Friday
November 28, 2014

Homework Help: Physics

Posted by Genevieve on Saturday, July 29, 2006 at 11:19pm.

1)A student at a window on the second floor of a high school building sees his math teacher coming along a walkway besides the building. He drops a water balloon from 18.0 m above the ground when it the teacher is 1.00 m from the point directly beneath the window. If the teacher is 170 cm tall and walks at a rate of 0.45 m/s, does the balloon hit his head? Does it him at all?
thank you very much


The teacher's head is H = 18.0 - 1.7 = 16.3 m below the window from which the water balloon is dropped. The time required to fall that distance is
t = sqrt(2H/g) = 1.82 s.
The teacher moves horizontally
t*0.45 m/s = 0.82 m in that time. If he was 1.0 m behind the impact point when it was dropped, he will be 0.18 m behind the impact point when the water balloon reaches the height of his head.

That's pretty close. You need to consider the finite size of the water balloon and the person before deciding on an answer. The teacher will have moved even closer to the balloon before it hits the ground.

I would say the water balloon would barely miss his head but probably hit his forward-extended leg before it hits the ground.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

physics - In the figure below, a student at a window on the second floor of a ...
physics - In the figure below, a student at a window on the second floor of a ...
University Physics - Building A and Building B are 30m away from each other, on ...
Math - A man on the 8th floor of a building sees a bucket (dropped by a window ...
Physics - A disgruntled physics student sees the front end of his teacher's car...
Trigonometry (Math) - A ladder 42 feet long is place so that it will reach a ...
Physics - A student at a window on the second floor of a dorm sees his moth ...
Physics - A disgruntled physics student sees the front end of his teacher's car ...
physics - an object is dropped from the window of an apartment in a high rise ...
geometry - Two buildings are separated by an alley. Joe is looking out of a ...

Search
Members