6. A rocket is fired vertically upwards from rest and burns fuel at a constant rate k, and the exhaust gases are ejected vertically downwards with constant speed u relative to the rocket. The initial mass of the rocket is M', half of which is fuel. During the time that the fuel is being...
1)A hot-air balloon of mass M is descending vertically with downward acceleration of magnitude a. How much mass (ballast) must be thrown out to give the balloon an upward acceleration of magnitude a? Assume that the upward force from the air (the lift) does not change because of the decrease...
7.6 is the horizontal velocity
6.1 is the vertical velocity
so
4a) 0=6.1^2+2(-10)s
s=1.8605m
1.8605m+9.1m=10.9605m
4b)s=ut+0.5at^2
-9.1=6.1t+0.5(-10)t^2
t=2.0906s
what is the horizontal speed? is it 7.1*2.0906=15.8886m
is it correct??
how about c) and d) how to solve?
5a) v=40kpi (rad/s)??
4)
i already solve 4a)10.9605m
4b)s=ut+0.5at^2
-9.1=6.1t+0.5(-10)t^2
t=2.0906s
what is the horizontal speed? is it 7.1*2.0906=ans??
how to solve b) and c)??
4)
A ball is shot from the ground into the air. At a height of 9.1m, its velocity is observed to be v =7.6 i + 6.1 j in meters per second. (a) To what maximum height does the ball rise? (b) What horizontal distance does the ball travel? What are (c) the magnitude and (d) the direction of...