Question

Скользящая по льду шайба массой 160 г ударяется о лежащую льдинку. После удара шайба скользит в прежнем направлении, но модуль её скорость уменьшилась вдвое. Скорость же льдинки стала равной начальной скорости шайбы. Чему равна масса льдинки?

Answer 1

Прости за такой ответ но, поройся в учебнике, там должно быть пояснение как решить это задачу (или подобную). Учителя не задают то - что не проходили ранее

Answer 2

Calculation of the Mass of the Ice Floe

To calculate the mass of the ice floe, we can use the principle of conservation of momentum. According to this principle, the total momentum before the collision is equal to the total momentum after the collision.

Let's denote the mass of the hockey puck as m and its initial velocity as v. After the collision, the puck's velocity is reduced to half its initial value, so its final velocity is v/2. The mass of the ice floe is denoted as M, and its initial velocity is equal to the initial velocity of the puck, v.

Using the principle of conservation of momentum, we can write the equation:

m * v = (m/2) * (v/2) + M * v

Simplifying the equation, we get:

2mv = mv/4 + Mv

Now, let's solve for M:

2mv - mv/4 = Mv

8mv - mv = 4Mv

7mv = 4Mv

M = (7mv) / (4v)

Simplifying further, we find:

M = 7m/4

Therefore, the mass of the ice floe is equal to 7/4 times the mass of the hockey puck.

Please note that the specific values of m and v were not provided in the question, so we cannot calculate the exact mass of the ice floe. However, we can conclude that the mass of the ice floe is greater than the mass of the hockey puck.