**Explanation:**

**We assume kinetic and potential energy changes are negligible and there is no work interactions.**

**a) Taking tank as a system, The energy balance can be define as **

**The mass balance could be written as **

**The final pressure in the tank could be defined as following**

**from standard steam table we know at **

**b)**

**From steam table at **

**initial mass in the tank could be define as **

**Final mass in the tank could be define as**

**The amount of steam that has entered the tank **

**c)**

**The internal energy in final state could be defined as following**

**The heat transfer could be defined as following**

The **velocity **of the mass at time, t = 1 s, is determined as **20 m/s.**

<h3>

**Magnitude of the force experienced by the body**</h3>

The **magnitude **of the **force **experienced by the body is calculated as follows;

|F| = √(8² + 6²)

|F| = 10 N

<h3>Acceleration of the mass</h3>

From Newton's second law of motion;

F = ma

where;

- m is mass
- a is acceleration

a = F/m

a = 10 /0.5

a = 20 m/s²

<h3>Velocity of the mass after 1 second</h3>

v = at

v = 20 x 1

v = 20 m/s

Learn more about **velocity **here: brainly.com/question/6504879

#SPJ1

You will have to use this formula:

Final Velocity (V) = 4m/s

Initial Velocity (Vo) = 8m/s

Acceleration (a) = ? m/s^2

Time (t) = 2 secs

Then:

-> 4 = 8 + a x 2

-> 4 - 8 = 2a

-> -4 = 2a

-> a = -4/2

-> a = -2 m/s^2

Ps: It's value is negative because the she was in retrograde motion.

Answer: Her acceleration is -2 m/s^2.

**Answer:**

**it is reduced four times.**

**Explanation:**

By definition, the electric field is the force per unit charge created by a charge distribution.

If the charge creating the field is a point charge, the force exerted by it on a test charge, must obey Coulomb´s Law, so, it must be inversely proportional to the square of the distance between the charges.

So, if the distance increases twice, as the force is inversely proportional to the square of the distance, and the square of 2 is 4, this means that the magnitude of the force exerted on the test charge must be 4 times smaller.