<h2>

**Answer: The drag force goes up by a factor of 4**</h2>

**Explanation:**

The Drag Force equation is:

** (1)**

Where:

is the **Drag Force**

is the **Drag coefficient**, which depends on the material

is the **density of the fluid** where the bicycle is moving (air in this case)

is the **transversal area** of the body or object

the bicycle's **velocity**

Now, if we assume , and do not channge, we can rewrite **(1)** as:

** (2)**

Where ** ** groups all these coefficients.

So, if we have a new velocity , which is the double of the former velocity:

**(3)**

Equation** (2)** is written as:

**(4)**

Comparing **(2)** and **(4)** we can conclude the **Drag force is four times greater when the speed is doubled.**

**Answer:**

t = 3 minutes

**Explanation:**

Given that,

Power of fan, P = 50 W

Energy used, E = 1 kWh

We know that,

Energy = Power/time

As, 50 watts = 0.05 kilowatts

So,

or

t = 3 min

**So, the required time is equal to 3 minutes.**

The elephant and the mouse having zero weight in a gravity free space **will not bump into you at the same effect.
**

**<u>Explanation:
</u>**

When **both are in a gravity free space, the weights are zero**, as we know that the

But when they will acquire the speed of same magnitude, say v, their **different masses will acquire different momentum**, which will make the **difference in effect while bumping. **

And as we know Therefore, **effect of impact by elephant will be more than that of mouse
. **An **elephant breaking into you will take you back faster than a mouse in space hits you.
**

**Answer:**

Juan and Kuri complete one revolution in the same time, but Juan travels a shorter distance and has a lower speed.

**Explanation:**

Since Juan is closer to the center and Kuri is away from the center so we can say that Juan will move smaller distance in one complete revolution

As we know that the distance moved in one revolution is given as

also the time period of revolution for both will remain same as they move with the time period of carousel

Now we can say that the speed is given as

so Juan will have less tangential speed. so correct answer will be

Juan and Kuri complete one revolution in the same time, but Juan travels a shorter distance and has a lower speed.

Yes. that is **"True"**.

All instruments have limited exactness, so the capacity to determine little contrasts in measurement is subsequently restricted.

Precision alludes to the closeness of at least two estimations to one another. For example, on the off chance that you gauge a given substance five times, and get 3.2 kg each time, at that point your estimation is precise. You can be extremely precise yet mistaken. You can likewise be exact yet not precise.