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emmasim [6.3K]
3 years ago
9

Anna needs to move a box of paperback books across the room. If she applies a force of 20 newtons to the box, what is the magnit

ude of the force exerted by the box on Anna?
Physics
2 answers:
vlabodo [156]3 years ago
5 0
Newton's third law tells us that for every force there is an equal and opposite force.  This means that if Anna exerts a force of 20 Newtons on the box, the box exerts a force of 20 Newtons on Anna.
ycow [4]3 years ago
3 0

Answer:

The magnitude of the force exerted by the box on Anna is 20 newtons.

Explanation:

It is given that, Anna needs to move a box of paperback books across the room. If she applies a force of 20 newtons to the box. We need to find the magnitude of the force exerted by the box on Anna.

The force exerted by the box on Anna is 20 newtons but it acts in the opposite direction as per Newton's third law of motion. The third law of motion explains the impact of forces i.e. action and reaction force.

So, the magnitude of the force exerted by the box on Anna is also 20 newtons. Hence, this is the required solution.

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Plane a travels at 900km/h and plane b travels at 250/5.which plane travels faster
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Explanation:

We have,

Speed of plane a is 900 km/h

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It is required to find which plane is faster. To find which plane is faster, we need to compare their speeds.

Speed of a plane a is 900 km/h and that of plane b is 50 km/h. So, we can say that plane a is moving faster.

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A series circuit has two 10-ohm bulb is added in a series. Technician A says that the three bulbs will be dimmer than when only
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Answer:

Technician  A  is right. The situation will happens even with only two bulbs in series

Explanation:

We must take into account that

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3.-Nominal voltage for bulbs are specify for houses voltages you find between fase and neutral wires for instance in Venezuela 120 (v).

4.-In a imaginary circuit of only one bulb, the nominal voltage will be applied and the bulb will operates correctly, but when you add another bulb (in series) the nominal voltage will split  between the two bulbs ( we  could find a situation such as the first bulb work properly but the second one does not). The voltage split according to Ohms law (in such way that the sum of voltage between the terminal of the first bulb plus the voltage at terminals of the second one are equal to nominal voltage.

For that reason all the bulbs are connected in parallel in wich case all of them will operate with the common voltage

4 0
3 years ago
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Explanation:

8 0
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A 0.091-in-diameter electrical wire at 90°F is covered by 0.02-in-thick plastic insulation (k = 0.075 Btu/h·ft·°F). The wire is
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Answer:

The critical radius of the plastic insulation is 0.72 inches.

Explanation:

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Hence, The critical radius of the plastic insulation is 0.72 inches.

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3 years ago
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