Question

Как изменяется кинетическая энергия львицы массой 146 кг во время охоты, если она снизит скорость бега с 10 м/с до 8 м/с.

Answer 1

Ответ: уменьшится на 292 Дж

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 2

Calculation of Change in Kinetic Energy

To calculate the change in kinetic energy of a lioness during hunting, we need to use the formula for kinetic energy:

Kinetic Energy (KE) = 0.5 * mass * velocity^2

Given: - Mass of the lioness = 146 kg - Initial velocity = 10 m/s - Final velocity = 8 m/s

Let's calculate the initial and final kinetic energies and find the difference:

Initial Kinetic Energy (KE_initial) = 0.5 * mass * initial velocity^2

Final Kinetic Energy (KE_final) = 0.5 * mass * final velocity^2

Change in Kinetic Energy (ΔKE) = KE_final - KE_initial

Calculation:

Using the given values, we can calculate the change in kinetic energy of the lioness during hunting:

Initial Kinetic Energy (KE_initial) = 0.5 * 146 kg * (10 m/s)^2

Final Kinetic Energy (KE_final) = 0.5 * 146 kg * (8 m/s)^2

Change in Kinetic Energy (ΔKE) = KE_final - KE_initial

Let's calculate the values:

KE_initial = 0.5 * 146 kg * (10 m/s)^2 = 7300 J

KE_final = 0.5 * 146 kg * (8 m/s)^2 = 4672 J

ΔKE = KE_final - KE_initial = 4672 J - 7300 J = -2628 J

Therefore, the change in kinetic energy of the lioness during hunting, when she reduces her running speed from 10 m/s to 8 m/s, is -2628 Joules. The negative sign indicates a decrease in kinetic energy.

Please note that the calculation assumes no other external forces acting on the lioness during the change in speed.