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Plzzzz answer physics energy question?
Plzzzz answer physics energy question?
PLZZ EXPLAIN UR ANSWERS IN STEPS THANKS
A 150 kg satellite in deep dark space fires a thruster that provides a net force 10 N of thrust. How far has the satellite traveled by the time the velocity changed by 15 m/s?
A hockey puck hits the crossbar of the net and bounces upwards with a speed of 14 m/s. What is the puck's maximum height?
1 Answer
- simplicitusLv 71 decade agoFavorite Answer
1 - this is a terrible question! If you are dealing with a satellite, then it is in orbit. That means it already has a velocity and an acceleration which are not given. Even without an thrust, its velocity will change because of that acceleration and we don't know how much.
What they really want you to show is that you know the basic equations of motion under constant acceleration:
F = MA
Vf = Vi + A T
D = Vi T + (1/2) A T^2
Given F and M you can determine the acceleration A.
Given A and the difference between the initial velocity Vi and the final velocity Vf, you can compute the time interval T.
Given A and the time interval, you could compute the distance if you only knew the initial velocity Vi. So I suggest you assume it is 0.
But the people who made this question up may have understood equation, but they clearly didn't understand physics! :-(
#2 The same equations apply with the acceleration being that due to gravity in the down direction.
A = g is approximately 9.8 m/s^2
You are given Vi (14 m/s) and Vf (0 at the maximum height) so you can compute T and with T compute D.
