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saveliy_v [14]
3 years ago
7

3. Work and Conservation of Energy:Calculate the height of a building if 20,000 J energy is required to 200 kg of water from a w

ellto a tank on the top of the building.of lift

Physics
1 answer:
Maru [420]3 years ago
5 0
Work = mgh,        where m = mass, g = acceleration due to gravity, h = height

Let g ≈ 10 m/s²,   mass = 200 kg

2000 J = 200 * 10 * h

200 * 10 * h = 2000

h = 2000/(200* 10)

h = 1

The height of the building is 1 m.
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A bird flying straight upward at 5 m/s drops a berry when it is 300 m above the ground. How fast is the berry going when it hits
Nikitich [7]

Answer:

v=77.62 m/s

Explanation:

Given that

h= - 300 m

speed of the bird ,u= 5 m/s

Lets take Speed of the berry when it hit the ground = v m/s

we know that ,if object is moving upward

v² = u² - 2 g h

u=Initial speed

v=Final speed

h=Height

Now by putting the values

v² = u² - 2 g h

v² = 5² - 2 x 10 x (-300)                ( take g = 10 m/s²)

v² =25 + 20 x 300

v² ==25 + 6000

v² =6025

v=77.62 m/s

Therefore the final speed of the berry will be 77.62 m/s.

5 0
3 years ago
What is the kinetic energy of a 7.26 kg bowling ball that is rolling at a speed of 2m/s
vlada-n [284]

Answer:

<h2>14.52 J</h2>

Explanation:

The kinetic energy of an object can be found by using the formula

k =  \frac{1}{2} m {v}^{2}  \\

m is the mass

v is the velocity

From the question we have

k =  \frac{1}{2}  \times 7.26 \times  {2}^{2}  \\  = 2 \times 7.26

We have the final answer as

<h3>14.52 J</h3>

Hope this helps you

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Zero field spot for opposite unequal charges
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Answer:

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The speed of a moving bullet can be determined by allowing the bullet to pass through two rotating paper disks mounted a distanc
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Answer:

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