Recent content by Intrusionv2

Nvm, got it, thanks

Homework Statement What is the mass defect of the 40Ca nucleus? Homework Equations Δm=(Zmp+(A-Z)mn)-m The Attempt at a Solution mass of 40Ca=40.078 amu mass of proton in amu is mp=1.0073 amu mass of neutron is mn=1.0087 amu atmomic number of 40Ca is Z=20 its mass number is...

Got it, thanks!

Hello, I have a question regarding enthalpy. I know that when calculating ΔS(o), you just do all of the products minus all of the reactants. However, when calculating ΔHf(o), I am confused as to what you include in the products and reactants? My book is sometimes disregarding some of the...

Homework Statement The United States generates about 5.7 x 10^16 J of electric energy a day. This energy is equivalent to work, since it can be converted into work with almost 100% efficiency by an electric motor. (a) If this energy is generated by power plants with an average efficiency of...

Makes sense, good to know!

Hey thanks for the reply, I actually got it worked out. They wanted a larger value for alpha of glass than I had. I thought that pyrex glass would be fine to use as alpha for a glass rod, guess not. They wanted 9x10^-6. But other than that my procedure is good :)

A lead rod and a common glass rod both have the same length when at 21.0° C. The lead rod is heated to 50.0° C. To what temperature must the glass rod be heated so that they are again at the same length? I did this: L = a*L0*T a (thermal expansion) of lead = (29e-6) a (thermal expansion) of...

Ahhh, I see now. Thanks! I was compensating for the vertical forces as well. For those who are reading this thread in the future, the coefficient of kinetic friction between the skier and the horizontal surface is just: -->Fk = ma -->ukN = ma -->ukg = a -->uk = a/g -->uk = -1.9768m/s2 /...

Actually, it is correct as I checked the answer. I'm guessing they just want the y-component. We haven't learned energy yet but I went ahead and looked it up and got the same answer using the potential energy to get the KE at the bottom. Only (b) is incorrect.

Homework Statement A skier with a mass of 53 kg starts from rest and skis down an icy (frictionless) slope that has a length of 59 m at an angle of 32° with respect to the horizontal. At the bottom of the slope, the path levels out and becomes horizontal, the snow becomes less icy, and the...

Nvm, I see now.

Homework Statement A car travels east at 95 km/h for 1.5 hours. It then travels 30.0° east of north at 111 km/h for 1.8 hours. What is the average velocity for the trip? (Magnitude and degrees)Homework Equations law of cosines/resultant The Attempt at a Solution I have tried doing this...

Homework Statement A car is driving down the road at 25m/s. Inside the car, the radio is blaring music at 1800Hz. How would it sound to a person standing still a) in front of the car b) behind the car?Homework Equations [fo/(vw+vo)] = [fs/(vw-vs)]The Attempt at a Solution a) [fo/(vw+vo)] =...

Homework Statement A radar beam has a wavelength of .02 m. The frequency is 17500 Hz. What would be its echo frequency if a rocket 60km away is moving at 500m/s and the radar is coming from a jet moving at 310m/s towards the rocket which is aimed at it? (b) Would the rocket appear red shifted...