency is the other string?
*February 10, 2010*

**accounting**

what is the quality of the disclosures for guarantees and commitments for nortel networks corporation? and could these disclosures be improved?
*January 29, 2010*

**Physics - Momentum**

A ball of mass m makes a head-on elastic collision with a second ball (at rest) and rebounds with a speed equal to one-third its original speed. What is the mass of the second ball?
*December 10, 2009*

**Physics - Momentum**

A child in a boat throws a 5.60 kg package out horizontally with a speed of 10.0 m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 22.0 kg and that of the boat is 55.0 kg.
*December 9, 2009*

**MATH**

Joe bought 2 dozen eggs at the store. On the way he dropped the eggs and broke 3/4 of them. How many eggs broke?
*December 8, 2009*

**MATH**

Carmen spent 4 hours at the Y on Saturday. Two thirds of that time she spent in the gym. How many hours did she spend in the gym?
*December 8, 2009*

**home economics**

what are ten careers in home economics
*December 4, 2009*

**Physics Work and Energy**

A 55 kg trampoline artist jumps vertically upward from the top of a platform with a speed of 5.5 m/s. (Ignore small changes in gravitational potential energy.) (a) How fast is he going as he lands on the trampoline, 3.0 m below? (b) If the trampoline behaves like a spring of ...
*November 23, 2009*

**Physics - Work and Energy**

Jane, looking for Tarzan, is running at top speed (3.6 m/s) and grabs a vine hanging vertically from a tall tree in the jungle. How high can she swing upward? Does the length of the rope matter?
*November 16, 2009*

**accounting**

Question 2.) Hawkeye Electric Company engaged in the following transactions during July. July 2 – Purchased inventory for cash, $800 July 5 – Purchased store supplies on credit terms of net eom, $600. July 8 – Purchased inventory of $3,000, plus freight charges ...
*November 11, 2009*

**phyics-universal gravity**

Calculate the force of gravity on a spacecraft 6400 km (1 earth radii) above the Earth's surface if its mass is 1600 kg.
*November 3, 2009*

**Pre- Caluculus**

Find the time at which the depth of the water in the tank is eual to half its initial depth. D(t)=sqrt(100-2t) the tank is empty when t=50 min
*October 21, 2009*

**social studies**

What is the province of Charlottetown Canada?
*October 14, 2009*

**physics**

A window washer pulls herself upward using the bucket-pulley apparatus. The mass of the person plus the bucket is 69 kg.How hard must she pull downward to raise herself slowly at constant speed?If she increases this force by 11 percent, what will her acceleration be? There is ...
*October 13, 2009*

**Physics**

okay well i am confused about the way you can figure out the acceleration if the tension is increased by 11%
*October 13, 2009*

**Physics**

no since there is only one pulley then there is only one rope and if there is only one pulley and one rope there is only one tension
*October 13, 2009*

**Physics**

to get T would you just do 69(9.8)
*October 13, 2009*

**physics**

A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.15 and the push imparts an initial speed of 3.9 m/s?
*October 13, 2009*

**physics**

A box weighing 69 N rests on a table. A rope tied to the box runs vertically upward over a pulley and a weight is hung from the other end. Determine the force that the table exerts on the box if the weight hanging on the other side of the pulley weighs one of the following: a)...
*October 8, 2009*

**Physics - HELP please**

A 24.0 kg box (m1) rests on a table.(b) A 13.0 kg box (m2) is placed on top of the 24.0 kg box, as shown in Fig. 4-35. Determine the normal force that the table exerts on the 24.0 kg box. Determine the normal force that the 24.0 kg box exerts on the 13.0 kg box.
*October 8, 2009*

**Physics - HELP please**

A 24.0 kg box (m1) rests on a table.(b) A 13.0 kg box (m2) is placed on top of the 24.0 kg box, as shown in Fig. 4-35. Determine the normal force that the table exerts on the 24.0 kg box. Determine the normal force that the 24.0 kg box exerts on the 13.0 kg box.
*October 8, 2009*

**physics**

what if there are no passengers? for max force i got 330 and for the min force i got 165
*October 8, 2009*

**physics**

An elevator (mass 4125 kg) is to be designed so that the maximum acceleration is 0.0400g. What is the maximum force the motor should exert on the supporting cable? What is the minimum force the motor should exert on the supporting cable?
*October 8, 2009*

**physics - forces**

A person pushes a 16.0 kg lawn mower at constant speed with a force of 70.0 N directed along the handle, which is at an angle of è = 45.0° to the horizontal. Calculate the force the person must exert on the lawn mower to accelerate it from rest to 1.2 m/s in 2.0 ...
*October 8, 2009*

**physics**

A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235 m below. The plane is traveling horizontally with a speed of 280 km/h (77.8 m/s). (b) Suppose, instead, that the plane releases the supplies a horizontal distance of 425 m in advance of ...
*September 27, 2009*

**physics**

A rescue plane wants to drop supplies to isolated mountain climbers on a rocky ridge 235 m below. The plane is traveling horizontally with a speed of 280 km/h (77.8 m/s). (b) Suppose, instead, that the plane releases the supplies a horizontal distance of 425 m in advance of ...
*September 26, 2009*

**physics**

An airplane is heading due south at a speed of 515 km/h. A wind begins blowing from the southwest at a speed of 100 km/h (average). (Hint: First draw a diagram.) (a) What is the velocity (magnitude and direction) of the plane relative to the ground? magnitude/direction (east ...
*September 26, 2009*

**physics**

A hunter aims directly at a target (on the same level) 120 m away. (a) If the bullet leaves the gun at a speed of 290 m/s, by how much will it miss the target? (b) At what angle should the gun be aimed so the target will be hit?
*September 26, 2009*

**physics**

A car is driven 105 km west and then 30 km southwest. What is the displacement of the car from the point of origin (magnitude and direction)?
*September 21, 2009*

**chemistry**

what is the molarity of the solution which contains 5.0g of NaOH(formar weight=40g/mole)dissolved in water to make 200 ml of soluitons?
*September 4, 2009*

**physics**

positive
*September 3, 2009*

**social studies 7th grade**

what was the name of the school
*August 27, 2009*

**social studies 7th grade**

School from old times that would hit kids stick if they talked back or out of turn if they had messy work they would hit them
*August 27, 2009*

**math?**

thats why the answer not 3^2^280 I am not understanding the answer you dont multiply 3*2=6^80
*August 16, 2009*

**math?**

In the second problem why do I put a 1 before 2^80?
*August 16, 2009*

**math?**

Simplify each of the following, if possible. Write your answers in exponential form, a^b 3^4*3^7*3^6 2^80+3*2^80
*August 16, 2009*

**people**

Many years ago, a cruise liner sank in the middle of the Pacific Ocean. The survivors luckily landed on a remote desert island. There was enough food for the 220 people to last three weeks. Six days later a rescue ship appeared, unluckily this ship also sank, leaving an ...
*July 27, 2009*

**english**

Which of the following is the best opening sentence for a business letter that you want to sound fairly informal? A. I am in receipt of your order of February 10. B. This letter is to make you cognizant of our receipt of your order. C. Your order of February 10 arrived in our ...
*February 28, 2009*

**statistics**

The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, and 10. a. Compute the mean for this sample. Show your work!! b. Compute the range for this sample. Show your work!! c. Compute the variance for this sample. Show your work!! d. Compute the ...
*February 14, 2009*

**science**

measurement of an average classroom door is closest to 1 meter
*February 12, 2009*

**science**

measurement of an average classroom door is closest to 1 meter
*February 12, 2009*

**math**

What is the difference between a expression and a equation?
*January 9, 2009*

**math**

Find the vertex of y = −3(x + 1)2 + 5 Find the vertex of y = −2t2 + 12t − 23
*November 20, 2008*

**math**

never mind
*November 20, 2008*

**math**

Use the rule of Logarithm, then solve for x Log 2x+1 - log (x+5)=0 x=4 *I know x equals for can you explain how?
*November 20, 2008*

**Criminal Justice 200**

How would one define crime and how would on say if it is consenus or conflict?
*November 18, 2008*

**Criminal Justice 200**

How would you define crime control and due process model. And which one would you consider effective?
*November 15, 2008*

**college**

I am stuck with this question. Which system would one believe in and more effective control model or due process model.
*November 15, 2008*

**algebra**

5x=7+4y 20x-16y=28 how many solutions are there for the system of equations? Infinitely many solutions No solution. two solutions or three solutions?
*October 5, 2008*

**Algebra 1: 8th Grade**

Any hot girls want to halla at pretty boy. ''It's Dj and I know you can see that, I'm a pretty rich dood, and all the boys wanna be that''.
*September 22, 2008*

**Math**

Write 1024 as a power of 4.
*September 13, 2008*

**Computer**

i need a image of a diskette with this sizes: size 8 size 5 1/4 size 3 1/2 (maybe they are size inches) i search and search and search but i cant find them please i will pass this on monday thx! Jiskha rock!
*August 7, 2008*

**math**

1/4x-1/6y=-2 -1/6x+1/5y=4 solve for x and y its suppose to be x equals 12 and y equals 30 need steps thanks
*July 21, 2008*

**math**

Thank you Reiny you really help me.
*May 15, 2008*

**math**

please can someone help me with this problem. I am doing substitution. 3x + 4y = 0 y = x you have to substituted the y for x Then the same other problem with different number. y = x -6x + 8y = -2
*May 15, 2008*

**math**

A grocery store has a gallon of milk for $2.30. They also have a 4 litter container of milk for $2.30. Which is the better buy and why? Please somebody help me with this question? So far I did Gallon 1 = x liter 3.79 4 4 = 3.79x cross out divide 3.79 3.79 x=1.055 gallon
*April 20, 2008*

**science**

Austin took a shower from 7:56 to 8:08 and used sixty gallons of water. Assuming the same rate of water usage, how much water would Austin have saved if he had taken a quick six-minute shower? help
*April 18, 2008*

**science**

why do we celebrate earth day? is it important to celebrate earth day?
*April 18, 2008*

**social study**

what were two purposes of the mounds built by the mound builders? please help me with this question
*April 17, 2008*

**science**

In an ecosystem, some species become so adapted to each other that neither could survive without the other. Name one species and describe how it has become so adapted to organisms of another species that it could not survive without them. someone please help me with this ...
*April 13, 2008*

**science**

can someone please help me with this question. Give me an example of a jellyfish and a eagle body plan or internal structures. Then explain what is a body plans and internal structures for animal.
*April 11, 2008*

**science**

Thank you for your help?
*April 10, 2008*

**science**

Can someone help me with this question please? explain how earth naturally recycles carbon dioxide.
*April 10, 2008*

**science**

Identify two effects of tectonic plate movement. then explain how tectonic plate movement cause each of the effects you identified. Please someone help me with this question . The one effect I can think of is they form mountains and volcano but i don't know if it right or ...
*April 8, 2008*