Question

Скорость тела при прямолинейном равноускоренном движении из состояния покоя увеличилась за 3с до 9м/с. Ускорение тела равно А. 27 м/с2 Б. 3 м/с2 В. 6 м/с2 Массу груза, подвешенного на пружине, уменьшили. При этом период колебания пружинного маятника А. увеличился Б. уменьшился В. не изменился Если при неизменной концентрации молекул идеального газа в 2 раза увеличится скорость движения молекул, то давление в сосуде А. уменьшится в 2 раза Б. увеличится в 2 раза В. увеличится в 4 раза При изохорном процессе, происходящем с постоянной массой газа, не изменяется А. давление Б. объём В. температура Два тела с температурой 20*С и 283 К соответственно привели в соприкосновение. Температура какого тела будет повышаться? А. первого Б. второго В. теплообмена нет Модуль силы взаимодействия между двумя неподвижными точечными заряженными телами равен F. Если увеличить заряд одного тела в 3 раза, а второго – в 2 раза, модуль этой силы станет равен А. 5F Б. F/5; В. 6F; Углом падения называется угол между А. отраженным лучом и падающим; Б. отражающей поверхностью и падающим лучом; В. перпендикуляром и падающим лучом; Г. преломленным лучом и отражающей поверхностью.

Answer 1

Ответ:

1) Б

2) Б

3) В

4) Б

5) Б

6) В

7) В

Answer 2

Speed and Acceleration

The speed of an object in uniformly accelerated motion can be calculated using the equation: \[v = u + at\] where \(v\) is the final velocity, \(u\) is the initial velocity, \(a\) is the acceleration, and \(t\) is the time taken.

Given that the initial speed \(u = 0\), the final speed \(v = 9 \, \text{m/s}\), and the time \(t = 3 \, \text{s}\), we can calculate the acceleration using the above equation.

Using the equation \(v = u + at\), we can rearrange it to solve for acceleration: \[a = \frac{v - u}{t}\]

Substituting the given values: \[a = \frac{9 \, \text{m/s} - 0}{3 \, \text{s}} = 3 \, \text{m/s}^2\]

Therefore, the acceleration of the object is 3 m/s^2. [[3 #1]]

Period of Oscillation

When the mass of a spring-mass system is decreased, the period of oscillation increases. This relationship is described by Hooke's Law, which states that the period of oscillation is inversely proportional to the square root of the mass.

Therefore, when the mass is decreased, the period of oscillation increases. [[6 #1]]

Ideal Gas and Pressure

According to the ideal gas law, the pressure of an ideal gas is directly proportional to the average kinetic energy of the gas molecules. If the speed of the gas molecules is doubled while the concentration (number of molecules) remains constant, the average kinetic energy and hence the pressure will increase.

Therefore, if the speed of the gas molecules is doubled, the pressure in the vessel will increase by a factor of 4. [[9 #1]]

Isochoric Process

In an isochoric process (constant volume process), the volume of the gas does not change. Therefore, in such a process, the volume remains constant. [[4 #1]]

Heat Transfer

When two bodies at different temperatures are brought into contact, heat transfer occurs from the body at higher temperature to the body at lower temperature until thermal equilibrium is reached. In this case, the temperature of the body initially at 20°C will increase, while the temperature of the body initially at 283 K will decrease until they reach the same temperature. Therefore, the temperature of the first body will increase. [[7 #1]]

Coulomb's Law and Force

Coulomb's law states that the force between two point charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between their centers.

If the charge of one body is increased by 3 times and the charge of the other body is increased by 2 times, the force between them will be: \[F' = k \cdot \frac{(3q) \cdot (2q)}{r^2} = 6k \cdot \frac{q^2}{r^2}\]

This shows that the force will become 6 times the original force. Therefore, the new force will be 6F. [[1 #1]]

Angle of Incidence

The angle of incidence is the angle between the incident ray and the normal to the surface at the point of incidence. Therefore, the angle of incidence is the angle between the incident ray and the normal to the surface at the point of incidence. [[10 #1]]