# Posts by alessandra

Total # Posts: 40

**science**

Which type of energy would the toy have if you pushed it and held the spring in the toy? F) electrical G) kinetic H) potential of I) thermal? ( there is a spring in the toy) I think it is potential energy since the spring is going down.Right?

**algebra**

wait i don't think that's right

**algebra**

can you please change these to radical form without simplifying them? 625^(3/4) 4x^(-1/2) 32y^(-2/5) x^(1/3) - y^(1/3)

**Physics. Interesting group question**

Does Newton's laws apply on earth even though we are constantly accelerating? I thought it would be true because it would apply to the uniform circular motion wouldn't it?

**Chemistry**

Elements that do not chemically react with other elements are said to be???

**Math**

how would you solve this with substitution? -3x – 2y = 16 -x + y = -8

**Genetics**

Chemical analysis of the DNA of a virus from Mars reveals that it has 48% A, 48% T, and 4% G, Suggest some possible structures for this DNA. I don't quite understand this question. All i can come to think about is that A pairs with T evenly and there will be G leaving out

**Calculus: Help Me**

The manager of a large apartment complex knows from experience that 120 units will be occupied if the rent is 294 dollars per month. A market survey suggests that, on the average, one additional unit will remain vacant for each 7 dollar increase in rent. Similarly, one ...

**Calculus**

A fence 3 feet tall runs parallel to a tall building at a distance of 7 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?

**Calculus**

oh I completely forgot that you need to plug it in. Thank you so much. i got y answer as 10614.02

**Calculus**

after that do i convert it to cubic centimeters? and if so, do i just do it to the 3rd power?

**Calculus**

Area = x^2 + 4xy = 2100 y = (2300 -x^2)/(4x) = (525/x) - (x/4) Volume = y*x^2 = 525x -(x^3/4) dV/dx = 0 = 525 - (3/4)x^2 x = sqrt 733.3 = 26.45 cm y = 13.24 cm max volume = 14,410 cm^3 unless i added wrong

**Calculus**

If 2300 square centimeters of material is available to make a box with a square base and an open top, find the largest possible volume of the box. Volume = i know it's in cubic centimeters. but i'm getting my values wrong

**Calculus**

thank you, somebody wad telling me you had to find the derivative first but i kept getting wrong answers from it

**Calculus**

A rectangle is inscribed with its base on the x-axis and its upper corners on the parabola y= 6-x^2. What are the dimensions of such a rectangle with the greatest possible area?

**Calculus**

it sid the distance formula isn't what they're looking for, they're looking for interval

**Calculus**

the distance is sqrt(x2-x1)^2+(y2 -y1)^2)? will that be a form of interval?

**Calculus**

Find the point on the line 6 x + 4 y - 1 =0 which is closest to the point ( 0, -1 ).

**Math**

How do you find decreasing intervals of 6x^3-63x^2-144x-2? I found my increasing intervals from placing the derivatives i just can't seem to solve for the decrease

**Calculus**

let y=2x^2 +5x+3 Find the differential dy when x= 5 and dx = 0.1 Find the differential dy when x= 5 and dx = 0.2

**Calculus: need clarification to where the #'s go**

A particle is moving along the curve y= 2 \sqrt{4 x + 4}. As the particle passes through the point (3, 8), its x-coordinate increases at a rate of 5 units per second. Find the rate of change of the distance from the particle to the origin at this instant. *I just need step by ...

**Math**

A particle is moving along the curve y= 2 \sqrt{4 x + 4}. As the particle passes through the point (3, 8), its x-coordinate increases at a rate of 5 units per second. Find the rate of change of the distance from the particle to the origin at this instant.

**Calculus: need clarification to where the #'s go**

Air is being pumped into a spherical balloon so that its volume increases at a rate of 80 \mbox{cm}^3\mbox{/s}. How fast is the surface area of the balloon increasing when its radius is 14 \mbox{cm}? Recall that a ball of radius r has volume \displaystyle V=\frac{4}{3}\pi r^3 ...

**Calculus: need clarification to where the #'s go**

When air expands adiabatically (without gaining or losing heat), its pressure P and volume V are related by the equation PV^{1.4}=C where C is a constant. Suppose that at a certain instant the volume is 330 cubic centimeters and the pressure is 79 kPa and is decreasing at a ...

**Calculus**

At noon, ship A is 50 nautical miles due west of ship B. Ship A is sailing west at 19 knots and ship B is sailing north at 24 knots. How fast (in knots) is the distance between the ships changing at 3 PM? (Note: 1 knot is a speed of 1 nautical mile per hour.)

**physics**

9. a fish is 5.0 ft below the surface of a still pond. At what angle to the vertical must the fish look if it is to see a fisherman sleeping on the shore of the pond?

**physics**

8. a light beam enters a piece of window glass (n=1.47) at an incidence angle of 59. Find the angle it makes to the normal as it exists from the other side of the flat window glass. What general rule can you conclude?

**physics**

7. A drop of oil is placed on a glass block. The glass has an index of refraction of 1.55. When light shines from the glass into the droplet, total internal reflection occurs at a critical angle of 59.0(degrees).find the index of refraction of oil.(this method is capable of ...

**physics**

5. A beam of light travels from benzene to water. If the angle of incidence in the benzene is 48, what will be the angle of refraction in the water?

**physics**

2. The speed of light in a certain plastic is 1.88*10^8 m/s. what is the index of refraction of plastic?

**physics**

3. a beam of light enters water from air.(a) if its angle of incidence is 70,what is the angle of refraction ?(b) at what angle must it enter the water if its angle of refraction is to be 20?

**physics**

4. A beam of light in water enters a plastic block (index of refraction=1.40(a) if the angle of incidence is 40, what is the angle of refraction in the plastic?(b) at what angle must the beam be incident on the plastic if the refraction angle is to be 30?

**Physics**

If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 2.35 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g = 9.80 m/s2? b) (b) Repeat for Mars, where the acceleration due to gravity is...

**Earth/Space Science**

What effect, if any, would you expect a massive forest fire to have on the amount of carbon dioxide in the atmosphere? Explain your answer, please?

**College Algebra**

How do you simplify square roots? Like how can you get sqrt28 to be 2sqrt7?

**Pre Calc**

magnitude : square root of ( (-2)^2 + 5^2 ) = (4 + 25) = sqrt 29 = 5.38516 angle = 180 + tan^-1(5/-2) = 179.9 = 180 degrees.

**physics**

What is the linear speed of a point: a) on the equator, b) on the Arctic Circle (latitude 66.5 degrees N), c) at a latitude of 45.0 degrees N, due to the Earth's rotation? a relevant equation is v=rw, but I'm not sure how to apply it to the equation

**history**

1950's- Fighting in Korea ends. Red scare and McCarthyism begins. Alaska and Hawaii become U.S. states. 1960's- Vietnam war. Civil rights acts. President Kennedy, and MLK are assassinated. Men land on the moon. 1970's- Nixon resigns. Iran hostage crisis. U.S. ...

**Chemistry**

just do it! its rllly easy :D

**Science**

What will happen if you put a tea bag in cold water?