# Posts by tina

Total # Posts: 1,241

**Physics**

You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. You shoot the gun straight up, and it takes 3.8 s for the dart to land back at the barrel. What is the maximum horizontal range of your gun?

**Physics**

An Olympic long jumper is capable of jumping 8.3 m. Assume that his horizontal speed is 9.5 m/s as he leaves the ground. He was in the air for .87 seconds. How high does he go assuming that he lands upright, the same way he was when he left the ground?

**Physics**

At what projection angle will the range of a projectile equal to 5 times its maximum height?

**MBA Practice problems**

you are presently involved with a project to establish the cost of the gold presently used in the production of 1000 computer chips per month. each chip uses two grams of 20 ct gold with the remaining portion of a metal whose cost is insignificant. what is the monthly cost of ...

**physics**

A ball thrown horizontally at 22.3 m/s from the roof of a building lands 31.0 m from the base of the building. How high is the building?

**physics**

Two boxes of masses 21.6 kg and 28.2 kg sit on a smooth, frictionless surface. The boxes are in contact, and a horizontal force of 68.2 pushes horizontally against the smaller box. What is the acceleration of the two boxes?

**Physics**

A tether ball of mass 0.25 kg is attached to a vertical pole by a cord 1.4 m long. Assume the cord attaches to the center of the ball. The cord makes an angle of 20° with the vertical. (a) What is the tension in the cord? (b) What is the speed of the ball?

**Astronomy/Physics**

I cannot calculate the gravitational force between these two objects. I am confused. Jupiter (R=800 million km, M = 2 x 10 to the 27th power kg and a 100 kg person on earth. Please help!

**physics**

calculate horizontal force that must be applied to 1kg to make 6ounce to make it accelerat on horizontal friction three hour table dropped with same acceleration it would have if it and feel freely

**Statisics**

35%of adult Americans are regular voters. A random sample of 250 adults in a medium-size college town were surveyed, and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence and comment on your results... Can you show ...

**Physics**

is force and normal force the same thing? if not what is the difference. for instancee if a problem said given a force of 20 newtons. would normal force be 20 newtons? please answer !!!!!!!!!

**statistics**

A random sample of state gasoline taxes in cents is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does you interval contain the national average of 44.7 cents? 38.4 40.9 67 32.5 51.5 43.4 38 43.4 50.7 35.4 39.3 41.4

**English (Urgent)**

I think it sounds great...:))) Keep up the good work!!

**Physics**

what equation would I use to find the magnitude of the mass's velocity?

**Physics**

how do you find the magnitude of the mass's velocity?

**Physics**

A mass of 18 kg is being pushed up a frictionless incline with a constant force of 20 Newtons directed parallel to the incline, up the incline. At the top of the incline the mass is moving at 23 m/s up the incline. If the angle of inclination is 58 degrees and the height (not ...

**calculus**

Find constants a and b in the function f(x)=ax^b/(ln(x)) such that f(19)=1 and the function has a local minimum at x=19. What is a and b?

**Physics**

A mass of 11 kg is placed on a frictionless incline which is inclined at an angle of 69 degrees above the horizontal. It is held in place by a rope which is attached to a wall at the top of the incline. The rope is angled 13 degrees above the direction parallel to the incline...

**Physics**

A mass of 8 kg lies on a horizontal, frictionless floor. A force of 72 Newtons pushes to the left (negative x direction) with a force of 72 Newtons. Another force of unknown magnitude pushes the mass in a direction of 21.4 degrees above the positive x axis. The mass is ...

**Physics**

A mass of 5.6 kg lies at the top of a frictionless incline. It is inclined at an angle such that the normal force on the mass is 30 Newtons. If the length of the incline is 58 meters and the mass is originally at rest at the top of the incline and then released, how long does ...

**Physics**

A mass of 5.6 kg lies at the top of a frictionless incline. It is inclined at an angle such that the normal force on the mass is 30 Newtons. If the length of the incline is 58 meters and the mass is originally at rest at the top of the incline and then released, how long does ...

**Physics**

A mass of 18 kg is being pushed up a frictionless incline with a constant force of 20 Newtons directed parallel to the incline, up the incline. At the top of the incline the mass is moving at 23 m/s up the incline. If the angle of inclination is 58 degrees and the height (not ...

**Physics**

A mass of 5.6 kg lies at the top of a frictionless incline. It is inclined at an angle such that the normal force on the mass is 30 Newtons. If the length of the incline is 58 meters and the mass is originally at rest at the top of the incline and then released, how long does ...

**Physics**

A mass of 18 kg is being pushed up a frictionless incline with a constant force of 20 Newtons directed parallel to the incline, up the incline. At the top of the incline the mass is moving at 23 m/s up the incline. If the angle of inclination is 58 degrees and the height (not ...

**physics**

3.5

**algebra**

The length of a rectangle is 3x + 4/4x^2-4 and and the width is8x − 8/6 the area of the rectangle is a)1 b)2 c)x+1/x-1 d)4 please help!

**Physics 1**

A mass of 18 kg is being pushed up a frictionless incline with a constant force of 20 Newtons directed parallel to the incline, up the incline. At the top of the incline the mass is moving at 23 m/s up the incline. If the angle of inclination is 58 degrees and the height (not ...

**us history**

why don't more textbooks have readings on blacks resisting slavery?

**science**

A race car travels northward on a straight, level track at a constant speed travels 0.756 km in 18.0 s. The return trip over the same track is made in 23.0 s

**history**

why did the europeans say the indians were uncivilized ?

**chemistry**

A doctor has ordered that a patient be given 11 of glucose, which is available in a concentration of 60.00 glucose/1000.0 of solution. What volume of solution should be given to the patient?

**math**

use the digits 0,2,4,6,8 exactly once to form a 3-digit and 2-digit NEGATIVE intfer that will give you the LEAST possible sum when the two intergers are added together.

**geometry**

Point M is the midpoint of line JK. If JM is 6x-7 and MK is 2x+3 what is JK?

**AP Chemistry**

A 21.0054 g sample of impure magnesium carbonate was heated to complete decomposition according to the equation MgCO3(s) → MgO(s) + CO2(g) . After the reaction was complete, the solid residue (consisting of MgO and the original impurities) had a mass of 19.0732 g. ...

**AP Chemistry**

In the reaction below, 23 g of H2S with excess O2 produced 9 g of sulfur. ? H2S + ? O2 → ? S + ? H2O . What is the percent yield of sulfur? Answer in units of %

**AP Chemistry**

For the reaction ? Al + ? CuSO4 ↽⇀? Al2(SO4)3+? Cu a maximum of how many moles of Al2(SO4)3 could be formed from 5.49 mol of Al and 4.09 mol of CuSO4? Answer in units of mol

**Chemistry**

Not sure of my answers, pls help me out. I have to indicate the kinds of intermolecular forces that occur between the solute and the solvent in which the molecule is most soluble. a) glucose b) naphthalene c) dimethyl ether d) alanine (an amino acid)

**math**

tom sells 15% of 180 acres to dan for 1,100 an acre .the motrgage finace fees dan must pay are 3% of the total price.how much are the fees

**Writing**

can someone look at my previous post?

**Writing**

Ms. Sue im start all over but I don't know how to start my body similaritie paragraph off.

**Writing**

can someone proofread my writing? Ms.Sue preferably?

**Writing**

Conflict? That’s the word defines me. Why? I’m always having and issue with someone and it leads to fussing back and forth at each other. In the story, “Interlopers” by Saki and in a conflict I had with my sister we had a lot of similarities and differences...

**Phi103**

Answers to phi 103 week 5 test

**Algebra**

solev the compound inequality 2x-9/8<-7 or 2x-9/8>6

**Science**

According to Peter Saundry there is no true universal code of ethics because standards of conduct vary from place-to-place and time to time. True or false

**history**

can you please help me writing as i have ready this but not able to make out the specific reasons which lead to shaping Europe

**history**

how did the Iberian Reconquista figure in shaping modern Europe [Europe after 1500]?

**Real Estate Law**

For the most part, mortgage loans are made by __________ institutions. (Points: 5) a. lending b. personal c. private 4. government I think its A

**history**

what factors enabled the Europeans to quickly assert their hegemony over indigenous peoples in the Americas and to compel Eastern potentates to yield to European commercial demands or to accept Western political control?

**history**

What factors led Atlantic community states to seek ways to access Asian markets by avoiding the Mediterranean late in the 15th and early in the 16th-centuries?

**Chemistry**

A gas at a temperature of 95 degrees C occupies a volume of 159 mL. Assuming constant pressure, determine the volume at 15 degrees C.

**phi 103**

a weak inductive argument

**statistics**

Suppose the following summary statistics are obtained from a large group of individuals:X =52.0, Sx= 8.7, Y =147.3, Sy = 16.9. Dorothy receives an Xscore of 52. What is her predicted Y score if r = o?

**English**

Are the answers above correct? Please help.

**English**

2.run-on sentence correction: That brand of car goes very fast; which is why many people want them. 3.verb tense Grammar quizzes can be tough. There is a lot to learn, and remember. I find that it gets easier with practice. 4.subject verb agreement Can I call you back? I am ...

**English**

Each of the follwing sentences need to be re-written so they are grammatically correct, also they each have one grammaitical error such as subject-verb agrrement, run on sentence, verb form and tense or sentence fragment. please help 1. The bank robber escaped from the bank. ...

**English**

Can you tell me the grammatical error on the following sentences eg:subject-verb agrrement, run on sentence, verb form and tense, or sentence fragment. Also These sentences need to be re-written. 1. They is both happy. 2. at 3PM I will be feeding the ducks. At the park.. 3. ...

**MATH, PLEASE HELP!**

Suppose you invest your money into an account that pays 4.0% per year compounded quarterly. How long (in years) will it take for your money to triple? Round your answer to one decimal place. I know I use this... A=P(1+r/n)^nt But to go from there and get an answer, so confused...

**Math**

Suppose you invest your money into an account that pays 4.0% per year compounded quarterly. How long (in years) will it take for your money to triple? Round your answer to one decimal place. I know I use this... A=P(1+r/n)^nt But to go from there and get an answer, so confused...

**Physics**

Why is there a centripetal acceleration if the velocity does not increase? a. Velocity changes direction as you move around the circle, causing a Δv b. Velocity in a circle is always constant c. Because gravity will hold any object in a circular motion I am almost sure ...

**physics**

What are some examples of real resistors used in circuits?

**mechanics**

what is the kinetic energy of an object that has a mass of 20nkilograms and a speed of 2.8 m/s

**Physics**

Question: When a balloon is rubbed with fur, it becomes negatively charged. Explain why?

**Math**

A person standing near the edge of a cliff 120 feet above a lake throws a rock upward with an initial speed of 40 feet per second. The height of the rock above the lake at the bottom of the cliff is a function of time and is described by the function H(t) = –16t2 + 40t + ...

**chemistry**

How could I determine if one rock is denser than another rock?

**physics**

A ray of light enters the top of a glass of water at an angle of 36 degrees with the vertical. What is the angle between the refracted ray and vertical? The answer is 26 degrees but I keep getting 22 degrees. I used snell's law: n1sinθ1=n2sinθ2 for n1 I thought ...

**Physics**

A string with a linear density of 0.035 kg/m and a mass of 0.014 kg is clamped at both ends. Under what tension in the string will it have a fundamental frequency of 100 Hz? The correct answer is 270N but I don't know how to get there. Here are some of the equations we can...

**CHEMISTRY**

Analyze the properties of a sodium atom and a sodium ion. What are the differences in mass, stability, and reactivity that are caused due to the differences between the sodium atom and sodium ion?

**Med terms**

Andrea is not 100% right. left lower lobe = lower left lobe (LLL)

**Physics**

Question: Two strings at different lengths and linear densities are joined together. They are stretched so that the tension in each string is 190.0 N. The free ends are fixed in place. Find the lowest frequency that permits standing waves in both strings with a node at the ...

**Physics**

1. A person driving to the right and honks their horn. An observer standing behind the car, opposite its direction of motion would hear...(choose one) a. Higher Pitch b. Lower Pitch c. Same pitch as the driver please explain how you got to the answer

**economics**

At an initial point on the aggregate demand curve, the price level is 100, and real to GDP is $15trillion. After the price level rises to 110, however, there is an upward movement along the aggregate demand curve, and real GDP declines to $14 trillion. If total autonomous ...

**economics**

Suppose that Congress enacts a lump-sum tax cut of $750 billion. The marginal propensity to consume is equal to .075. Assuming that Ricardian equivalence holds true, what is the effect on equilibrium real GDP? On saving?

**math**

How did you get that answer? I can't come up with the equations, I got them but I didn't get that answer

**math**

A manufacturer makes two products A and B, each of which is processed in two departments, production and finishing. Each A takes 3 hours to produce and six hours to finish, whereas each B takes 5 hours to produce and 2 hours to finish. How many units of A and B can be produced...

**Micoreconomics**

In recent years, the Internet auction firm eBay has sougth to make its auction technology the favorite of software programmers, and it has begun licensing its technology to other Web sites. The company's managers have pulicly stated that their goal is for eBay's ...

**Physics**

I need a complete list all the doppler effect equations for a beginner physics class. Here is a sample questions so you know the level Question: Two trains on separate tracks move toward one another. Train #1 has a speed of 130 km/hr and train #2 a speed of 90km/hr. Train 2 ...

**MATH**

10(10)+ 5(10)

**Algebra**

Can you help me solve this please? 31%=1-600/Q Answer: 869.6 But in don't know how to get to the answer

**Physics**

1. Water with a mass of 2kg is held at constant volume in a pressure cooker. 10,000 J of energy is added from the heater inside the pressure cooker. The container is not terribly well insulated, so the container leaks 2000 J of energy to the surrounding air. What is the total ...

**algebra**

Determine whether 14 is a solution of the equation 6(x - 2)= 70

**Physics**

1. How much energy is required to be removed to lower the temperature of a bottle of drinking water (280mL) from 22°C to 4°C? The density of water is 1.0g/mL here are the equations we can use: (-m1)(C1)(ΔT1)=(m2)(C2)(ΔT2) Q=mcΔT Q=mL There might be ...

**chemistry**

A traveling wave is produced on a rope. The wave travels until it hits a wall and it is reflected. If the speed of the wave is 1.8 m/s and it takes 3.3 s to get back to the starting point, how long (m) is the rope.

**Education**

Can you explain why teachers who wish to promote a developmentally appropriate science education program must be knowledgeable about children's level of development.

**Education**

Why is science an integral part of the play-centered curriculum?

**Education**

What is the goal of early childhood science education?

**Education**

What is an example of play that relates to a curriculum standard in mathematics?

**physics**

The momentum before and after the explosion is the same. Since there are no external forces acting on the satellite, the law of conservation of momentum states that momentum will not change. Basically the total momentum of the satellite before the explosion is equal to the ...

**physics**

The momentum of a car traveling east is different from the momentum of an identical car traveling west at the same speed. Momentum is a measure that includes both the mass and the velocity of an object. The two cars have identical mass (I am assuming they have identical mass ...

**Physics Equation**

What is the equation for total energy (TE)?

**Physics**

Did you get 22/2 because it said halfway?

**Physics**

1. if a 0.05kg coin is hanging from 22m above the ground: a. If you drop it, how fast will the coin be moving halfway to the ground? b. How fast will it be moving just before it hits the ground? If you could point me the right direction with equations that would be great. I ...

**Physics**

What makes you think I just want answers. I am here to learn and simply showing me how to set up the problem is enough. Your answer was helpful but you don't have to be mean.

**Physics**

A 30kg block sits on a ramp, with Θ=47. The ramp is 13m off the ground at the tallest point. If the block slides in the presence of friction, with μ=0.1, how fast is the block moving when it hits the bottom of the ramp? Please indicate which equation you use, what ...

**Physics**

If you could just post the equations that would be helpful in this problem that would be great. I am sure I can figure it out form there. Also does TE stand for total energy?

**Physics**

A winch with a power rating of 400 W lifts a 200kg object off the ground at a constant velocity for 17 seconds. How high was the object lifted? What is the object total energy? Please indicate which equation you use, what variable corresponds to each number, and how you got ...

**Physics**

Question: A car is on a ramp 100m from the bottom of the ramp (angle of incline=30 degrees): a. If the potential energy of the car is 80902 J, how much does the car weigh? b. What is the KE half way down the ramp? c. What speed is the car moving at the bottom of the ramp? ...

**Physics**

Question: A 0.200kg ball moves with a velocity of 0.3m/s. It collides with a second ball that is at rest and has a mass of 0.1kg. After the collision, the velocity of 0.1kg ball is 0.26m/s. What is the new velocity of the first ball. Please indicate which equation you use, ...

**Physics**

1. A 0.75kg ball traveling horizontally to the right at 20m/s. A player strikes the ball and causes it to move in the opposite direction with a velocity of 24m/s. a. What impulse was delivered by the player to the ball? b. If this took 0.3 seconds to occur, What force must be ...

**Physics**

A cart of apples is rolling toward you in the street. It’s velocity is 2m/s. Its total mass is 50kg. You are running toward the cart of apples (hint your velocity is opposite direction of the carts velocity). You have a mass of 45kg. What velocity must you be running at ...