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insens350 [35]
3 years ago
9

Forces between objects act when the objects are in direct contact or when they are not touching. Can you think of any forces tha

t can act at a distance?
Physics
2 answers:
Tju [1.3M]3 years ago
7 0

Answer:

gravity

Explanation:

Gravity as well as electrostatic and magnetic attraction and repulsion provide real life examples of forces being exerted by one object on another without them being in contact with each other. Many children are aware of magnetism and have played with fridge magnets.

ss7ja [257]3 years ago
4 0

Answer:

Magnetic, electric, and gravitational forces can be exerted, even though the objects involved do not touch each other.

Explanation:

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Drop a rock from a 5-m height and it accelerates at 9.81 m/s^2 and strikes the ground 1s later. Drop the sane rock from a height
KiRa [710]

Answer:

A. The same amount

Explanation:

The acceleration at which objects free falls to the ground on Earth is constant and its value is always 9.81 m/s^2, regardless of their mass (in this problem we neglect air resistance).

So, it doesn't matter if the two rocks are different or they are launched from different heights: their acceleration will be exactly the same.

This can be proved this way: first of all, the force of gravity exerted on every object is equal to the weight of the object,

F=mg

where m is the mass of the object and g the acceleration of gravity.

However, we also know for Newton's second law that

F=ma

where a is the acceleration of the object.

Combining the two equations,

ma=mg\\a=g

So, the acceleration of an object in free fall is exactly the acceleration of gravity.

8 0
2 years ago
An 80-kg man climbs a 6-m ladder in 12 seconds. what is his average power expended?
Molodets [167]
If the ladder is vertical, then the work done in ascending equals his increase in potential energy. 
For a man of mass (m) climbing height (h), the PE is (mgh), where g is the acceleration due to gravity. 

If he does this in time t, his average power (rate of working) is: 
mgh / t 
= 80 * 9.81 * 6 / 12 
= 392.4 W. 

If the ladder is not vertical but inclined at an angle the horizontal, the power is mgh sin(a) / t.
7 0
2 years ago
Water is used to cool down automobile engines when they get hot. Why is water used as a coolant?
Rzqust [24]
The answer is D) <span>Water has a high heat capacity.</span>
3 0
3 years ago
Read 2 more answers
Why is electric switches and boards are made up of plastic​
katovenus [111]

Answer:

so that they don't calch fire

6 0
3 years ago
Argon is compressed in a polytropic process with n 5 1.2 from 120 kpa and 108c to 800 kpa in a piston–cylinder device. determine
prohojiy [21]
A boiling pot of water (the water travels in a current throughout the pot), a hot air balloon (hot air rises, making the balloon rise) , and cup of a steaming, hot liquid (hot air rises, creating steam) are all situations where convection occurs. 
Read more on Brainly.com - brainly.com/question/1581851#readmore
5 0
3 years ago
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