Question

Срочно! Физика! 50 баллов. 1. Пластилиновый шар массой 400 г упал на землю со скоростью 5 м/с. Определите изменение импульса шарика. 2. Определите, как изменится кинетическая энергия тела, если скорость движения снизится в 4 раза. А) уменьшится в 16 раз Б) уменьшится в 8 раз в) уменьшится в 4 раза Г) увеличится в 8 раз Д) увеличится в 16 раз

Answer 1

Ответ:

соударение не упругое, и конечный импульс =0, начальный импульс равен 0.4кг*5м/с=2кгм/с. изменение 2кгм/с

кинетическая энергия зависит от квадрата скорости, значит при снижении скорости в 4 раза энергия уменьшится в 16 раз

Объяснение:

Answer 2

Ответ:

1

Объяснение:

1. p=mU

p=0.4•5=2кг•м/с

Answer 3

Calculating Change in Momentum

To calculate the change in momentum of the clay ball, we can use the formula:

Change in momentum = Final momentum - Initial momentum

The initial momentum of the clay ball can be calculated using the formula:

Initial momentum = mass × initial velocity

Given: - Mass of the clay ball (m) = 400 g = 0.4 kg - Initial velocity (u) = 5 m/s

Using these values, we can calculate the initial momentum: Initial momentum = 0.4 kg × 5 m/s = 2 kg m/s

Now, the final momentum can be calculated using the formula: Final momentum = mass × final velocity

Since the clay ball falls to the ground and comes to a stop, the final velocity is 0 m/s. Therefore, the final momentum is 0.

Now, we can calculate the change in momentum: Change in momentum = 0 - 2 kg m/s = -2 kg m/s

So, the change in momentum of the clay ball is -2 kg m/s.

Change in Kinetic Energy

The change in kinetic energy can be calculated using the formula:

Change in kinetic energy = Final kinetic energy - Initial kinetic energy

The initial kinetic energy of the clay ball can be calculated using the formula:

Initial kinetic energy = 0.5 × mass × (initial velocity)^2

Given: - Mass of the clay ball (m) = 400 g = 0.4 kg - Initial velocity (u) = 5 m/s

Using these values, we can calculate the initial kinetic energy: Initial kinetic energy = 0.5 × 0.4 kg × (5 m/s)^2 = 5 J

Now, the final kinetic energy can be calculated using the formula: Final kinetic energy = 0.5 × mass × (final velocity)^2

If the velocity decreases by 4 times, the final velocity becomes 5 m/s / 4 = 1.25 m/s.

Using this final velocity, we can calculate the final kinetic energy: Final kinetic energy = 0.5 × 0.4 kg × (1.25 m/s)^2 = 0.3125 J

Now, we can calculate the change in kinetic energy: Change in kinetic energy = 0.3125 J - 5 J = -4.6875 J

So, the change in kinetic energy of the clay ball is -4.6875 J.

Therefore, the correct answer to the question is A) уменьшится в 16 раз.