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miss Akunina [59]
2 years ago
6

4 (a) (1) Which lens is a converging lens with the greatest power?

Physics
1 answer:
SOVA2 [1]2 years ago
3 0

Answer:

Answer

Explanation:

please like and mark be mrain list

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The bob of a pendulum swings back and forth with a total mechanical energy of 300 J. What is the kinetic energy of the bob when
zhenek [66]

at the lowest point in the trajector, the kinetic energy of the bob is 300 J.

Explanation:

The total mechanical energy of the bob at any point of its motion is given by

E=KE+PE

Where

KE=\frac{1}{2}mv^2 is the kinetic energy, where

m is the mass of the bob

v is its speed

PE=mgh is the gravitational potential energy, where

g is the acceleration of gravity

h is the height of the bob, measured with respect to the lowest point of the trajector

In absence of friction, the total mechanical energy E remains constant. So we have:

- When the bob swings upward, the PE increases (because h increases) and the KE decreases (so the speed decreases). At the highest point in the trajector, the speed of the bob is zero (v=0), so its KE is also zero and all the mechanical energy is potential energy: U = 300 J

- When the bob swings downward, the PE decreases (because h decreases) and the KE increases (so the speed increases). At the lowest point in the trajectory, the height has become zero (h=0), so the PE is zero and all the mechanical energy is kinetic energy: KE = 300 J

Therefore, at the lowest point in the trajector, the kinetic energy of the bob is 300 J.

Learn more about kinetic energy:

brainly.com/question/6536722

#LearnwithBrainly

4 0
3 years ago
The difference between the speed of sound n air at 0°C and the speed of sound in air at 20°c is that... A. Cooler air molecules
sergejj [24]
Heat, like sound, is kinetic energy. Molecules at higher temperatures heave more energy, thus they can vibrate faster. Since the molecules vibrate faster, sound waves can travel more quickly. 

So the answer is A.
7 0
3 years ago
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What is a target ceiling ?
zloy xaker [14]

Answer:

Target ceiling. the upper limit of your physical activity. Target fitness zone. Above the threshold of training and below the target ceiling.

Hope this helps. Can u give me brainliest

Explanation:

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3 years ago
Why is Portland,Oregon a good city for biking
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Portland, Oregon is a good city for biking because of all the biking lanes, also there is not that many cars driving, people are mostly walking.<span />
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Wood is burned to heat a house. this is a example of the conversion of
LenaWriter [7]

Answer:Combustion

Explanation:The chemical reaction is called combustion and requires oxygen. Combustion changes the potential chemical energy into kinetic energy in form of heat.

7 0
3 years ago
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