Thursday
May 5, 2016

# 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 ...
June 17, 2013

physics
what is the wavelength of neutron (m=1.67x10^-27kg) travelling at 3.0x10^4 m/s?
June 16, 2013

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 ...
December 4, 2012

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°. ...
April 4, 2012

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...
April 3, 2012

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/...
April 3, 2012

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 ...
April 2, 2012

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. ...
April 2, 2012

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
April 2, 2012

biology
If an elodea leave is place in pure distilled water, what will happen? plus will this be isotonic or hypertonic or hypotonic solution.
March 15, 2011

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!
February 5, 2011

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?
January 20, 2011

Biology
Where would you find Calcium Carbonate in a Safari environment?
November 11, 2010

English
How is Scout Finch described in To Kill A Mockingbird? What does she look like and what are some personality traits she has?
November 11, 2010

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
October 8, 2010

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 ...
September 1, 2010

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.
September 1, 2010