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Alona [7]
2 years ago
8

A ball of 10kg falls from rest from a height of 150m, Neglating air resistance, calculate its kinetic energy after falling a dis

tance of 40m. Take g=10m/s
Physics
1 answer:
GaryK [48]2 years ago
3 0

Answer: 3920\ J

Explanation:

Given

mass of ball m=10 kg

It is placed at a height of 150 m

It is dropped from the height and allowed to free fall for 40 m

Velocity acquired by the ball during this fall is given by v^2-u^2=2as

Insert u=0, a=g

\Rightarrow v^2-0=2\times 9.8\times 40\\\Rightarrow v=\sqrt{784}\\\Rightarrow v=28\ m/s

Kinetic energy at this instant

K.E.=\dfrac{1}{2}\times 10\times 28^2\\\\\Rightarrow K.E.=3920\ J

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Answer:

The sound intensity level in the car is 57.2 dB.

Explanation:

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Hope this Helps!!!

8 0
3 years ago
Oscilloscope amplitude and frequency problem. Study the above graph. The volts/div dial is set to 2 volts/div and the time/div d
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Answer:

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Explanation:

Note: The missing picture in question is attached for your review.

Given:

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As can be seen in attached picture, 3 division are there for one complete cycle of waveform,so,

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Since,

Frequency = \frac{1}{Time Period}\\Frequency = \frac{1}{15m}\\Frequency = 0.067 kHz

8 0
3 years ago
Belly-flop Bernie dives from atop a tall flagpole into a swimming pool below. His potential energy at the top is 7000 J (relativ
elena55 [62]

Answer:

KE₂ = 6000 J

Explanation:

Given that

Potential energy at top U₁= 7000 J

Potential energy at bottom U₂= 1000 J

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Lets take kinetic energy at bottom level =  KE₂

Now from energy conservation

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Now by putting the values

U₁+ KE₁= U₂+ KE₂

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myrzilka [38]

Answer:

3. at new Moon only when the Moon is on the ecliptic.

Explanation:

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7 0
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