Thursday

October 30, 2014

October 30, 2014

Total # Posts: 21

**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 ...
*October 27, 2014*

**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.
*October 27, 2014*

**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 ...
*October 27, 2014*

**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 ...
*October 27, 2014*

**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.)
*October 27, 2014*

**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?
*December 5, 2012*

**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?
*December 5, 2012*

**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 ...
*December 5, 2012*

**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?
*December 5, 2012*

**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?
*December 5, 2012*

**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?
*December 5, 2012*

**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?
*December 5, 2012*

**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...
*September 11, 2012*

**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?
*September 24, 2011*

**7th grade science**

HI
*January 9, 2011*

**College Algebra**

How do you simplify square roots? Like how can you get sqrt28 to be 2sqrt7?
*August 22, 2010*

**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.
*June 2, 2010*

**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
*April 11, 2010*

**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. ...
*April 11, 2010*

**Chemistry**

just do it! its rllly easy :D
*February 1, 2009*

**Science**

What will happen if you put a tea bag in cold water?
*October 8, 2008*

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