Question

The Greenpeace balloonThe balloon can only be launched in low winds (up to 10 knots). In many parts of the world, this means it can only be flown two hours after sunrise and two hours before sunset.This is because during the day the sun heats up the atmosphere and creates thermals that make balloon flying dangerous. In winter months, when the sun's heat is less powerful, there is a better chance of making daytime flights.The balloon can stay airborne for a maximum of two hours in normal conditions (a cool temperature under 2 000 metres above sea level).There are two types of balloon flight – free or tethered. During free flights, once launched, the balloon is carried in the general direction of the wind. For tethered flights the wind speed must be less than for free flights (about 8 knots maximum), because the balloon is in effect resisting the wind.Greenpeace. Disponível em: http://www.greenpeace.org. Acesso em: 7 dez. 2014.O voo do balão Greenpeace fica mais perigoso durante o dia, uma vez que ele podea) revoar em correntes quentes.b) planar quando estiver na direção do vento.c) flutuar um máximo de 2 horas no nível do mar.d) voar apenas no inverno, devido às baixas temperaturas.e) pairar de forma livre quando a velocidade do vento for menor que 8 nós.

Answer 1

eu acho q é a letra A. Por causa da frase: "during the day the sun heats up the atmosphere and creates thermals that make the baloon flying dangerous"

tomara que eu ajude

bjosmil