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A 2.00 kg block hangs from a spring balance calibrated in Newtons that is attached to the ceiling of an elevator.(a) What does the balance read when the elevator is ascending with a constant speed of 29 m/s?? N(b) What does the balance read when the elevator is descending with a constant speed of 25 m/s?? N(c) What does the balance read when the elevator is ascending at 39 m/s and gaining speed at a rate of 10 m/s2?? N(d) Suppose that from t = 0 to t = 4.9 s, the elevator ascends at a constant speed of 10 m/s. Its speed is then steadily reduced to zero during the next 3.2 s, so that it is at rest at t = 8.1 s. Describe the reading of the scale during the interval 0 < t < 8.1 s.T0 ? 4.9 = NT4.9 ? 8.1 = N

Respuesta :

Answer:

Part a)

[tex]Reading = 2.00 kg[/tex]

Part b)

[tex]Reading = 2.00 kg[/tex]

Part c)

[tex]Reading = 4.04 kg[/tex]

Part d)

from t = 0 to t = 4.9 s

so the reading of the scale will be same as that of weight of the block

Then its speed will reduce to zero in next 3.2 s

from t = 4.9 to t = 8.1 s

The reading of the scale will be less than the actual mass

Explanation:

Part a)

When elevator is ascending with constant speed then we will have

[tex]F_{net} = 0[/tex]

[tex]T - mg = 0[/tex]

[tex]T = mg[/tex]

So it will read same as that of the mass

[tex]Reading = 2.00 kg[/tex]

Part b)

When elevator is decending with constant speed then we will have

[tex]F_{net} = 0[/tex]

[tex]T - mg = 0[/tex]

[tex]T = mg[/tex]

So it will read same as that of the mass

[tex]Reading = 2.00 kg[/tex]

Part c)

When elevator is ascending with constant speed 39 m/s and acceleration 10 m/s/s then we will have

[tex]F_{net} = ma[/tex]

[tex]T - mg = ma[/tex]

[tex]T = mg + ma[/tex]

Reading is given as

[tex]Reading = \frac{mg + ma}{g}[/tex]

[tex]Reading = 2.00\frac{9.81 + 10}{9.81}[/tex]

[tex]Reading = 4.04 kg[/tex]

Part d)

Here the speed of the elevator is constant initially

from t = 0 to t = 4.9 s

so the reading of the scale will be same as that of weight of the block

Then its speed will reduce to zero in next 3.2 s

from t = 4.9 to t = 8.1 s

The reading of the scale will be less than the actual mass

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