Recent content by goli12

Sweet thanks for the help Simon!

Ok i think I've got this... W/Q(hot)=1-(T(cold)/T(hot)) mgh/Q(hot)=1-(T(cold)/T(hot)) Q(hot)=mgh/(1-(T(cold)/T(hot))) Q(hot)=1.378*10^6J Is this correct Simon?

Since efficiency is 1-T(cold)/T(hot), the most efficient engine i could get in this system would be: Eff= 1-(253.25K/393.15K) = 0.3558. So only 35.58% of Q(hot) would be converted to work, while the rest goes to Q(cold)

Hi Simon I'm not sure how to calculate the required energy to warm the working fluid as neither mass or the specific heat capacity. I'm assuming that heat from the working fluid @ 120°C would be the source of energy [Q(hot)] for the engine to use as work and the rest is expelled to the cold...

Homework Statement A scientist wants to life 1000kg equipment tot the top of the hill he is working on, a rise of 50 metres. He sets up a solar energy system with parabolic mirrors that collects sunlight and warms his working fluid to 120°C (the working fluid does not freeze and does not biol...

Homework Statement A particle of mass m moves in a circle of radius R at a constant speed v, as shown below. The motion begins at point Q at time t = 0. Determine the angular momentum of the particle about the axis perpendicular to the page through point P as a function of time...

Sorry for the late reply, many thanks for your input! Ahhh yes, googled "flywheels", turned out to be some wheel under a car storing energy. Got confused with flywheels being the tyres haha :D

Homework Statement Hey guys I have two questions. The first one I'm not sure, while the second one, I have some idea but don't know how to proceed with answering the question. 1. A rapidly spinning flywheel has been suggested as an energy storage mechanism for cars. Let's consider a 300kg...

Homework Statement A fly traveling horizontally in the positive x direction lands on the side of your slice of birthday cake and gets stuck in the icing. Just before striking the cake the fly is traveling at 0.05ms-1 and the fly has a mass of 1 gram. a) If the collision lasts 10ms, what is the...

Ahh yes, my mistake many thanks :-p

Homework Statement A crate of eggs is located on the back of a truck. The truck rounds a circular bend in the road with radius of 35 meters. If the coefficient of static friction between the crate and the truck is 0.6, what is the maximum speed the truck can go without the crate...