Physics Archive: Questions from December 28, 2022
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2. The position of a particle in space is given by r(t) = (3t - 8t j) + 6tk)m where t is in seconds. Find the instantaneous velocity, in vector form, at t = 1.0 s 3. A ball is thrown from the ground
2. La posición de unat particula en el espacio està dada por \( \vec{r}(t)=\left(3 t^{3} \imath-8 t^{2} j+6 t \hat{k}\right) m \) dondet está cn segundos. Halle la velocidad instantanea, en forma v2 answers -
2 answers
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Conventional hot-water heaters consist of a tank of water maintained at a fixed temperature. The hot water is to be used when needed. The drawback is that energy is wasted because the tank loses heat
Los calentadores convencionales de agua consisten en un tanque de agua a una temperatura fija. El agua caliente se va a utilizar cuando sea necesario. Las desventajas son que se desperdicia energÃa Â2 answers -
A 23000 kg subway train initially traveling at 17.0 m/s slows to a stop in a station and then stays there long enough for its brakes to cool. The station's dimensions are 65.0 m long by 20.0 m wide by
Un tren subterráneo de \( 23000 \mathrm{~kg} \) viaja inicialmente a \( 17.0 \mathrm{~m} / \mathrm{s} \mathrm{y} \) frena para detenerse en una estación; ahà permanece el tiempo suficiente para que2 answers -
2 answers