Recent content by Hoejer

No help?

Isn't that given in the deacceleration? Deacceleration = -19.4/3sec. = -6-47 m/s^2 ? Otherwise a hint would be cool!

Which isn't true as looking in table it is around 1900 J/(kg*K)

the the mass of the calorimeter must be 75/387 = 0.193 kg = 193 g Which then means C_pet*300(22-100)+387*100(22-17.8)+387*193(22-17.8)=0 C_pet = 20.4 J(kg/K)

Homework Statement A copper calorimeter with the heatcapacity of 75 J/K has 300 g of petrolium in it. The starttemp. is 17.8 C. A kobberweight of 100 g. is 100Celcius. It is being put in the petroleum, where the temperature ends up being 22 C. The specifik heatcapacity of coppe ris 387J(kg/K)...

Homework Statement I want to calculate the traveled length of a car. A traveling car with a acceleration from 0 m/s to 19.4 m/s in 10 sec. From there it has a speed of 19.4 m/s for 11 sec. After the 21 sec. the car hit the brakes, and deaccelerates to 0m/s in 3 sec. Homework Equations...