You are on the roof of the physics building, 46.0 m above the ground. Your physics professor, who is 1.80 tall, is walking along side the building at

Suman Cole

Suman Cole

Answered question

2021-03-07

You are on the roof of the physics building, 46.0 m above the ground. Your physics professor, who is 1.80 tall, is walking along side the building at a constant speed of 1.20 m/s. If you wish to drop an egg on your professor's head, how far from the building should the professor be when you release the egg? Assume that the egg is in free fall.Take the free fall acceleration to be 9.80 ms2

Answer & Explanation

Bertha Stark

Bertha Stark

Skilled2021-03-08Added 96 answers

Height of building (h) = 46.0 m 
Height of walling person (h1) = 1.2 ms 
The egg's initial speed is (v0x) =0 ms 
Speed of egg (v)=2gh, where g=9.8ms2 
=2(9.8)(46)=30.03 ms 
Let the egg fall on the people.

Jeffrey Jordon

Jeffrey Jordon

Expert2021-09-24Added 2605 answers

S=μt+12gt2

44.2=0t+12×98×t2

t2=3s

 Professor should be at distance of 3×1.23.6 m

RizerMix

RizerMix

Expert2023-06-11Added 656 answers

To solve the problem, we can use the equation of motion for an object in free fall:
h=12gt2
where h is the height, g is the acceleration due to gravity, and t is the time taken.
In this case, the height h is the distance between the roof and the ground, which is given as 46.0 m. The acceleration due to gravity g is 9.80 m/s^2.
We want to find the time it takes for the egg to fall from the roof to the ground. We can rearrange the equation to solve for t:
t=2hg
Substituting the values into the equation:
t=2×46.09.80
Vasquez

Vasquez

Expert2023-06-11Added 669 answers

The time it takes for the egg to fall from the roof to the ground can be found using the equation:
h=12gt2
where h is the height of the building (46.0 m) and g is the acceleration due to gravity (9.80 m/s2). Solving for t, we get:
t=2hg
Now, during this time t, the professor moves a distance of v·t, where v is the velocity of the professor (1.20 m/s). Therefore, the distance d can be expressed as:
d=v·t=v·2hg
Substituting the given values, we have:
d=1.20·2·46.09.809.35 m
Therefore, the professor should be approximately 9.35 meters away from the building when you release the egg in order to hit their head.
nick1337

nick1337

Expert2023-06-11Added 777 answers

Step 1:
Let's define the following variables:
h = height of the building (46.0 m)
v0 = initial velocity of the egg (0 m/s, as it is dropped)
a = acceleration due to gravity (9.80m/s2, as it acts downwards)
t = time taken for the egg to fall
Using the kinematic equation:
h=v0t+12at2
Step 2:
We can plug in the known values and solve for t:
46.0=0·t+12·(9.80)·t2
Simplifying the equation:
46.0=4.90t2
Dividing both sides by -4.90:
t2=46.04.90
Taking the square root of both sides:
t=46.04.90
Since time cannot be negative in this context, we know that the egg will take the positive square root of the right-hand side.
Step 3:
Now, we can determine the horizontal distance traveled by the professor during this time. The professor walks at a constant speed of 1.20 m/s, so the distance traveled is given by:
d=speed·time
Substituting the values:
d=1.20·46.04.90
To find the magnitude of this distance, we can take the absolute value of the expression:
d=|1.20·46.04.90|
Therefore, the professor should be approximately 1.20·46.04.90 meters away from the building when you release the egg.

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