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SSSSS [86.1K]
4 years ago
10

An inventive child named Nick wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rop

e that passes over a frictionless pulley (Fig. P5.81), Nick pulls on the loose end of the rope with such a force that the spring scale reads 250 N. Nick's true weight is 320 N, and the chair weighs 160 N. Nick’s feet are not touching the ground. (a) Draw a pair of diagrams showing the forces for Nick and the chair considered as separate systems and another diagram for Nick and the chair considered as one system. (b) Show that the acceleration of the system is upward and find its magnitude. (c) Find the force Nick exerts on the chair.

Physics
1 answer:
jeyben [28]4 years ago
4 0
A) diagram is shown on the image below 

b) Mass m = 450/9.8 = 45.918 KgNet upward force = T + T = 2T = 620 NNet downward force = 290 + 160 = 450 NResultant force F = Net upward force - Net downward force                     ma = 620 - 450           45.918 a = 170   Acceleration    a = 170/45.918 = 3.7 m/s^2   (upward)Here  Net upward force  > Net downward force, So the resultant force directed upwards, hence acceleration will be upward.   

(c)Consider the case of boy alone, then from Newtons law of motion we can write                                      Net force F = n + T - 290                                                   ma = n + 310 - 290 where m = 290/9.8 = 29.59 Kg                                     29.59 * 3.7 = n + 20                                            109.483 = n + 20                                                      n = 89.483 N               

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Elza [17]
<h2>Answer: Medium </h2>

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In addition, it is the medium that will define, the propagation speed of the wave, according to its specific physical characteristics.

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5 0
3 years ago
What has more energy a 2 kg mass at 10 m/s or a 2 kg mass 5 m above the ground
Alexxandr [17]

Answer:

Both have same energy

Explanation:

Given:

Sample 1

Mass m = 2 kg

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Sample 2

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Computation:

In sample 1

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Ke = 100 joule

In sample 2

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3 years ago
How is Newton’s third law of motion involved when you jump straight upward?
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<span>Newtons 3rd law of motion states that action and reaction are equal and opposite. How it applies in this statement is that when you jump straight upward you hit the floor and you experience an equal magnitude of force against your feet, because force always acts as a result of two objects and whenever forces occur they do so in pairs of equal magnitude acting in opposite directions. I hope this helps!</span><span>
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3 years ago
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Answer:

A: 0.26

Explanation:

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2 years ago
An electric device, which heats water by immersing a resistance wire in the water, generates 50 cal of heat per second when an e
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