Posts by 007

Total # Posts: 11

Language arts
3 is wrong the good answers are 1=b 2=d 3=a 4=a

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)

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

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

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.

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

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 ...

physics
008

physics
Are you sure its 42?

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

acids and alkalis
thanx you helped me