- #1
litheira
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1. A soccer player kicks a ball at an angle of 50° above the horizontal. The player is 10.0 m from the base of a rectangular building that is 5.0 m high (with a flat roof). The roof is 10.0 m wide. The ball is kicked with an initial speed of 15.0 m/s.
a.Show that the ball will clear the front wall of the building.
b.Does the maximum height of the ball occur while it is over the roof, before it passes over the roof, or after it passes over the roof?
c.Determine whether the ball lands on the roof or beyond the building.
d.Wherever the ball lands, determine its location relative to the back wall of the building.
e.What is the ball’s velocity in unit vector notation, just before it lands?WHAT I DID TO GET THE ANSWERS
i got these answers. I can't really show my work since I don't have a scanner or smartphone to take a pic but I did do this and tried it myself.
i got x component of initial velocity= 9.64 m/s, y component of initial velocity= 11.49 m/s, t= 1.17 s for it to reach max height using the kinematic equations for projectile motion.
I used these known variables to find the answers to a and b. then I set the height to 5 and found t for that in order to find the range covered at that point for c. Then I subtracted that figure from the total distance from the soccer player to the end of the building to find d. As for e, i don't know how to do it because i don't know how to find y.
a. max height ---> y=6.73 m so it goes over the wall. @ y=5 m, x is about 5.4 meter
b. x=11.3 m so it is while it is over the roof
c. x=17.045 m so it lands on the roof
d. x=2.95 meters before the back wall of building. i did 20- 17.045
e. i don't know how to do this
idk how to do this since x is constant and idk how to figure out the velocity of y
i just need help with e.
I figured out the other parts. thanks :)
2.JUST FIGURED THIS ONE OUT. I don't need help with it anymore. In this experiment: h ttp://www.youtube.com/watch?v=cxvsHNRXLjw, prove that the pellet does hit the doll (provided it is shot fast enough).
a.Show that the ball will clear the front wall of the building.
b.Does the maximum height of the ball occur while it is over the roof, before it passes over the roof, or after it passes over the roof?
c.Determine whether the ball lands on the roof or beyond the building.
d.Wherever the ball lands, determine its location relative to the back wall of the building.
e.What is the ball’s velocity in unit vector notation, just before it lands?WHAT I DID TO GET THE ANSWERS
i got these answers. I can't really show my work since I don't have a scanner or smartphone to take a pic but I did do this and tried it myself.
i got x component of initial velocity= 9.64 m/s, y component of initial velocity= 11.49 m/s, t= 1.17 s for it to reach max height using the kinematic equations for projectile motion.
I used these known variables to find the answers to a and b. then I set the height to 5 and found t for that in order to find the range covered at that point for c. Then I subtracted that figure from the total distance from the soccer player to the end of the building to find d. As for e, i don't know how to do it because i don't know how to find y.
a. max height ---> y=6.73 m so it goes over the wall. @ y=5 m, x is about 5.4 meter
b. x=11.3 m so it is while it is over the roof
c. x=17.045 m so it lands on the roof
d. x=2.95 meters before the back wall of building. i did 20- 17.045
e. i don't know how to do this
idk how to do this since x is constant and idk how to figure out the velocity of y
i just need help with e.
I figured out the other parts. thanks :)
2.JUST FIGURED THIS ONE OUT. I don't need help with it anymore. In this experiment: h ttp://www.youtube.com/watch?v=cxvsHNRXLjw, prove that the pellet does hit the doll (provided it is shot fast enough).
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