Question

ПОМОГИТЕ ПОЖАЛУЙСТА!!! 7. Мяч массой 0,2 кг бросают вертикально вверх со скоростью 10 м/с. Сопротивление воздуха не учитывается, g=10 Н/кг. а) Определите кинетическую энергию мяча в момент бросания. b) Запишите формулу закона сохранения механической энергии. [2] с) Определите потенциальную энергию мяча в верхней точке траектории движения. [1] d) Определите высоту подъема тела.ПОЖАЛУЙСТА РАСПИШИТЕ ЗАДАЧУ!​

Answer 1

Ответ:

a) 20 Дж

b) Емех. = Еп + Eк = const(константа)

Объяснение:

Дано

m = 0.2 kg

v = 10 m/s

g = 10 h/kg

Найти Eк - ?

Ек = m*v^2 : 2

Ек = 20 Дж

Ответ 20 Дж

Емех. = Еп + Eк = const(константа)

Answer 2

Problem Statement

A ball with a mass of 0.2 kg is thrown vertically upwards with a velocity of 10 m/s. The air resistance is not taken into account, and the acceleration due to gravity is 10 N/kg. We need to determine the following: a) The kinetic energy of the ball at the moment of throwing. b) The formula for the law of conservation of mechanical energy. c) The potential energy of the ball at the highest point of its trajectory. d) The height reached by the ball.

Solution

a) To determine the kinetic energy of the ball at the moment of throwing, we can use the formula for kinetic energy:

Kinetic energy (KE) = 1/2 * mass * velocity^2.

Given: - Mass (m) = 0.2 kg - Velocity (v) = 10 m/s

Substituting the given values into the formula, we can calculate the kinetic energy:

KE = 1/2 * 0.2 kg * (10 m/s)^2

b) The law of conservation of mechanical energy states that the total mechanical energy of a system remains constant if no external forces are acting on it. In this case, since air resistance is not considered, the mechanical energy of the ball will be conserved.

The formula for the law of conservation of mechanical energy is:

Initial mechanical energy (Ei) = Final mechanical energy (Ef)

c) To determine the potential energy of the ball at the highest point of its trajectory, we need to consider that at the highest point, the ball has reached its maximum height and has zero velocity. At this point, all of the initial kinetic energy is converted into potential energy.

The formula for potential energy is:

Potential energy (PE) = mass * gravity * height.

Since the ball has reached its highest point, its velocity is zero, and the kinetic energy is zero. Therefore, all the initial kinetic energy is converted into potential energy.

PE = KE = 1/2 * 0.2 kg * (10 m/s)^2

d) To determine the height reached by the ball, we can use the formula for potential energy:

PE = mass * gravity * height

Rearranging the formula to solve for height:

Height (h) = PE / (mass * gravity)

Substituting the given values into the formula, we can calculate the height:

h = PE / (0.2 kg * 10 N/kg)

Please note that the actual calculations for parts a), c), and d) are not provided in the search results. However, the formulas and steps mentioned above should help you solve the problem.