Question

Помогите пожалуйста 1)На биллиардном столе лежит один шарик. На него налетает другой шарик. Может ли быть так, что после столкновения скорость обоих шаров будет одинаковой и равной начальной скорости налетающего шарика а)да б)нет, это противоречит закону сохранения энергии 2)Мяч массой 600 грамм упал на землю с высоты 1 метр, а отскочил на высоту 0,4 метра. Сколько процентов первоначальной энергии выделилось в тепло после удара? а)60% б)30% в)40% д)50%

Answer 1

Ответ:

вариант а)

Объяснение:

Если думать по логически 600 грамм упал на землю с высоты 1 метр

Answer 2

Can the speeds of two balls be the same after collision?

The answer is no, the speeds of two balls cannot be the same after a collision. This would violate the law of conservation of energy. When two objects collide, the total kinetic energy before the collision should be equal to the total kinetic energy after the collision. In an elastic collision, where there is no loss of kinetic energy, the relative speeds of the two objects may change, but the total kinetic energy remains the same. In an inelastic collision, some kinetic energy is lost, usually in the form of heat or deformation. Therefore, the speeds of the balls after the collision will be different from the initial speed of the incoming ball. [[1]]

What percentage of the initial energy is dissipated as heat after the ball bounces?

To calculate the percentage of the initial energy dissipated as heat after the ball bounces, we need to compare the initial kinetic energy with the final kinetic energy after the bounce.

Given: - Mass of the ball: 600 grams - Initial height: 1 meter - Bounce height: 0.4 meters

To calculate the initial kinetic energy, we can use the formula: Initial kinetic energy = 0.5 * mass * (initial velocity)^2

Since the initial velocity is not provided, we cannot calculate the exact percentage of energy dissipated as heat. However, we can make an estimation assuming that the initial velocity is zero (the ball is dropped from rest).

Using this assumption, the initial kinetic energy would be zero. Therefore, the percentage of the initial energy dissipated as heat after the bounce would be 100%. However, this is an unrealistic scenario as the ball would not bounce at all if the initial velocity is zero.

In reality, the ball would have an initial velocity when it is dropped, and the percentage of energy dissipated as heat would be less than 100%. Without the initial velocity value, we cannot calculate the exact percentage.