# Posts by ceci

Total # Posts: 20

**physics**

orange light (lambda=630nm) hits diffraction grating which has a line spacing of (mu)m. The interference pattern is seen on a screen that is 4.0m away. what is the distance between the central bright spot and the first order bright spot on the screen. (sorry I don't have ...

**physics**

what is the wavelength of neutron (m=1.67x10^-27kg) travelling at 3.0x10^4 m/s?

**English**

For english class, I have to read a biography/autobiography of an author and then read two of the author's books that have been influenced by their real life. I chose F. Scott Fitzgerald as my author. I want to read The Great Gatsby as one of the books, but I'm not ...

**Precalc**

A restaurant uses a cable for the servers to slide orders down to the kitchen. The end where the servers place the order is 5 feet high. The end where the kitchen receives the order is 1 foot high. The angle of elevation from the kitchen to the servers stand is 25°. ...

**trigonometry ASAP!**

an airplane is seen from an observation point on the ground at an angle of elevation of 37 degrees. it is seen from a second observation point on the ground 800 yards away from the first observation point at an angle of elevation of 65 degrees. how far is the airplane from the...

**TRIGONOMETRY ASAP!**

fountains are designed so that the height and distance the water travels is dependent on θ, the angle at which the water is aimed. for any given angle θ, the ratio of maximum height H of the water to the horizontal distance D it travels is given by the formula H/D=1/...

**trigonometry ASAP!**

wendell is setting concrete on a triangular patio. one side of the patio is 12.9 feet and another side is 15.2 feet. the angle opposite the 15.2 foot side is 68 degrees. one bag of concrete covers an area of 5 square feet. how many bags of concrete will wendell need to cover ...

**trigonometry**

a restaurant uses a cable for the servers to slide orders down to the kitchen. the end where the servers place the order is 5 feet high. the end where the kitchen receives the order is 1 foot high. the angle of elevation from the kitchen to the servers stand is 25 degrees. ...

**math**

a sprinkler system on a baseball diamond rotates 120 degrees and sprays water up to 35 meters. What is the area of the diamond that can be watered with the sprinkler

**biology**

If an elodea leave is place in pure distilled water, what will happen? plus will this be isotonic or hypertonic or hypotonic solution.

**Trigonometry**

I need help with the inverse of si, cos, & tan. So far on one problem I've gotten sinX = 29/14 where do I go from here? I know you have to use cos^-1, but how? Can anyone work this one problem out for me to see how to do it? THANKS!

**chemistry**

During heating a 5 g solid gives off oxygen gas. The mass of the residue after heating is 3.5 g. What is the mass of the oxygeb ? What percent of the compoiund is oxygen?

**Biology**

Where would you find Calcium Carbonate in a Safari environment?

**English**

How is Scout Finch described in To Kill A Mockingbird? What does she look like and what are some personality traits she has?

**chemistry**

Which solutions are acidic? (Assume all solutions are at 25°C. Kw = 1.0 x 10-14 at 25°C.) A. A solution with [H+] = 9.4 x 10-6 B. A solution with [H+] = 5.5 x 10-10 C. A solution with pH = 6.1 D. A solution with [OH-] = 6.4 x 10-7 E. A solution with [OH-] = 2.0 x 10-6

**Physics**

A sled starts from rest at the top of a hill and slides down with a constant acceleration. At some later time it is 14.4 m from the top; 2.00 s after that it is 25.6 m from the top, 2.00 s later 40.0 m from the top, and 2.00 s later it is 57.6 m from the top. What is the ...

**Physics**

A subway train starts from rest at a station and accelerates at a rate of 1.60 m/s^2 for 14.0 s . It runs at constant speed for 70.0 s} and slows down at a rate of 3.50m/s^2 until it stops at the next station. Find the total distance covered.

**Science- 8th grade**

Thank you SO much! This helped a lot!! Thank you!!!

**Science- 8th grade**

What type of sand/rock is Malibu Beach made of and where did that sand originate?? I've been searching this for a while, but the only results I've gotten were for Beach Hotels.

**Science**

What kind of information has the International Space Station provided us? And what have we benefited from the information? I'm doing a project and I can't find these answeres ANYWHERE!! Any answers or websites would be GREAT!! Thank you!!!

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