Un pedazo de hielo el hielo s a -10°C se encuentra en un recipiente cerrado de material aislante sin aire y se enciende un bombillo adentro del recipiente a cierta distancia del hielo, se puede afirmar que la temperatura del hielo (A) aumenta, porque se transfiere calor por radiación (B) aumenta, porque se transfiere calor por convección (C) aumenta, porque se transfiere calor por conducción(contacto) (D) no cambia, porque no hay contacto entre el bombillo y el hielo.

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

The heliocentric and the geocentric models of the solar system included these central principles