Una pieza cuadrada de hierro tiene un volumen total de 400 cm3. Después de aserrar la pieza por la mitad, se sometió a una temperatura más alta, cuyo aumento es equivalente a 30ºC. Sabiendo que el coeficiente 5〖x10〗^(-6) 〖°C〗^(-1) ¿Cuál será el volumen final de esta mitad de la pieza? ayuda enserio

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

The plum pudding model of the atom state that ?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.