# Posts by bob

Total # Posts: 3,272

**physics**

A ball of mass m = 0.75 kg is thrown straight upward with an initial speed of 8.9 m/s. Plot the gravitational potential energy of the block from its launch height, y = 0, to the height y = 5.0 m. Let U = 0 correspond to y = 0. Determine the turning point (maximum height) of ...

**physics**

A ball of mass m = 0.75 kg is thrown straight upward with an initial speed of 8.9 m/s. Plot the gravitational potential energy of the block from its launch height, y = 0, to the height y = 5.0 m. Let U = 0 correspond to y = 0. Determine the turning point (maximum height) of ...

**geometry**

What Is The Area Of A Circle If The Radius Is 10 Inches?

**art101**

1. CheckPoint: Greek and Roman Architecture • Resource: Ch. 15 of A World of Art • Write a summary comparing the characteristics and innovations of each Greek and Roman architecture in 200 to 300 words. • Provide two representative examples of architecture for ...

**College Electric Physics**

(a) What is the electric potential energy in joules of two electrons separated by 1.98 nm? (b) What would be it be if the separation was doubled?

**Physics**

A sprinter accelerates at 4 m/s2 for 3 seconds, and then runs the rest of the race at a constant speed. If the race is 100 m, how much time does the sprinter take to fi nish the race?

**Algebra**

What is the area of a circle whose diameter is given by the expression 10x?

**math**

Forrest Lumber uses the function S(t) = -75t + 375 to determine the salvage value S(t), in dollars, of a table saw t years after its purchase. How long will it take the saw to depreciate completely?

**math**

Samantha can ride her bike to work in 2/3 of an hour. When she drives to work it takes 1/3 of an hour. If she drives 12 miles per hour faster than she rides her bike, how fast does she ride her bike?

**English 1**

tgfrvh,ki

**English 1**

do your own work

**math**

two girls caught 25 frogs. lisa caught four times as many as jen did. how many frogs did jen catch

**MATH**

a golf ball dropped onto a hard surface rebounds exactly 1/3 of the height from which it falls. how far will it rebound after hitting the surface for the third time if it initially dropped from a height of 18 feet

**math**

two girls caught 25 frogs. Lisa caught four times as many as Jen did. how many frogs did Jen catch

**math**

company claims 10% are green. suppose that candies are packaged randomly into samll bags of 50. school children studying percent open several bags, count colors and find the proportion that are green. a. is the Normal model appropriate here? explain b. where is the center? ...

**Science**

the candy nerds

**Science**

what about nerds

**math**

51/17

**algebra 1**

5m-m+8+=0

**science**

I have the same question. Did you figure out the answer?

**Math**

simplify: 5-s(4-7)+3s show steps

**Chemistry**

If Kc = 0.143 at 25°C for this reaction, find the equilibrium concentrations of C6H12 and CH3C5H9 if the initial concentrations are 0.200 M and 0.075 M, respectively. a. [C6H12] = 0.041 M, [CH3C5H9] = 0.041 M b. [C6H12] = 0.159 M, [CH3C5H9] = 0.116 M c. [C6H12] = 0.241 M...

**Pre-Algebra**

I don't get it because the choices are A. 25 mins B. 35 mins C. 85 mins D. 1500 mins

**Pre-Algebra**

Cheng drives 25 miles on a highway at a constant rate of 60 miles per hours. Jow much time does the trip take?

**math**

n + (n + 1) + (n + 2) =45

**computers**

When you press the power button on your computer, it doesn’t turn on. There is nothing…silence…absolute zero. There are no beeps, no whistles, nothing. The monitor is getting power and the power strip is turned on. 1.Draw a diagram of the wiring scheme based on ...

**algebra**

The force of gravity is inversely proportional to the square of the center of the earth. if you weigh 120 lbs on the surface of the earth, how much would you weigh 250 miles above the surface? (Earth's radius = 4000 miles)

**4th grade math**

38 is the answer

**science**

object weighs 40 N on earth's surface. it would weight on 10 N when its distance from earth's center is doubled halved tripled or quadrupled thankyou

**science**

object weighs 40 N on earth's surface. it would weight on 10 N when its distance from earth's center is doubled halved tripled or quadrupled thankyou

**Math**

3p^2+4P^2=63

**Math**

3p^2+4P^2=63

**math**

3p^2+4P^2=63

**Math**

The distance between the points (14,-18) and (15,-8) is? The point (a,b) is such that (14,-18) is the midpoint of the segment from (15,-8) to (a,b). Then a and =?

**chemistry**

Nevermind, the correct answer was at the top of the next page so I didn't see it.

**chemistry**

Nope, it was 10 degrees C, which is why I'm stumped. I didn't think any of the answer choices were right, either.

**chemistry**

Which of the following constants are needed to calculate the change in enthalpy (H) for heating a sample of liquid water at 10C to steam at 150C. I) the heat capacity of water II) the enthalpy of fusion of water III) the heat capacity of ice IV) the enthalpy of ...

**chemistry**

thanks

**chemistry**

I think that's what I'm looking for.

**chemistry**

I, IV and V only 005 10.0 points When a chemical reaction comes to equilibrium, both the forward and the reverse reactions continue, but their rates are equal. For such a system at equilibrium at 300 K and 1.00 atm pressure, the change in Gibbs free energy as the forward ...

**math**

if a triangle has side lengths of 6cm, 9cm and x cm, what are possible values for x?

**physics**

I'm sorry I meant 1.5J

**physics**

The answer is 15J

**MATH**

A is the midpoint of BC. BA=2x+5 and BC=5x-3. solve for x and find the length of BC

**physics**

20

**math**

Gloves down

**honors chemistry**

no, that is what i meant to type, that's just the question on my homework

**honors chemistry**

Which gas has solubility in water (at STP) of 3.39 L at 10.0°C?

**9th grade algebra**

The sum of two numbers is 90.their difference is 18.find the numbers.

**science**

if earth is one astronomical unit from the sun and has a period of 1 year, approximately how far is planet X form the sun if it has a period of 26 yearS

**Iron and Sulphur reaction**

iron+sulfur(or sulphur)=FeS

**math**

Dents and Dings Auto Body buys paint with a list price of $29,000. If the supplier extends trade discounts of 30/35/20, what is the trade discount amount?

**Chemistry**

CO2 (g)

**chemistry**

In one mole of the compound nitrogen diox- ide, what fraction of the total number of ions is the nitrogen ion?

**Math**

write a formula that gives you the number of regions formed when x points are placed on a circle and all possible chords are drawn. ex. 2pts has 2 regions, 3pts has 4 regions, 5pts has 17 regions

**math**

??????

**Physics**

A 10 kg crate is pulled up a rough incline with an initial speed of 1.5 m/s. The pulling force is 86 N parallel to the incline, which makes an angle of 30 ° with the horizontal. Assuming the coefficient of kinetic friction is 0.4 and the crate is pulled a distance of 7.5 ...

**trig**

what is the value of the discriminant x^2-9

**Physics 12th Grade**

Two girls with masses of 50.0 kg and 70.0 kg are at rest on frictionless in-line skates. the larger girl pushes the smaller girl so that the latter rolls away at a speed of 10.0 m/s. What is the effect of the action on the larger girl? What is the impulse that each girl exerts...

**chemistry**

A solution of ethanol (C2H5OH) in water is prepared by dissolving 87.4 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this solution?

**Geometry**

Find the surface area of a right octagonal pyramid with height 2.5 yards, and its base has apothem length 1.5 yards.

**Physics**

990 N

**GENERAL ART**

HOW DO YOU DRAW 3 D BOXES

**7th Pre-Algebra Word Problem**

Thanks

**7th Pre-Algebra Word Problem**

Approximately one-seventh of the people in the United States are left-handed. The population of the United States is about 300 million. Write and solve an equation to estimate howmany people in the United States are left handed.

**Physics**

Two brothers are jogging, Josh and Drake. Josh has 1/2 the KE of Drake. Also, he is twice the mass of Drake. Plus, Josh had to increase his speed by 1.35 meters/second to achieve the same kinetic energy of Drake. What is the initial velocity?

**Math**

prove that two triangles are congruent if they have 2 equal adjacent angles and the side inbetween them is also the same.

**math**

find three rational numbers between the negtive square root of 26 and the negtive square root of 15 and explain how you got the answer

**Math**

prove that two triangles are congruent if they have 2 equal adjacent angles and the side inbetween them is also the same.

**high school**

1400n

**math**

Find the range of possible measures if each set of expressions represents measures of the sides of a triangle:x 2x+10, x+8

**Language arts**

Figurative language

**geometry**

Write and solve an inequality to find the calues of x for which the area of the rectangle is greater than the are of the triangle

**11th grade**

20xsquared+40 x+15=0

**algebra**

Thanks

**algebra**

10-d=19 What is d? I think it is -9.

**Physics**

6000

**math**

how do you solove I=$440 P=??? R=7% T=4 years

**7th grade**

i need help with another I=$440,P=??,R=5%,T=4 years what is p

**7th grade**

thank you

**7th grade**

I=$440 P??? R=7% T=4years this is simple interest

**7th grade**

i need help with simple interest math homework.NOW!

**History**

dont go down really don't go i mean it

**Finance**

The extent to which inventory financing may be used depends on

**finance**

At age 5, how much would you have to save per month to have $1 million in your account at age 65, if your investment rate was 10% per year? Assume no taxes and compounding on a monthly basis.

**trig**

solving radical equations... help! 5+¡în+1= n+4

**science 6thgrade**

What?

**Math**

12 Quarters 7 Dimes 3 Nickels

**Math**

12 quarters 7 dimes 3 nickels

**Math question**

pi*r^2 3.14*20cm.^2 =1256.63 take that and divide by four and you get 314.16

**physics**

I have a capacitance of 5.75e-10 What is it in Farads?

**pre algebra 6th grade**

250=x-.08x 250=(1-.08)x 250/(1-.08)=x 271.73=x

**algebra**

x=4 y=2 perimeter= (2*4)+(2*2) = 8+4 =12

**Physics**

I need help solving for q. Here is the formula. F=(k*q*2q)/r^2

**Geometry**

h=(2A)/B =(2*6.75)/3 =4.5 m

**bio 102**

assuming the standard values for the atmospheric partial pressure of N2, O2, AND CO2 at sea level, what is the approximate total partial pressure of the remainig atmospheric gases?

**Chemistry**

0.500 moles of NOCl is placed in a 1.00L vessel at 700K,and after the system comes to equilibrium,the concentration of the NOCl is .440M. Calculate the value of Kc for the reaction @NOCl(g)->2NO(g)+Cl2(g)?

**math**

what is the ascending order of 8+7x^2-12x^3-4x^3y

**100000000 grade**

1000000000000000000000000000000000000000000000000000000000000000000000000000000 ways

**chemistry**

What is the formula for the compound formed when potassium reacts with nitrogen?