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wlad13 [49]
4 years ago
9

If you drop a 0.05 kg egg from 2m, what do you predict would be the velocity of the egg before it hits the ground, neglecting ai

r resistance?
(I'm a bit confused, can someone explain?)​
Physics
2 answers:
Ratling [72]4 years ago
7 0

Explanation:

i think you have to find the velocity by using its wight times the gravity of the earth times the distance it fell?

look in google for a formula  the use these sign, w and g ,d

qwelly [4]4 years ago
7 0

This kind of problems becomes extremely easy if you use the consevation of energy. We know that, at any given moment, the total energy is constant.

Specifically, the energy is given by the sum of the kinetic and potential energy:

E=K+U=\dfrac{1}{2}mv^2+mgh

At the beginning, the egg has no velocity (v=0), it's mass is 0.05, and its height is 2m, so the initial energy is

E_i=\dfrac{1}{2}\cdot 0.05\cdot 0^2+0.05\cdot g\cdot 2 = 0.1g

When the egg hits the ground, its height has become zero. So, the total energy is

E_f=\dfrac{1}{2}\cdot 0.05\cdot v^2+0.05\cdot g\cdot 0 = 0.1v^2

The initial and final energies must be the same, so we have

0.1v^2=0.1g\iff v^2=g \iff v=\pm\sqrt{g}

Discarding the negative solution, which woudln't make sense, we have

v=\sqrt{g}

where g is the acceleration due to gravity

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Answer:

2990W

Explanation:

Given parameters:

Voltage  = 230V

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To solve this problem;

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5 0
3 years ago
Can someone please help me with this? I'm so confused
bagirrra123 [75]

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This is the whole idea of the roller coaster.  A machine drags it up to
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A). and B).
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C). The ball can never rise higher than the height it was dropped from.
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E). Same idea.  Here it looks like the drop-height is the same as the
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3 0
3 years ago
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r-ruslan [8.4K]

Answer:

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4 0
3 years ago
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svp [43]

Answer:

20g

Explanation:

Given parameters:

Quantity of heat  = 240calories

Initial temperature  = 80°C

Final temperature  = 68°C

Unknown:

Mass of water = ?

Solution;

To solve this problem, we use the expression:

         Q  = m c (t₂  - t₁)

Q is the quantity of heat

m is the mass

c is the specific heat = 1 cal/g°C

t₂ is the final temperature

t₁ is the initial temperature

  Insert the parameters and solve;

  Change in temperature is an absolute value

          240 = m x 1 x (68 - 80)

           m  = 20g

3 0
3 years ago
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Vanyuwa [196]
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5 0
3 years ago
Read 2 more answers
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