Sunday
December 4, 2016

# Posts by CR

Total # Posts: 48

Math
What is the additive inverse of f(x)=(x-2)^2?
October 18, 2016

Math
166.14
March 8, 2016

Math
i think is 72
November 17, 2015

Physic
CFL light bulbs consume less power than their incandescent counterparts while providing about the same amount of light. Suppose a CFL, while consuming only 20 Watts of power produces as much light as a 60 Watt incandescent bulb. Also, suppose a house has 8 lightbulbs which are...
February 10, 2015

math
126 (neither Bio. nor Spanish) +52 (Spanish) ___ 178 (total of students that can't be chosen) 200 (total students) -178 (total it can't be chosen) ____ 22 22/200 = 11/100 = 11% This is not the only way to solve it.
March 12, 2013

math
the pizza was cut into 10 slices two people ate 4/5 of it they did not eat the same amount how many slices might each have eaten?
February 7, 2013

science: chemistry
Use PV=nRT P is pressure in atm V is what you are looking for n is number of moles (1.5 mol) R is a constant( .08206) And T is temperature in Kelvin (22+273) PLUG AND CHUG
July 14, 2011

An object is p = 34.3 cm in front of a concave mirror. Its real image height is 6 times larger than the object height. What is the location of the image? Answer in units of cm. What is the radius of curvature of the mirror? Answer in units of cm.
April 28, 2011

The index of refraction of a transparent liquid (similar to water but with a different index of refraction) is 1.39. A flashlight held under the transparent liquid shines out of the transparent liquid in a swimming pool. This beam of light exiting the surface of the ...
April 28, 2011

Physics ~ missed this lecture pls help
An object is p = 34.3 cm in front of a concave mirror. Its real image height is 6 times larger than the object height. What is the location of the image? Answer in units of cm. What is the radius of curvature of the mirror? Answer in units of cm.
April 28, 2011

Physics ~ missed this lecture pls help!
The index of refraction of a transparent liquid (similar to water but with a different index of refraction) is 1.39. A flashlight held under the transparent liquid shines out of the transparent liquid in a swimming pool. This beam of light exiting the surface of the ...
April 28, 2011

Physics ~ missed this lecture pls help
Got it ~ thanks!
April 28, 2011

Physics ~ missed this lecture pls help
I was able to get distance but both my magnifications were incorrect. pls help
April 28, 2011

Physics ~ missed this lecture pls help
The first answer is 20.93, then when I take that and divide it by 18.5 equals 1.13 but that is incorrect. What am I doing wrong? Then using the same formula (1/9.82)- (1/4.06) comes out -6.92 which doesn't seem right either. please help.
April 28, 2011

Physics ~ missed this lecture pls help
A thin converging lens of focal length 9.82 cm forms an image of an object placed 18.5 cm from the lens. Find the image distance. Answer in units of cm. What is the magnification for an object distance of 18.5 cm? Find the location of the image for an object distance of 4.06 ...
April 28, 2011

Physics ~work shown pls help!
According to my homework this is incorrect too. What could be wrong.
April 15, 2011

Physics ~work shown pls help!
An electron is accelerated by a 6.4 kV potential difference. The charge on an electron is 1.60218 × 10^−19 C and its mass is 9.10939 × 10^−31 kg. How strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.1 cm? ...
April 15, 2011

Physics with work, pls help
A proton is moving in a circular orbit of radius 11.8 cm in a uniform magnetic field of magnitude 0.232 T directed perpendicular to the velocity of the proton. Find the orbital speed of the proton. Answer in units of m/s. I came up with .118/2.83x10^-7 and it was incorrect. (...
April 15, 2011

Physics -work shown
Thank you so much! I am struggling through this class. The professor is so intellegent that he doesn't bring it down to the basics for understanding.
April 15, 2011

Physics -work shown
A heavy conductor (mass m, length `, resistance R) is suspended by two springs each with spring constant k, and connected to a battery with electric potential V as shown in the figure. A magnetic field ~B is now imposed. The acceleration of gravity is 9.8 m/s2 . Which ...
April 15, 2011

Physic ~ pls help
I selected #1 AND IT WAS INCORRECT. I guess I just don't understand...
April 15, 2011

Physic ~ pls help
A heavy conductor (mass m, length `, resistance R) is suspended by two springs each with spring constant k, and connected to a battery with electric potential V as shown in the figure. A magnetic field ~B is now imposed. The acceleration of gravity is 9.8 m/s2 . Which ...
April 15, 2011

Physics ~ work shown, pls help!
Calculating your v gave me 2.62285030e-48 so I then divide .118/ans and get 4.4989e46 would this be right?
April 15, 2011

Physics ~ work shown, pls help!
A proton is moving in a circular orbit of radius 11.8 cm in a uniform magnetic field of magnitude 0.232 T directed perpendicular to the velocity of the proton. Find the orbital speed of the proton. Answer in units of m/s. I came up with .118/2.83x10^-7 and it was incorrect. (...
April 15, 2011

Physics *work shown ~ pls help!
What answer do you get when you calculate? Am I doing something wrong in my calculations?
April 15, 2011

Physics *work shown ~ pls help!
An electron is accelerated by a 6.4 kV potential difference. The charge on an electron is 1.60218 × 10^−19 C and its mass is 9.10939 × 10^−31 kg. How strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.1 cm? ...
April 15, 2011

Physics - pls help
---------- + - ------- | V | | | Spring K Spring K | | | | <------------l------------> Heavy Conductor R | mg Hope this helps! Please help.
April 14, 2011

Physics - pls help
A heavy conductor (mass m, length `, resistance R) is suspended by two springs each with spring constant k, and connected to a battery with electric potential V as shown in the figure. A magnetic field ~B is now imposed. The acceleration of gravity is 9.8 m/s2 . Which ...
April 14, 2011

Physics pls help
April 14, 2011

Physics pls help
A proton is moving in a circular orbit of radius 11.8 cm in a uniform magnetic field of magnitude 0.232 T directed perpendicular to the velocity of the proton. Find the orbital speed of the proton. Answer in units of m/s. I came up with .118/2.83x10^-7 and it was incorrect.
April 14, 2011

Physics pls help
What am I doing wrong? Sqrt (9.10939x10^-31)x(2)x(6400)/(1.60218x10^-19)sqrd =673966.5256 ans * (1/.051) = 13215029.91 Wrong answer. I have entered four wrong answers. I can not enter another wrong answer and pass this homework. pls help!
April 14, 2011

Physics pls help
An electron is accelerated by a 6.4 kV potential difference. The charge on an electron is 1.60218 × 10^−19 C and its mass is 9.10939 × 10^−31 kg. How strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.1 cm? ...
April 14, 2011

Physics- Pls help~review for test!
A 10.0 kg box is pulled along a horizontal surface by a 40N force which is applied at a 30.0 degree angle. If uk = 0.3, calculate the acceleration of the box.
March 17, 2011

Physics * (Wht am I doing wrng? answ provided)
A 6 kg block slides on a horizontal frictionless surface with a speed of 1.5 m/s . It is brought momentarily to rest when it hits a bumper that compresses a spring. The acceleration of gravity is 9.8 m/s2 .How much is the spring compressed if its force constant is 7 kN/m? ...
March 11, 2011

Physics
Please help ~ Two blocks are arranged at the ends of a massless string as 3.21 kg (box hanging from table) 4.96 kg (box on table). The system starts from rest. When the 3.21 kg mass has fallen through 0.4 m, its downward speed is 1.27 m/s. The acceleration of gravity is 9.8 m/...
February 21, 2011

Physics
60 M/H = 26.82 m/s. t=v/a=_____
February 20, 2011

Physics
a VW beetle goes from 0-60miles/hour with an acceleration of 2.35m/s(squared). How much time does it take for the Beetle to reach this speed. Here's what I have 60 miles = 96560.64m.
February 20, 2011

Physics
A Boeing 747 "Jumbo Jet" has a length of 59.7m. The runway on which the plane lands intersects another runway. The width of the intersection is 25.0m. The plane decelerates through the intersection at a rate of 5.7 m/s(squared) and clears it with a final speed of 45....
February 20, 2011

Physics
In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.31 × 106 m/s.Find the central force acting on the electron as it revolves in a circular orbit of radius 4.95 × 10−11 m. Answer in units of N. Find the centripetal ...
February 20, 2011

Physics
Two blocks are arranged at the ends of a massless string as shown in the figure. The system starts from rest. When the 3.21 kg mass has fallen through 0.4 m, its downward speed is 1.27 m/s. The acceleration of gravity is 9.8 m/s2 . 3.21 kg (box hanging from table) 4.96 kg (box...
February 20, 2011

Physics
A string under a tension of 48 N is used to whirl a rock in a horizontal circle of radius 2.4 m at a speed of 18.48 m/s. The string is pulled in, and the speed of the rock increases. When the string is 1.076 m long and the speed of the rock is 49.4 m/s, the string breaks. What...
February 20, 2011

Physics
2.31 × 10>6 m/s (should be 10 to the 6 power) and 4.95 × 10>−11 m (should be 10 to the -11 power) answer 1.0780e23 was incorrect. Need in N.
February 20, 2011

Physics
In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.31 × 106 m/s.Find the central force acting on the electron as it revolves in a circular orbit of radius 4.95 × 10−11 m. Answer in units of N. Find the centripetal ...
February 20, 2011

chemistry
For the reaction 2Na(s) + Cl(g) ¨2NaCl(s), how many grams of NaCl could be produced from 103.0 g of Na and 13.0 L of Cl (at STP)?
December 1, 2009

Child care
i would think its all
November 18, 2009

help