Thursday
May 5, 2016

# Posts by 007

Total # Posts: 11

Chemistry
An atom emits a photon of wavelength 1.08 meters. What is the energy change occurring in the atom due to this emission? (Planck's constant is 6.626 × 10-34 joule seconds, the speed of light is 2.998 × 108 m/s)
November 5, 2015

Mechanical Behavior of Materials
3....MPa use this equation (sigma)max=(sigma)avg+R
November 8, 2014

Mechanical Behavior of Materials
Some help please. I really don't know what is my error
November 8, 2014

Mechanical Behavior of Materials
I am having problems with the first part. Because I found the deflection as: delta=((P*(l_AB)^2)*((3*(l))-l_AB))/(6*E*I) But l is not permitted, so I replaced l=0.95[m]. but I obtained a wrong answer. My deduction is correct? What is my error? Please, some help.
November 8, 2014

Mechanical Behavior of Materials
I worked with this equation: sigma=C_2*E_s*0.1^2 = 750000[Pa] Then for the energy: U=sigma*s_densification= 750000*0.8=600000[J/m^3] But the answer is incorrect. Also, I know that E=C_1*E_s*0.1^2 =15[MPa] But I don't know how can I use it. Some help please
November 8, 2014

algebra
A boy walked for 4 hours and cycled for 3 hours,covering a total distance of 74 kilometers,later he walked for 2 hours and cycled for 4 hours ,covering 82 kilometers,what were his average speed of walking and his average speed of cycling if his speed was constant in the two ...
March 13, 2013

physics
Are you sure its 42?
November 20, 2011

Economics
Haha, I'm stuck on this one too.
October 24, 2010

acids and alkalis
thanx you helped me
November 4, 2006

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