Saturday

January 31, 2015

January 31, 2015

Total # Posts: 76,951

**physics**

A projectile is fired into the air from the top of a cliff of height h = 186 m above a valley. Its initial velocity is v0 = 64.8 m/s at an angle θ = 59° above the horizontal. Where does the projectile land? (Ignore any effects due to air resistance.)
*December 4, 2014*

**college algebra**

Find a12 when a1 = 5 and r = – 2.
*December 4, 2014*

**math**

f(x)=x^6-2x^4-81x^2+162;-3
*December 4, 2014*

**please check my english**

c d c b are the correct answers
*December 4, 2014*

**Physics**

Question: A force of 25N pushes a curling rock from rest 1.0 m across a frictionless surface. Find the FINAL kinetic energy. attempts: Well i guess it would be changeinEk so i tried Wnet=changeinEk fnet x changeinD = 1/2mvf^2-1/2mvi^2 to fnet x changeinD +1/2mvi^2=1/2mvf^2 ...
*December 4, 2014*

**Math**

A container holds 5 quarts when filled now it contains 3 3/4 quarts of water. How much more water must be added to fill the container
*December 4, 2014*

**Physics**

Question: A force of 25N pushes a curling rock from rest 1.0 m across a frictionless surface. Find the FINAL kinetic energy. attempts: Well i guess it would be changeinEk so i tried Wnet=changeinEk fnet x changeinD = 1/2mvf^2-1/2mvi^2 to fnet x changeinD +1/2mvi^2=1/2mvf^2 ...
*December 4, 2014*

**Biology**

How is ATP released as heat? Where does the heat go?
*December 4, 2014*

**Math**

A savings account with a current balance of $5,000 earns 2.75% annual interest, compounded continuously. To the nearest dollar, what will be the account balance in 10 years?
*December 4, 2014*

**Pre-Calc/Trig...**

I have one way, but cant think of another? Show two ways of finding y if y = log4 64. Explain your thinking. 4^x=64 x=3
*December 4, 2014*

**Pre-Calc/Trig...**

Alright, thanks. (:
*December 4, 2014*

**Pre-Calc/Trig...**

Write the equation y = log x in exponential form.
*December 4, 2014*

**Math**

Nevermind, I worked the answer out
*December 4, 2014*

**Math**

A golf ball is hit off the top of a cliff that is 75 feet tall at an angle of 45° to the horizontal with an initial velocity of 80 feet per second. The quadratic equation shown below models the height, h(x), of the ball when it is x feet from the cliff’s edge. How far...
*December 4, 2014*

**Coll Algebra**

A grain barge travels on a river from point a to point b unloading and loading again. The barge travels 5mph relative to water. the river flows downstream at a rate of 1mph. if the trip upstream takes 2hrs longer than the trip downstream how far is it from point a to point b
*December 4, 2014*

**5th grade math**

How do you multiply words
*December 4, 2014*

**physics**

A projectile is fired into the air from the top of a cliff of height h = 186 m above a valley. Its initial velocity is v0 = 64.8 m/s at an angle θ = 59° above the horizontal. Where does the projectile land? (Ignore any effects due to air resistance.)
*December 4, 2014*

**physics**

A stone thrown horizontally from the top of a 18-m tower hits the ground at a point 18 m from the base of the tower. (Ignore any effects due to air resistance.) (a) Find the speed at which the stone was thrown. m/s (b) Find the speed of the stone just before it hits the ground...
*December 4, 2014*

**Science**

In order for a child to inherit a recessive genetic disease, like sickle cell anemia, healthy must both have
*December 4, 2014*

**Science**

In order for a child to inherit a recessive genetic disease, like sickle cell anemia, healthy parents must both
*December 4, 2014*

**math **

Describe a situation in which it is better to round a mixed number up to the next whole number even if the fraction in the mixed number is closer to 1/2 than 1?
*December 4, 2014*

**child dev**

The early childhood educator who designed many teaching aids to promote printing in preschoolers through the child’s sense of touch was
*December 3, 2014*

**child dev.**

Rosa is a newborn. As she grows, which will she learn to control last?
*December 3, 2014*

**Math**

Expand and simplify (p+3)(p-7)
*December 3, 2014*

**Math**

why is 19 days , can you explain to me plz ...
*December 3, 2014*

**Math**

Whats 9 + 10
*December 3, 2014*

**Pre-Calc/Trig...**

okay thanks! :)
*December 3, 2014*

**Pre-Calc/Trig...**

If An is defined as a geometric sequence, is the sequence 1/an also a geometric sequence? Explain your reasoning
*December 3, 2014*

**physics**

An object of mass 2.0 kg starts from rest at the top of a frictionless curved ramp. At the bottom, it collides with and sticks to another 2.0-kg mass object. Together the objects then cross a small rough section where there is friction before leaving the edge of the table ...
*December 3, 2014*

**Symmetry**

⬇️➡️➡️➡️⬆️➡️⬆️⬅️⬆️⬆️ The end
*December 3, 2014*

**science**

A jellyfish can propel itself with jets of water pushed out of its bell, a flexible structure on top of its body. The elastic bell and the water it contains function as a mass-spring system, greatly increasing efficiency. Normally, the jellyfish emits one jet right after the ...
*December 3, 2014*

**Pre-Calc/Trig...**

Okay, thank you :)
*December 3, 2014*

**Pre-Calc/Trig...**

is this the correct formula for me to solve this? A bacteria culture has 2,000 bacteria. The number of bacteria increases by 5% each hour. How many bacteria are there after 12 hours? 2,000*0.05^(12-1)
*December 3, 2014*

**chemistry**

A sample of steam with a mass of 0.524g and at a temperature of 100 ∘C condenses into an insulated container holding 4.20g of water at 6.0∘C.( ΔH∘vap=40.7 kJ/mol, Cwater=4.18 J/g⋅∘C) Assuming that no heat is lost to the surroundings, what is ...
*December 3, 2014*

**Pre-Calc/Trig...**

Find S5 for a geometric series for which a1 = 81 and r = 1/9.
*December 3, 2014*

**Statistics**

a study states that for a particular area, the average income per family is $35,569 and the standard deviation is $8256. what percentage of families in that area earn below $ 25,000
*December 3, 2014*

**chemistry**

How much ice (in grams) would have to melt to lower the temperature of 355mL of water from 26∘C to 6∘C? (Assume the density of water is 1.0 g/mL.)
*December 3, 2014*

**chemistry**

Calculate the amount of heat required to completely sublime 71.0g of solid dry ice (CO2) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 kJ/mol.
*December 3, 2014*

**Pre-Calc/Trig...**

Given a geometric sequence with a1 = 6 and r = 2/3, write an explicit formula for An, the nth term of the sequence.
*December 3, 2014*

**English**

1- What was Macbeth's reaction towards Lady Macbeth' death and why did Shakespeare choose to bring Lady Macbeth to an end? 2- How does Juliets death compare to the death of Lady Macbeth and why does Shakespeare bring Juliet to an end?
*December 3, 2014*

**physics**

A 2.9-kg cart starts up an incline with a speed of 2.7 m/s and comes to rest 3.0 m up the incline. The total work done (the work of the net force) on the cart is:
*December 3, 2014*

**Physics**

I don't understand the angle part. But thank you so much for the rest of it!
*December 3, 2014*

**Physics**

A projectile, fired with unknown initial velocity, lands 18.4 s later on the side of a hill, 2740 m away horizontally and 469 m vertically above its starting point. (Ignore any effects due to air resistance.) (a) What is the vertical component of its initial velocity? m/s (b) ...
*December 3, 2014*

**Pre-Calc/Trig...**

okay, thank you
*December 3, 2014*

**Pre-Calc/Trig...**

The nth term of a geometric sequence is given by an = 1/4(4)^n-1. Write the first five terms of this sequence.
*December 3, 2014*

**Pre-Calc/Trig...**

oh okay thanks
*December 3, 2014*

**Pre-Calc/Trig...**

Write the equation y = bx in logarithmic form.
*December 3, 2014*

**Physics**

A plastic bag is filled with nitrogen at atmospheric pressure and 22.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet. How large a ...
*December 3, 2014*

**Physics**

A projectile, fired with unknown initial velocity, lands 18.4 s later on the side of a hill, 2740 m away horizontally and 469 m vertically above its starting point. (Ignore any effects due to air resistance.) (a) What is the vertical component of its initial velocity? m/s (b) ...
*December 3, 2014*

**Physics**

You are trying out for the position of place-kicker on a professional football team. With the ball teed 50.0 m from the goalposts with a crossbar 3.05 m off the ground, you kick the ball at 28 m/s and 31° above the horizontal. (a) Is the field goal attempt good? no yes (b...
*December 3, 2014*

**Physics**

The range of a cannonball fired horizontally from a cliff is equal to the height of the cliff. What is the direction of the velocity vector of the projectile as it strikes the ground? (Ignore any effects due to air resistance.) ° (below the horizontal)
*December 3, 2014*

**Physics**

Nevermind, I got it. Thank you!
*December 3, 2014*

**Physics**

How would you find t? I can't get it.
*December 3, 2014*

**Physics**

A projectile is fired into the air from the top of a cliff of height h = 186 m above a valley. Its initial velocity is v0 = 64.8 m/s at an angle θ = 59° above the horizontal. Where does the projectile land? (Ignore any effects due to air resistance.)
*December 3, 2014*

**Physics**

A stone thrown horizontally from the top of a 18-m tower hits the ground at a point 18 m from the base of the tower. (Ignore any effects due to air resistance.) (a) Find the speed at which the stone was thrown. m/s (b) Find the speed of the stone just before it hits the ground...
*December 3, 2014*

**physics**

A small crack occurs at the base of a 15.0 m high dam. The effective crack area through which water leaves is 1.30 *10-3 m2 a) Ignoring viscous losses, what is the speed of water flowingthrough the crack? b) How many cubic meters of water per second leave thedam?
*December 3, 2014*

**physics**

A small crack occurs at the base of a 15.0 m high dam. The effective crack area through which water leaves is 1.30 *10-3 m2
*December 3, 2014*

**physics**

A cannon barrel is elevated at an angle of 45°. It fires a ball with a speed of 250 m/s. (For the following questions, ignore air resistance.) (a) What height does the ball reach? m (b) How long is the ball in the air? s (c) What is the horizontal range of the cannon? km
*December 3, 2014*

**physics**

A fire helicopter carries a 565 kg bucket at the end of a 16.7 m long cable. When the helicopter is returning from a fire at a constant speed of 22.5 m/s, the cable makes an angle of 20.5 ◦ with respect to the vertical. Find the horizontal force exerted by air resistance...
*December 3, 2014*

**English**

What is the simple predicate of the following sentence? The Saturn rocket made travel to the moon possible. A. Made B. Moon C. Possible {D. Travel}
*December 3, 2014*

**chemistry**

chem 1070?
*December 3, 2014*

**math**

2 h
*December 2, 2014*

**Helathcare Marketing**

2. Explain the vertical integration options and directions for the following providers:
*December 2, 2014*

**world history**

I really don't get this question ''without the english Civil war, democracy would never have developed.''make a case for or against this statement. give evidence to support your case. I really don't know how to do this
*December 2, 2014*

**math**

marty ate 4/6 of his pizza and luis ate 5/6 of his pizza..marty ate more pizza than luis how is that possible
*December 2, 2014*

**Chemistry**

Thank you this helped clearify things
*December 2, 2014*

**Chemistry **

What volume of oxygen gas at 20.9 c and 750 torr is needed to burn 3.00 liters of propane, C3H8 at the same temprrature and pressure? I know i use V1/n1=V2/n2, but how do i get n?
*December 2, 2014*

**Algebra**

The fuel efficiency for a certain midsize car is given by E(v) = −0.017v^ + 1.462v + 3.5 where E(v)is the fuel efficiency in miles per gallon for a car traveling v miles per hour. (a) What speed will yield the maximum fuel efficiency? Round to the nearest mile per hour. ...
*December 2, 2014*

**Math**

Find the possible values of b,h and l for a triangular prism with volume 21 cubic meters. How many ways can you do this? Sketch a diagram of one possible prism.
*December 2, 2014*

**Physics**

A plastic bag is filled with nitrogen at atmospheric pressure and 22.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet. How large a ...
*December 2, 2014*

**physics**

Two blocks with masses m1 = 1.20 kg and m2 = 2.90 kg are connected by a massless string, as shown in the Figure. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.300. Assume that the pulley has a negligible mass and ...
*December 2, 2014*

**ap calc**

The U.S. post office has a limit on the size of packages it will accept for mailing. the length plus the girth (distance around the middle) must be 84 inches or less. find the dimensions of the rectangular package with a square end, which will maximize the volume of the ...
*December 2, 2014*

**English**

who's more powerful- Juliet Capulet or Lady Macbeth I need some quotes too
*December 2, 2014*

**Math**

Can (6x - 1)/3 be simplified as 2x - 1/3?
*December 2, 2014*

**Math**

Chef has 25 pounds of strip loin. Trim loss on strip loin is 35% and the cooking loss is 80% of the trimmed weight. How many pounds of trimmed, cooked strip loin will the chef have left to serve to his customers?
*December 2, 2014*

**physics**

A plastic bag is filled with nitrogen at atmospheric pressure and 22.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet. How large a ...
*December 2, 2014*

**Physics**

A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 32.0 m above sea level, directed at an angle θ above the horizontal with an unknown speed v0. The projectile remains in flight for 6.00 ...
*December 2, 2014*

**science**

300,000 m away
*December 2, 2014*

**science**

after a rock layer is eroded, whick additional event must occur to create and unconformity, or a gap , in the geologic record
*December 2, 2014*

**Physics**

A proposed space station includes living quarters in a circular ring 50.5 m in diameter. At what angular speed should the ring rotate so the occupants feel that they have the same weight as they do on Earth?
*December 2, 2014*

**Physics**

Two blocks with masses m1 = 1.20 kg and m2 = 2.90 kg are connected by a massless string, as shown in the Figure. They are released from rest. The coefficent of kinetic friction between the upper block and the surface is 0.300. Assume that the pulley has a negligible mass and ...
*December 2, 2014*

**Math**

How to solve for y? x = (3y + 1)/6
*December 2, 2014*

**Physics**

A plastic bag is filled with nitrogen at atmospheric pressure and 22.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet. How large a ...
*December 2, 2014*

**Physics**

A cannon barrel is elevated at an angle of 45°. It fires a ball with a speed of 250 m/s. (For the following questions, ignore air resistance.) (a) What height does the ball reach? m (b) How long is the ball in the air? s (c) What is the horizontal range of the cannon? kmp
*December 2, 2014*

**chemistry**

does any solid pbcl2 form when 3.5mgNacl is dissolved in 0.250L of 0.12M of lead nitrate?
*December 2, 2014*

**Alg1**

I will not try to figure out where the student went wrong, but rather just do it the right way: 4√50 - 2√8 = 4(√25)(√2) - 2(√4)(√2) = 4(5)√2 - 2(2)√2 = 20√2 - 4√2 = 16√2
*December 2, 2014*

**Math**

To make an international telephone call , you need the code for the country you are calling . The codes for country A,B and C are three consecutive integers whose sum is 105. Find the code for each country .
*December 2, 2014*

**Science Please Help**

Which of the following is a testable hypothesis? A. Altered temperature may affect gas production, which measures fermentation rate. B. Does temperature affect fermentation? C. Temperature decreases will affect gas production and fermentation much of the time. D. If ...
*December 2, 2014*

**Science Please Help**

Which of the following is a testable hypothesis? A. Altered temperature may affect gas production, which measures fermentation rate. B. Does temperature affect fermentation? C. Temperature decreases will affect gas production and fermentation much of the time. D. If ...
*December 2, 2014*

**3rd grade math**

What is the next number pattern below? 16,24,32,40,48
*December 2, 2014*

**Chemistry**

It takes 476 kJ to remove 1 mole of electrons from the atoms at the surface of a solid metal. how much energy (in kJ) does it take ti remove a single electron from an atom at the surface of this solid metal?
*December 2, 2014*

**Chemistry**

A student weighs out 15g of the hydrated salt KCl (this is KCl and water) and heats it till a constant mass of 12 grams remains. What percent of the salt was water?
*December 1, 2014*

**Math Proof**

Prove f(x)=b^x is continuous on (-infinity,infinity) i.e. a exist in the reals. here assume b does not equal 1, but b>0
*December 1, 2014*

**Physics**

A plastic bag is filled with nitrogen at atmospheric pressure and 22.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 50.0 kg girl off her feet. How large a ...
*December 1, 2014*

**American History**

1. Reagan embraced the idea that through tax incentives the private sector would shift its resources from tax shelters to productive investment. This theory is referred to as A. supply-and-demand economics. B. neofederalism. C. deficit economics. D. supply-side economics. 2. ...
*December 1, 2014*

**Calculus**

Differentiate. e^cos(x^2+1) Is the answer -2xe^cos(x^2+1) sin(x^2+1)?
*December 1, 2014*

**Math**

A game is played by throwing darts at a target. A player can choose to throw two or three darts. Darcy plays two games. In Game 1, he chooses to throw two darts, and wins if he hits the target at least once. In Game 2, he chooses to throw three darts, and wins if he hits the ...
*December 1, 2014*

**Chemistry**

This helped a lot! Thank you. The following are my answers and reasons. A. False because n=3 has energy so only need to add a bit. N=1 or ground state requires more energy to ionize because it is smaller (the beginning) B. True because the electron that occupies the first she...
*December 1, 2014*

**Chemistry**

An electron is excited from the n=1 ground state to the n=3 state in a hydrogen atom. Which of the following statements are true? Correct the false statements to make them true. A. It takes more energy to ionize (completely remove) the electron from n=3 than from the ground ...
*December 1, 2014*

**Math**

A cube has a surface area of 6534 square feet. What is its volume?
*December 1, 2014*

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