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docker41 [41]
3 years ago
13

You are on the roof of the physics building 46.0 meters above theground. Your physics professor, who is 1.8 meters tall, is walk

ing alongside the building at a constant speed of 1.20 meters per second. If you wish to drop an egg on your professor’s head, where should the professor be when v=you release the egg? Assume the egg is in free fall with no losses due to friction or air resistance.
Physics
1 answer:
Kisachek [45]3 years ago
8 0

Answer:

The professor should be d=3.6m away of the impact point, walking towards it.

Explanation:

We will calculate how much time an egg takes to fall from the initial position to the final position, and then use that time to calculate how much distance the professor moved.

We use the equation for accelerated motion (on the vertical direction):

y_f=y_i+v_{0y}t+\frac{a_yt^2}{2}

Since it departs from rest and the acceleration is that of gravity, we have:

y_f=y_i+\frac{gt^2}{2}

Which means:

t=\sqrt{\frac{2(y_f-y_i)}{g}}

Having the ground as reference and taking the upwards direction as positive, for our values we have:

t=\sqrt{\frac{2(1.8m-46m)}{-9.8m/s^2}}=3s

And in that time the professor moved d=vt=(1.2m/s)(3s)=3.6m

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Nuclear sizes are expressed in a unit named
o-na [289]

Answer:

Answer is A) Fermi

Explanation:

Fermi is the expressive unit for nuclear sizes. Fermi = 10^-15 meter.

4 0
3 years ago
Which of the following is NOT a function of the lens in the eye?
tatyana61 [14]

Answer:

it is a light receptor that generates nerve signals that are sent to the brain

Explanation:

the lens are like the glasses, this means that is used to see things better. You just put them in your eye and that's all it's not connected to the brain

8 0
2 years ago
What is the potential difference (voltage) if the resistance of 20 ohms produces a current of 10 amperes?
JulijaS [17]

Answer:

200 volts

Explanation:

Ohm's Law: V = IR

I = 10 A

R = 20 ohms

V = (10)(20) = 200 volts

8 0
2 years ago
We now have an algebraic expression with only one variable, which can be solved. Once we have that, we can plug it back into one
Len [333]

Answer:

A=1

B=-2

Explanation:

Part A and B of the question wasn't given, however, I attached the relevant parts to solve this question as follows.

From part B as attached, it shows that the right option is C which is

2A+3B=-4

Substituting B with 3A-5 then we form the second equation as shown

2A+3(3A-5)=-4

By simplifying the above equation, we obtain

2A+9A-15=-4

Re-arranging, then

11A=-4+15

Finally

11A=11

A=1

To obtain B, we already know that 3A-5 so substituting the value of A into the above then we obtain

B=3(1)-5=-2

Therefore, required values are 1 and -2

3 0
3 years ago
Which of the following is a subatomic particle?
mr Goodwill [35]

Answer:

neutron.

Explanation:

subatomic particles include,

neutron.

proton.

electron.

hope it helps. :)

4 0
2 years ago
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