|
Astronauts in space can't stand at one place, because |
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|
(a) |
there is no gravity |
(b) |
viscous forces of the atmosphere are very strong |
|
(c) |
solar wind exert an upward force |
(d) |
atmospheric pressure is very low |
|
Astronauts in space can't stand at one place, because |
|||
|
(a) |
there is no gravity |
(b) |
viscous forces of the atmosphere are very strong |
|
(c) |
solar wind exert an upward force |
(d) |
atmospheric pressure is very low |