Una barra caliente de cobre cuya masa es de 1.5 kg se introduce en 4 kg de agua elevando su temperatura de 18°C a 28°C. ¿Qué temperatura inicial tenía la barra de cobre?

Aparticle moves according to a law of motion s = f(t), 0 ≤ t ≤ 12, where t is measured in seconds and s in feet. f(t) = cos(πt/6) (a) find the velocity at time t (in ft/s).

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?