Question

Чему равна полная энергия тела, массой 60кг если оно имеет потенциальную энергию 0.12 кДж и двигается со скоростью 24,4км/ч?

Answer 1

Здесь всё просто))
Е=Ек+Еп(Еп мы знаем,остается найти Ек)
Ек=масса×скорость в квадрате и всп это разделить на 2
Ек=60×6,7/2=201
Е=201+60=261Дж

Answer 2

Calculation of Total Energy

To calculate the total energy of an object, we need to consider both its potential energy and kinetic energy.

The potential energy (PE) of the object is given as 0.12 kJ.

The kinetic energy (KE) of the object can be calculated using the formula:

KE = (1/2) * m * v^2

Where: - KE is the kinetic energy - m is the mass of the object - v is the velocity of the object

Given that the mass of the object is 60 kg and it is moving with a velocity of 24.4 km/h, we need to convert the velocity to m/s before calculating the kinetic energy.

Converting 24.4 km/h to m/s: 1 km/h = 0.277778 m/s

Therefore, 24.4 km/h = 24.4 * 0.277778 m/s = 6.77778 m/s.

Now we can calculate the kinetic energy:

KE = (1/2) * 60 kg * (6.77778 m/s)^2

Calculating the kinetic energy gives us:

KE = (1/2) * 60 kg * (6.77778 m/s)^2 = 1224.4 J

Total Energy of the Object

The total energy (E) of the object is the sum of its potential energy and kinetic energy:

E = PE + KE

Substituting the values we calculated:

E = 0.12 kJ + 1224.4 J

Converting 0.12 kJ to J: 1 kJ = 1000 J

Therefore, 0.12 kJ = 0.12 * 1000 J = 120 J.

Now we can calculate the total energy:

E = 120 J + 1224.4 J = 1344.4 J

Therefore, the total energy of the object is 1344.4 Joules.