**Answer:**

Correct answer:

As the temperature increases, the kinetic energy of the molecules increases.

**Explanation:**

The relation between kinetic energy and temperature in an ideal gas which we will take as an example is given by the following formula:

Ek = 3/2 N k T ,

where N is the total number of molecules a k is a Boltzmann constant.

If we assume that the total number of molecules is a constant, kinetic energy only depends on temperature.

God is with you!!!

Hey there!

Each machine preety much have the same type of concept. Let's take for example, a screw. What is a screw? A screw is simply a long/small little "stick" that is able to 'twurl' it's way inside a hole, and hold it's self tight, and also take it's self right back out.

Now, based on the other 5 machines, we can see that it would be very similar of the screw. There would be a in and out function, left to right function, up and down function, and a rounded function, such as a pulley. Those would be the advantages of these different types of machines.

I hope this helps you!

**Answer:**

The box contains a finite number of chocolates making it a closed system since this number does not change.

After taking the box and opening it to eat some chocolates it becomes an open system that can exchange chocolates with the medium

**Explanation:**

In thermodynamics an isolated system is a system in which no heat is exchanged with the medium, a closed system is a system where no particular one is exchanged with the surrounding medium.

In this case, the box can exchange heat since the cardboard walls are not insulating, so it is not an insulated system.

The box contains a finite number of chocolates making it a closed system since this number does not change.

After taking the box and opening it to eat some chocolates it becomes an open system that can exchange chocolates with the medium

**Answer:**

270 m

**Explanation:**

We can find the distance travelled by the car by using the following suvat equation:

where

s is the distance travelled

u is the initial velocity

v is the final velocity

t is the time

For the car in this problem,

u = 0

v = 45 m/s

t = 12 s

Substituting into the equation, we find:

Answer:

Explanation:

Given that,

Frequency of radio signal is

f = 800kHz = 800,000 Hz.

Distance from transmitter

d = 8.5km = 8500m

Electric field amplitude

E = 0.9 V/m

The average energy density can be calculated using

U_E = ½•ϵo•E²

Where ϵo = 8.85 × 10^-12 F/m

Then,

U_E = ½ × 8.85 × 10^-12 × 0.9²

U_E = 3.58 × 10^-12 J/m²

The average electromagnetic energy density is 3.58 × 10^-12 J/m²