Question

К трем динамометрам, соединенным так, как показано на рисунке, подвешен груз. Показанияверхнего и нижнего динамометров 90 Н и 30 Н соответственно. Определите показания среднегодинамометра

Answer 1

90-30= 60Н 

60/2=30Н весит динамометр.

показание ср. динамометра = вес груза + вес динамометра= 30Н+30Н= 60Н

Answer 2

Calculation of the Reading of the Middle Dynamometer

To determine the reading of the middle dynamometer, we can use the principle of equilibrium. In this case, the sum of the forces acting on the system should be zero.

Let's denote the reading of the middle dynamometer as Fm.

According to the given information, the upper dynamometer reads 90 N and the lower dynamometer reads 30 N.

Since the dynamometers are connected in series, the force acting on the system can be considered as the sum of the readings of the three dynamometers.

Therefore, we can write the equation:

Fm + 90 N + 30 N = 0

Simplifying the equation, we have:

Fm = -90 N - 30 N

Calculating the sum, we get:

Fm = -120 N

Therefore, the reading of the middle dynamometer is -120 N.

Please note that the negative sign indicates that the force is acting in the opposite direction to the positive direction indicated on the dynamometer.