Question

Шар катится со скоростью 7,2 км/ч. Найти массу шара,если он обладает энергией 20 Дж? Каким видом энергии обладает шар?

Answer 1

Шар катится со скоростью 7,2 км/ч. Найти массу шара,если он обладает энергией 20 Дж? Каким видом энергии обладает шар?

Дано V=7,2 км/ч=2 м/с  Е=20 Дж   m - ?

E=m*V^2/2
m=2*E/V^2=2*20/4=10 кг
Ответ m=10 кг

Answer 2

Calculating the Mass of the Sphere

To calculate the mass of the sphere, we can use the formula for kinetic energy:

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

Given that the sphere has a kinetic energy of 20 J and a velocity of 7.2 km/h, we can use the formula to find the mass of the sphere.

First, we need to convert the velocity from km/h to m/s: - 7.2 km/h = 7.2 * (1000 m / 1 km) * (1 h / 3600 s) = 2 m/s

Now, we can use the formula to find the mass: - 20 J = 0.5 * mass * (2 m/s)^2 - Solving for mass: mass = 20 J / (0.5 * (2 m/s)^2)

Let's calculate the mass using the given values.

Calculating the Mass

The mass of the sphere is calculated as follows: - mass = 20 J / (0.5 * (2 m/s)^2) = 20 J / (0.5 * 4 m^2/s^2) = 20 J / 2 J = 10 kg

The mass of the sphere is 10 kg.

Type of Energy Possessed by the Sphere

The sphere possesses kinetic energy due to its motion. Kinetic energy is the energy of motion and is given by the formula:

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

In this case, the sphere possesses kinetic energy due to its velocity of 7.2 km/h.

Therefore, the sphere possesses kinetic energy.

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