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artcher [175]
3 years ago
7

What’s contact force ?

Physics
2 answers:
kodGreya [7K]3 years ago
5 0

Explanation:

Contact force is any force that requires contact.  An object that exerts a force on another object by touching it is exerting a contact force.  Examples of contact force are friction and normal force.

Examples of a non-contact force are gravity and magnetism.

natima [27]3 years ago
4 0

Any force that requires contact force
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If a 54 kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3 s, what average power is generated?
lora16 [44]

Answer:

Power, P = 600 watts

Explanation:

It is given that,

Mass of sprinter, m = 54 kg

Speed, v = 10 m/s

Time taken, t = 3 s

We need to find the average power generated. The work done divided by time taken is called power generated by the sprinter i.e.

P=\dfrac{W}{t}

Work done is equal to the change in kinetic energy of the sprinter.

P=\dfrac{\dfrac{1}{2}mv^2}{t}

P=\dfrac{\dfrac{1}{2}\times 54\ kg\times (10\ m/s)^2}{3\ s}

P = 900 watts

So, the average power generated by the sprinter is 900 watts. Hence, this is the required solution.

3 0
3 years ago
What kind of organisms are able to convert sunlight into usable energy?
Tamiku [17]

Answer:

Photosynthetic organisms

Explanation:

The electromagnetic energy of sunlight is converted to chemical energy in the chlorophyll-containing cells of photosynthetic organisms. In eukaryotic cells these reactions occur in the organelle known as the chloroplast

Hope this helps! :)

4 0
3 years ago
Read 2 more answers
When is it necessary to use relativistic quantum mechanics?
Ugo [173]

Answer:

To see objects smaller than microscopic limits

Explanation:

The theory of Relativistic Quantum mechanics can be applied to particles that are massive and propagates at all velocities even those which are comparable to the speed of light and is capable to accommodate particles that are mass less. This theory find its application in atomic physics, high energy physics, etc.

It is necessary to use relativistic quantum mechanics when it is desired to see the objects that are too small to be seen with the help of microscope.

4 0
3 years ago
What test were used to find out information about the iceman
Blababa [14]
To find information, the would take DNA tests.
6 0
3 years ago
Thomson's cathode ray experiment showed that:
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I believe the best option to go with will be option C. electrons are negatively charged 
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4 years ago
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