Question

Яку силу потрібно прикласти до вагона, який стоїть на рейках, щоб вагон почав рухатись рівнопрескорено і за час 28 с пройшов шлях 10.8 км? Маса вагона становить 17 т. Під час руху на вагон діє сила тертя, яка дорівнює 0.04 від діючої на нього сили тяжіння.​

Answer 1

Ответ:

6827,88 Н

Объяснение:

Уравнение движения (без трения)

$x(t)=0,5at^2\\t=1*60*60+28=3628 c\\10800=0,5*a*(3628)^2\\a=\frac{10800}{0,5*3628^2}\\a=0,00164$

нашли ускорение a=0,00164 м/с^2

сила "толкания" без трения равна F=ma;

F1=17000*0,00164=27,88 Н

сила трения равна F2=0,04mg;

F2=6800 Н

общая сила равна F=F1+F2;

F=6827,88 Н

Answer 2

To calculate the force required to make the wagon start moving at a constant velocity, we need to consider the forces acting on the wagon. The force required will be equal to the sum of the force of friction and the force of gravity acting on the wagon.

Given information:

- Time taken: 28 s - Distance traveled: 10.8 km - Wagon mass: 17 t - Coefficient of friction: 0.04

Calculating the force of friction:

The force of friction can be calculated using the equation:

Force of friction = coefficient of friction * force of gravity

The force of gravity can be calculated using the equation:

Force of gravity = mass * acceleration due to gravity

The acceleration due to gravity is approximately 9.8 m/s^2.

Let's calculate the force of friction:

Force of gravity = 17 t * 9.8 m/s^2

Now, we can calculate the force of friction:

Force of friction = 0.04 * (17 t * 9.8 m/s^2)

Calculating the force required to move the wagon:

The force required to move the wagon at a constant velocity can be calculated using the equation:

Force required = mass * acceleration

Since the wagon is moving at a constant velocity, the acceleration is zero. Therefore, the force required is equal to the force of friction.

Calculating the force required in newtons:

To convert the force required to newtons, we need to convert the mass from tons to kilograms. Since 1 ton is equal to 1000 kg, the mass of the wagon is:

Mass = 17 t * 1000 kg/t

Now, we can calculate the force required in newtons:

Force required = (17 t * 1000 kg/t) * 9.8 m/s^2 * 0.04

Converting the force required to kilonewtons:

To convert the force required to kilonewtons, we divide the force required by 1000:

Force required (kN) = Force required (N) / 1000

Let's calculate the force required to make the wagon start moving:

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