Recent content by dogcat

Homework Statement A 25 cm-long simple pendulum is hanging vertically inside a small car which is at rest. The mass of the bob is 2 grams, its charge is 5\times 10^{-8} coulomb. The vehicle is in uniform electric field, and then it will travel in this field. The electric field points...

Thanks but don't think that there are so much difference between them. Any other ideas?

Homework Statement How can you heat 1 \,\mathrm{kg} mineral water which is at a temperature of 0 \,{}^\circ \mathrm{C} to at least 60 \,{}^\circ \mathrm{C} with using 1 \,\mathrm{kg} plain water at a temperature of 100 \,{}^\circ \mathrm{C}? Homework Equations \Delta Q = mc\Delta T The...

Nobody :confused: Somebody PLEASE!

It isn't in English so I think that it wouldn't help. But it is exactly like I posted. No more data and information that's why I really don't know how to solve it. (I was also quite surprised by the 3 seconds and the 1.5 m but it is correct.)

If we drop a ball from 1.5 m it is bouncing for 3 seconds. At what velocity should we bounce the ball in order to make it reach the height of 1.5 m?

Calculate the lattice constant of a body-centered cubic iron crystal using the molar mass of iron, the density of iron and the Avogadro number.