- #1
PhysicsBeginner
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Hello everyone, I'm new to this forum. I am kinda having trouble with a physics problem. Could someone please help me out with 3 problems. Thanks.
A rocket is fired vertically with an upward acceleration of 27 m/s2. After 21 s, the engine shuts off and the rocket continues as a free particle until it reaches the ground.
(a) What is the highest point the rocket reaches?
km
(b) What is the total time the rocket is in the air?
s
(c) What is the speed of the rocket just before it hits the ground?
m/s
===================================================
Two stones are dropped from the edge of a 200-m cliff, the second stone 1.3 s after the first.
(a) How long after the second stone is dropped will the separation between the two stones be 35 m?
s
(b) At this point, how far below the clifftop is the second stone?
m
====================================================
A particle undergoes three successive displacements in a plane, as follows: 2.0 m southwest, 5.0 m east, and 8.0 m in a direction 60.0° north of east. Choose the y-axis pointing north and the x-axis pointing east.
(a) Find the components of the first displacement.
m east and m north
Find the components of the second displacement.
m east and m north
Find the components of the third displacement.
m east and m north
(b) Find the components of the resultant displacement.
m east and m north
(c) Find the magnitude and direction of the resultant displacement.
m at an angle of ° North of East
(d) Find the displacement that would be required to bring the particle back to the starting point.
m i + m j.
I got some fromt the last one correct but am having trouble with the whole concept.
A rocket is fired vertically with an upward acceleration of 27 m/s2. After 21 s, the engine shuts off and the rocket continues as a free particle until it reaches the ground.
(a) What is the highest point the rocket reaches?
km
(b) What is the total time the rocket is in the air?
s
(c) What is the speed of the rocket just before it hits the ground?
m/s
===================================================
Two stones are dropped from the edge of a 200-m cliff, the second stone 1.3 s after the first.
(a) How long after the second stone is dropped will the separation between the two stones be 35 m?
s
(b) At this point, how far below the clifftop is the second stone?
m
====================================================
A particle undergoes three successive displacements in a plane, as follows: 2.0 m southwest, 5.0 m east, and 8.0 m in a direction 60.0° north of east. Choose the y-axis pointing north and the x-axis pointing east.
(a) Find the components of the first displacement.
m east and m north
Find the components of the second displacement.
m east and m north
Find the components of the third displacement.
m east and m north
(b) Find the components of the resultant displacement.
m east and m north
(c) Find the magnitude and direction of the resultant displacement.
m at an angle of ° North of East
(d) Find the displacement that would be required to bring the particle back to the starting point.
m i + m j.
I got some fromt the last one correct but am having trouble with the whole concept.