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a rocket of mass 550 kg blasts vertically from the launch pad at an acceleration of 4.2ms^. calculate :
The weight of the rocket?
the thrust of the rocket engines?
(What would be the sign of g here as if you take it negative your answer would be completely different with taking the g sign positive. G is acting downward so obviously it's negative but text book took as positive . can someone explain to me this as i don't get it at all. thanks guys .)
The weight of the rocket?
the thrust of the rocket engines?
(What would be the sign of g here as if you take it negative your answer would be completely different with taking the g sign positive. G is acting downward so obviously it's negative but text book took as positive . can someone explain to me this as i don't get it at all. thanks guys .)
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#2
(Original post by Alen.m)
a rocket of mass 550 kg blasts vertically from the launch pad at an acceleration of 4.2ms^. calculate :
The weight of the rocket?
the thrust of the rocket engines?
(What would be the sign of g here as if you take it negative your answer would be completely different with taking the g sign positive. G is acting downward so obviously it's negative but text book took as positive . can someone explain to me this as i don't get it at all. thanks guys .)
a rocket of mass 550 kg blasts vertically from the launch pad at an acceleration of 4.2ms^. calculate :
The weight of the rocket?
the thrust of the rocket engines?
(What would be the sign of g here as if you take it negative your answer would be completely different with taking the g sign positive. G is acting downward so obviously it's negative but text book took as positive . can someone explain to me this as i don't get it at all. thanks guys .)
As long as your model is correct, you can take minor freedoms in exactly the details of the model.
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so if i get G as a positive value in order to sort out different type of questions, will i get the right answer?
thanks
thanks
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#4
(Original post by Alen.m)
so if i get G as a positive value in order to sort out different type of questions, will i get the right answer?
thanks
so if i get G as a positive value in order to sort out different type of questions, will i get the right answer?
thanks
Note also that you need to work on your notation. g denotes the gravitational field strength at the earth's surface(9.81ms-2), which is the constant you need to use. G denotes the gravitational constant(6.67x10-11m3kg-1s-2), which you don't need to know at this stage.
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