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3 years ago

In an exothermic reaction, the energy stored in the reactant is_____ the energy stored in the products.

Physics

1 answer:

docker41 [41]3 years ago

3 0

I believe it is B. Greater than

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Two small particles of mass m1 and mass m2 attract each other with a force that varies inversely with the cube of their separati

Naya [18.7K]

Answer:

$r_{cm}\ =\ \dfrac{m_2d\ +\ m_1v_0 (t_1\ -\ t_0)}{m_1\ +\ m_2}$

Explanation:

Given,

mass of the first particle = $m_1$
velocity of the first particle = $v_o$
mass of the second particle = $m_2$
velocity of the second particle = $v_2 = 0$
Time interval = $(t_1\ -\ t_o)$

Let $v_{cm}$ be the initial velocity of the center of mass of the system of particle at time $t_o$

$\therefore v_{cm}\ =\ \dfrac{m_1v_1\ +\ m_2v_2}{m_1\ +\ m_2}\\\Rightarrow v_{cm}\ =\ \dfrac{m_1v_0}{m_1\ +\ m_2}$

Assuming that the first particle is at origin, distance of the second particle from the origin is 'd'

$x_1\ =\ 0$
$x_2\ =\ d$

Center of mass of the system of particles

$x_{cm}\ =\ \dfrac{m_1x_1\ +\ m_2x_2}{m_1\ +\ m_2}\\\Rightarrow x_{cm}\ =\ \dfrac{m_2d}{m_1\ +\ m_2}\\$

Hence, at time $t_0$ , the center of mass of the system is at $x_0\ =\ \dfrac{m_2d}{m_1\ +\ m_2}$ at an initial speed of $v_{cm}$

Both the particles are assumed to be the point masses, therefore at the time $t_1$ the center of mass is at the position of the second particle which should be equal to the total distance traveled by the first particle because the second particle is at rest.

Let $r_{cm}$ be the distance traveled by the center of mass of the system of particles in the time interval $(t_1\ +\ t_0)$

From the kinematics,

$s\ =\ x_0\ +\ vt\\\Rightarrow r_{cm}\ =\ x_{cm}\ +\ v_{cm}{t_1\ -\ t_0}\\\Rightarrow r_{cm}\ =\ \dfrac{m_2d}{m_1\ +\ m_2}\ +\ \left ( \dfrac{m_1v_0}{m_1\ +\ m_2}\ \right )\times (t_1\ -\ t_0)\\\Rightarow r_{cm}\ =\ \dfrac{m_2d\ +\ m_1v_0 (t_1\ -\ t_0)}{m_1\ +\ m_2}$

Hence, this is the required distance traveled by the first mass to collide with the second mass which is at rest.

5 0

3 years ago

Moving a neutral wire in a(n) ____ field will induce a(n) _____.

frutty [35]

the answer is b) magnetic current

7 0

3 years ago

The net force acting on the ball below is ___ N

yKpoI14uk [10]

The net force applied to the object equals the mass of the object multiplied by the amount of its acceleration." The net force acting on the soccer ball is equal to the mass of the soccer ball multiplied by its change in velocity each second (its acceleration).

8 0

3 years ago

The nucleus of most atoms is composed of which of the following sub-atomic particles?

Blababa [14]

Answer:

protons (+ charge) & neutrons (neutral charge)

however protons has a positive charge so it determined what atom it is.

7 0

3 years ago

A 20 N force is applied to an object causing it to move 10 m. How much work was done on the object? How much energy was needed t

olga2289 [7]

Answer:

Here, force=20N and displacement=10m

Work=Force×Displacement=20N×10m=200Nm

3 0

3 years ago