# Posts by kelly

Total # Posts: 1,793

**Calculus**

f(x)= 1/x, x greater than 7 3x, x less than or equal to 7 Find f(7t)

**mechanics**

An empty railway wagon of mass 4500kg travelling at 15m/s collides with a stationary loaded wagon of mass 2400kg. The empty wagon bounces backwards at 4m/s. a) Find the velocity of the loaded wagon after the collision (answer was 3.49m/s) b) Find the kinetic energy lost in the...

**Thermal physics**

when breathing slowly a person inhales air at room temperature and exhales it at body temperature. We may assume that the lungs maintain ordinary atmospheric pressure as they expand. If a resting person inhales 0.6L of air at 24 degrees what volume does the air occupy when it ...

**Pharmacy**

1.This section of a monograph would tell you if the drug were soluble in water. a.description b.how supplied c.clinical pharmacology d. dosage and administration 2. Information on how to treat a patient who has taken a toxic dose of a medication would be found in this section ...

**Biology**

advantage and disadvantage of respiring anaerobically?

**Biology**

what is the relationship between the amount of starch and maltose present during starch hydrolysis.

**Biology**

is starch present at time zero? should it be present? why or why not?

**Biology**

another way to word: the effects of temperature on human and fungal amylase

**ENGLISH**

CAN YOU UNSCRAMBLE THIS WORD THABIAT

**Chemistry**

What volume of 0.123 M AgNO3(aq) is needed to form 0.657 g of AgCl(s)? 0.564 mL. 18.6 mL. 37.2 mL. 1.77 L.

**trig**

find the 5 other trig functions if cos(theta) = square root of 2/2 and cotangent is less than 0

**trig**

find the 5 other thrig functions if cos(theta) = square root of 2/2 and cotangent is less than 0

**Chemistry**

Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.

**Chemistry**

Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.

**Chemistry**

Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.

**Math**

123:45

**Math**

make the first cut at 6cm and the second at 22cm. You will have 3 pieces that measure 6cm, 16cm and 48cm.

**Chemisty**

Im totally lost on how to do redox reactions. Can any one show me the steps on how to do MnO4-1 +C7H60 => Mn2 +c7H6O2? im trying to study for a test and im totally lost. thanks in advanced.

**science**

why is it advantageous for the stomach to be below the diaphragm rather than above it

**japenese**

what does furasosu mean?

**calculus**

Sorry, I don't understand your reply... This question has a prime after the f by the way. It's f prime, aka the derivative. That's why the function is decreasing.

**calculus**

f'(x) < 0 if |x| < 1 And apparently this means f is decreasing on (-1, 1). I don't understand this. I know f'(x) < 0 means the function is decreasing. But I don't understand the absolute value. It means I can put -1 or 1 inside, but wouldn't it ...

**6th grade**

which eurasian republic is the largest

**chemistry**

A 0.26 M solution of a diprotic acid, itaconic acid, has an [H+] of 6.0 10-3 M. What is the value of K1? I got answer like 2.6 10-1 ,I am not realy sure if u help me C5H6O4--> C5H5O4 + H+ K1 is constant

**Chemistry**

A sample of argon gas has a volume of 715 mL at a pressure of 1.34 atm and a temperature of 144 Celsius. What is the volume of the gas in milliliters when the pressure and temperature of the gas sample are changed to 622 mmHg and 321 K?

**chemistry**

how many joules are required to heat a frozen can of juice (360 grams) from -5C (the temperature of an overcooled refrigerator to 110C) the highest practical temperature within a microwave oven?

**Chemistry**

What mass of Zn will be dissolved in 10 mL pH=2 HCl solution? Zn + 2HCl--> ZnCl2 + H2

**physics problem**

At body temperature the latent heat of vaporization of water is Lv = 2.26e3 kJ/kg. (a) A naked person with a surface area A = 1.55 m2 and a skin temperature = 37.3 degrees is in a sauna room at T = 82.0 degrees. The person's skin has an emissivity e = 0.910. She evaporates...

**grammar**

why are great numbers of students choosing to pursue their college degrees using their homw computers. Benjamin Franklin Said; A penny saved is a penny earned". This principle applies to the american and foreign online student. Today students choose to take online courses...

**Physics ptoblem**

At body temperature the latent heat of vaporization of water is Lv = 2.26 ¡Ñ 103 kJ kg−1. (a) A naked person with a surface area A = 1.55 m2 and a skin temperature £c = 37.3 ¢XC is in a sauna room at T = 82.0 ¢XC. The person's skin has an...

**Physics**

The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 13 g nail when it is struck by a 550 g hammer moving with an initial speed of 4.0 m/s. I solved for the final velocities of both and got 3.8 m/s ...

**Physics**

3.8 m/s for the hammer*

**Physics**

The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 13 g nail when it is struck by a 550 g hammer moving with an initial speed of 4.0 m/s. I solved for the final velocities of both and got 3.8 m/s ...

**Physics**

Thanks! i was so close to that equation i just wasn't moving my total mass to the left side.

**Physics**

Suppose now that the air carts below are both moving to the right initially. The cart to the left has a mass m1 and an initial speed v0; the cart to the right has an initial speed v0/2. If the center of mass of this system moves to the right with a speed 6/7 v0, what is the ...

**trigonometry**

solve graphically. Estimate to the nearest tenth if the roots are not integers. x^2 y^2 --- + ---- =1 9 4 3x-2y=6

**college physics**

The energy difference between states A and B is twice the energy difference between states B and C (C > B > A). In a transition (quantum jump) from C to B, an electron emits a photon of wavelength 300 nm. What is the wavelength emitted when the photon jumps from B to A? ...

**Document and visual design**

correct

**Document and Visual Design**

30. transparencies. you can write on them like dry erase boards and they are displayed on a wall like a poster. like visual or whatever 32. dry erase boards. you have to usually mount them on a wall for the class to see before you use it.

**Physics**

A 150.0 g aluminum cup is filled with 450. g of water at 95℃. The combination cools uniformly by 1.20℃ per minute. At what rate (J/s) is thermal energy being removed from the combination?

**math**

This isn't a specific math question. I'm just looking for some tips for my calculus midterm tomorrow. I'm terrible at math and I can't seem to "think outside the box" in order to do problems correctly. I know my stuff but if a teacher throws something...

**Calculus**

Nevermind! I figured out you're supposed the plug the positive value into the derivative v'(t).

**Calculus**

Hi I have the same question. The first part is correct to find the maximum height, but while solving for the quadratic formula to find the velocity when it hits the ground, the answer is incorrect. (You would get 7.2749 and -0.27492 after solving the quadratic)

**America Literature**

Why is Whitman the father of America's poet in Emerson's point of view?

**America Literature**

Why Emerson considered man is an analogy? And What is th relationship between human, god and nature in Emerson's point of view?

**science**

How do plants vary in their efficiency at producing joules for human consumption?

**math**

Conduct an interview to find out how someone else responds to the question, “Why is a negative number times a negative number a positive number?” Write a report describing your findings.

**10th grade**

determine m given that m>0 and the points (m,3) and (1,m) lie on a line with slope m

**pHYSICS HElp**

***EXTRA CREDIT*** Figure 8-33 shows a 1.50 kg block at rest on a ramp of height h. When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 10.0 cm that has a ...

**Physics HELp**

In Figure 8-34, a 1.2 kg block is held at rest against a spring with a force constant k = 785 N/m. Initially, the spring is compressed a distance d. When the block is released, it slides across a surface that is frictionless, except for a rough patch of width 5.0 cm that has a...

**Physics**

An object moves along the x axis, subject to the potential energy shown in Figure 8-24. The object has a mass of 1.8 kg, and starts at rest at point A. (a) What is the object's speeds at point B, at point C, and at point D?

**Physics**

An object moves along the x axis, subject to the potential energy shown in Figure 8-24. The object has a mass of 1.8 kg, and starts at rest at point A. (a) What is the object's speeds at point B, at point C, and at point D?

**Physics**

A) ( 1/2 )kx^2 = ( 1/2 )mv^2 so.. k=mv^2/x^2 (make sure you convert 5.7cm to meters first.) B) ( 1/2 )kx^2=(1/2)mv^2 so... v^2=kx^2/m solve for v.

**Physics**

In Figure 8-34, a 1.2 kg block is held at rest against a spring with a force constant k = 785 N/m. Initially, the spring is compressed a distance d. When the block is released, it slides across a surface that is frictionless, except for a rough patch of width 5.0 cm that has a...

**Physics**

Figure 8-33 shows a 1.50 kg block at rest on a ramp of height h. When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 10.0 cm that has a coefficient of ...

**chemistry**

ohh there are no numbers just a chart to fill out

**chemistry**

how do you find the mass solute(g), GFM(g/mole), moles of solute, volume of solution, and molarity of solution (M), of CaSO(4)? *how would i solve this set by set? * what are the formulas?

**Physics**

Delta* wow i cannot type

**Physics**

also Deta E*

**Physics**

mgh* cos theta* sorry

**Physics**

for simplicity i am going to do this symbolically. m = .47Kg l = 1.2m g = 9.81m/s² è = 31 degrees the change in potential energy is mgÄh in this problem, Äh = l-lCos(è) = l(1-cosè) (it is 1-cosè becaus cos 90=1.. and its cos 90-cos&...

**Physics**

you do: 1/2mv(initial)^2+mgh=1/2mv(final)^2 so simplify that to : v(inital)= sqrt(v(final)^2-2gh) For b): 1/2mv(initial)^2=mgh solve for h : h=v^2/2g then add your original height to the new height for your answer

**Math**

This week, the Laketown Cruise Company took its boat on 19 cruises, carrying the boat's full capacity of 46 guests on each cruise. If each guest paid $22 admission, then how much admission was collected by the company this week? A) Estimate B) Exact calculation

**paralegal**

What are the similarities and differences of federal and state systems?

**physics**

The diffusion coefficient for calcium ions crossing a biological membrane 10nm thick is 300 micrometers squared/second and the concentration difference of calcium ions across the membrane is 400 mol/m^2 (Molar mass of calcium is 40 kg/mol) Determine the number of moles of ...

**CHEMISTRY**

Hey 1)how do you estimate the line widths (full width half maximum) of the peaks arising from: (a) The emission of a hollow cathode lamp (b) The absorption peak of caffeine in the UV –visible spectrum (c) The d-d transition observed for Ni2+ in aqueous solution 2)Comment ...

**Physics**

4.2m

**Chem**

Solid carbon dioxide (dry ice) goes from solid to gas at -78C. The molar heat of sublimation is 25.3 kj/mol. In one experiment 34.5g of dry ice are placed in an insulated isolated container with 500 g of water at 25C. What temp of the water is expected after all bubbles are ...

**Time Zones**

Check my work. Calculate the correct time in brackets: 1. 1:00am at 30W = (11:00pm) at 60W 2. 3:00pm at 15W = (1:00pm) at 45W 3. 1:00pm at 120E = (9:00am) at 60E 4. 12:00pm at 15E = (6:00pm) at 105E 5. 11:00am at 15E = (9:00am) at 15W Calculate the correct longitude in ...

**Physics**

got it v=[(2*m1)/(m1+m2)]Vo then take your answer and insert into 1/2mv^2 and divide by 1000

**Physics**

i agree with that but how would you find the kinetic energy acquired by the nail after you get these numbers?

**chemistry**

Reacting 959 mol of SiO2 with excess carbon yields 28.8 kg of SiC. What is the percentage yield? SiO2 + 3C--> SiC + 2 CO

**chemistry**

2 KClO3(s)--> 2 KCl(s) + 3 O2(g) How many milliliters of O2 will form at STP from 38.8 g KClO3?

**math**

the ratio of single screen theaters to multiple screen theaters is 1 to 15. if there are 9 single screen theaters, how many multiple screen theaters are there?

**chemistry**

10.0mL of solution containing 20.0 mL of 1.0 M NaX (unknown base) and 10.0 mL of 1.0 M HX (unknown acid) was diluted with 50.0 ml water. The pH is 4.92. What is the concentration of HX after dilution and X- after dilution? What is the equilibrium concentration of HX, X-, and ...

**chemistry**

calculate number of grams of iron in one mole of ferrous ammonium sulfate.hint how many moles are in one mole of ferrous ammonuim sulfate?

**biology honors**

Summarize Griffith's transformation experiments

**Environmental Science**

After spraying crops with ddt for several years, farmers found that population of insects pests rebounded. suggest another reason based on what you know about population food pyramid predators and competitors

**chemistry**

Write the condensed structure for Methylpropyl ether Would it be C4H11O? CH3-O-CH3CH2CH3

**Accounting**

dadfadf

**chemistry**

When 0.767 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 125C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant figures. Do not ...

**Physics**

A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are perpendicular to the book and are horizontal. The book weighs 32 N. The coefficient of static friction between his hands and the book is...

**Math**

In the following table R(t) is the quarterly revenue for an international tortilla producer t quarters after December 1999. Use the table to answer the following questions. Find R(t) where t=4. What was the revenue 2 quarters after 1999.. What does t equal when R(t) = 486. (In...

**Trig**

How do you express these problems as single trigonometric function values or as single numbers, using identities? 1. cos^2pi/8-1/2 2. tan34degrees/2(1-tan^2 34degrees) 3. 1/8sin29.5degreescos29.5degrees

**college**

In the following table R(t) is the quarterly revenue for an international tortilla producer t quarters after December 1999. Use the table to answer the following questions. Find R(t) where t=4. What was the revenue 2 quarters after 1999.. What does t equal when R(t) = 486. (In...

**English**

9) I have two hours of PE a week, but I have three hours of French a week. Instead of doing normal training, we practice golf. How many hours of French do you have a week?

**Science- Meteorology**

Most climate models show that the poles will warm faster than the tropics. What effect will this have on winter storms in the mid-latitudes?

**Math**

1+2+3+4=10 plants

**begining algebra**

side 1= 3x side 2= x side 3= x+7 3x + x + x+7 = 62 5x = 55 x=11 side 1= 3(11) = 33 side 2= (11) = 11 side 3= (11)+7 = 18

**Physics**

The punter on a football team tries to kick a football so that it stays in the air for a long "hang time." If the ball is kicked with an initial velocity of 25.0 m/s at an angle of 57.5° above the ground, what is the "hang time"?

**calculus**

An airplane is flying on a bearing of 80 degrees at 540mph. A wind is blowing with a bearing of 100 degrees at 55mph. Find the component form of the velocity of the airplane.

**Math**

The function H described by H(x)= 2.75x + 71.48 can be used to predict the height, in centimeters, of a woman whose humerus( the bone from the elbow to the shoulder) is x cm long? Predict the height of a woman whose humerus is 35 cm long. Is this correct? 2.75(35) + 71.48= 167...

**Math**

80% of what number is 20? Would this be 100?

**physics**

x=1/2(vo+v)t

**physics**

vo1=a1t1

**algebra 1**

marcy has a total of 100 dimes and quarters. if the total value of the coins is $14.05, how many quarters does she have?

**algebra 1**

marcy has a total of 100 dimes and quarters. if the total value of the coins is $14.05, how many quarters does she have?

**2nd grade**

My son is in 2nd grade and we are doing Math Rules. One rule has stumped us all. It's- 6 in 3 out 10 in 5 out 16 in 8 out

**Math**

The digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 are repeated in such a way that when the digits repeat the greatest digit is removed: what is the 1111st number in the pattern ex:...

**Math-Fractions**

that's cool. Thanks