The question involves the knowledge of kinematics and dynamics. The answers are;

a) **Time** taken to stop the car = 10 s

b) The operation that slows the car is **Friction**

c) The size of the **force** = 1200 N

<h3>

**What is Deceleration ?**</h3>

Deceleration is the opposite of **acceleration**. When an object is going to rest, it will be decelerating and the final **velocity** will be equal to zero.

Given that the driver of a car moving at 15 m/s along a straight level road applies the brakes. The car decelerates at a steady rate of 3/2 m/s²

a) How long does the car take to stop can be found by using the formula

v = u - at

Where

Substitute all the **parameters** into the formula

0 = 15 - 1.5t

1.5t = 15

t = 15/1.5

t = 10 s

b) The description of the operation that slows the car down after the brake pedal is pressed is simply **friction**.

c) If the mass of the car is 800. The size of the **force** slowing the car down will be F = ma

F = 800 × 1.5

F = 1200 N

Therefore, the **time** taken to stop the car is 10 s and the **force** slowing the car down is 1200 N

Learn more about **Acceleration** here: brainly.com/question/605631

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**Answer:**

**Explanation:**

v = Velocity of the elevator = 3.1 m/s

= Angle of the slope =

Vertical component is given by

**The vertical component of the velocity is .**

Horizontal component is given by

**The horizontal component of the velocity is .**

<span>The statement, Quantities must
have different units before they can be added or subtracted, is false. <span>You need to note when you add or subtract units, they
must be first homogenous or the same. In conversion factors, always check for
the units. Suppose that you are given the area of a certain house which is
164m2. You are asked to find it in square feet. You will need to multiply
0.305m by itself to get m2. You have (0.305m)^2 is equal to 0.093025ft2. Now
you have an equivalent factor of 1ft2 is equal to 0.093025ft2. After that,
divide 164m2 by 0.093025ft2 and you will get 1762.97ft2. </span></span>

**Answer:**

Negative z-direction

**Explanation:**

First of all, we need to understand the direction of the magnetic force on the proton. This can be determined by using the right hand rule. So we have:

- index finger: direction of the proton, positive x-direction

- middle finger: direction of magnetic field, positive y-direction

- thumb: direction of the force, positive z-direction

In order to balance this magnetic force, the electric force must act in the opposite direction (negative z direction). Since for a proton (positive charge) the force and the electric field have same direction, it means that the electric field must also be in the negative z direction.

1. Communication

In early ages people were using letters to communicate between them. Now days instantly we can call one person from anywhere, these are based on optical fiber communication and it is an application of physics.

2. Transportation

We can travel from place to anther place by aeroplane , these technologies are introduced after advancement in physics.

3. Construction

Earlier people used to stay in small houses, now days apartments with many number of storeys are built by considering all the forces coming on the structure.

4. Medical Department

The invention of many equipment increased the health of humans.

5. Weather forecasting

The prediction of weather considering all the available factors, prediction of natural disasters all are application of physics.