Question

100 баллов Маленький брусок с массой m=0,5 кг соскользнул с шероховатой наклонной поверхности с высоты h=3 метра и приобрёл у основания 3м/с Найти работу силы трения

Answer 1

Ответ:

m=0,5

h=3 3m/c 0,5×3+3=4,5вот оветь

Answer 2

Problem Analysis

We are given the following information: - Mass of the small block, m = 0.5 kg - Height from which the block slides down, h = 3 meters - Velocity of the block at the base of the incline, v = 3 m/s

We need to find the work done by the force of friction.

Solution

To find the work done by the force of friction, we need to calculate the distance traveled by the block along the incline.

We can use the principle of conservation of mechanical energy to find the distance traveled. The initial mechanical energy of the block is equal to its final mechanical energy.

The initial mechanical energy is given by the potential energy at the top of the incline: E_initial = m * g * h

The final mechanical energy is given by the sum of the kinetic energy and potential energy at the base of the incline: E_final = (1/2) * m * v^2 + m * g * 0

Since the mechanical energy is conserved, we can equate the initial and final energies: m * g * h = (1/2) * m * v^2

Simplifying the equation, we can solve for v: v = sqrt(2 * g * h)

Now that we have the velocity at the base of the incline, we can calculate the distance traveled using the equation: d = v^2 / (2 * g)

Finally, we can find the work done by the force of friction using the equation: Work = force of friction * distance

Calculation

Let's calculate the values step by step:

1. Calculate the velocity at the base of the incline: v = sqrt(2 * g * h) v = sqrt(2 * 9.8 m/s^2 * 3 m) v ≈ 7.67 m/s

2. Calculate the distance traveled: d = v^2 / (2 * g) d = (7.67 m/s)^2 / (2 * 9.8 m/s^2) d ≈ 3.73 m

3. Calculate the work done by the force of friction: Work = force of friction * distance Since the force of friction is not given, we cannot calculate the exact value of the work done by the force of friction without additional information.

Conclusion

In conclusion, the work done by the force of friction cannot be determined without knowing the exact value of the force of friction.