If the angle of incidence is 30°, what is the value of the
angle of reflection?

Please help!!! Respond ASAP please

Answer:

please mark brainlist

Explanation:

Initial speed   u=80 km/h=80×185=22.22 m/s

Final speed    v=60 km/h=60×185=16.67 m/s

Using   v=u+at

Or   16.67=22.22+α×5

⟹ a=−1.1 m/s2

Explanation:

Gravitational force

The force of gravity is the force with which the earth, moon, or other massively large object attracts another object towards itself.

Normal force

The normal force is the support force exerted upon an object that is in contact with another stable object.

Friction force

The friction force is the force exerted by a surface as an object moves across it or makes an effort to move across it.

Tension force

The tension force is the force that is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends.

Spring force

The spring force is the force exerted by a compressed or stretched spring upon any object that is attached to it.

answer- 2.3

km/hr 120/1 276/h 276/2.3

Answer:

W 1920 N

Explanation:

200kg at a location where g=9.6m/s^2

Answer:

15km

Explanation:

7 1/2 pluse (im new but know a alot of math)7 1/2 equals 15km

Answer:

gravity

Explanation:

the Forest of gravity causes objects to fall toward the center of the Earth.

Answer:

due to gravitational force.

Answer:

c

Explanation:

let's assume that you are splitting the piece of wood horizontally. This would not change the density of the wood at all, only the length. I rest my case. Ur awesome and have an amazing day.

Answer: A (smooth)

Thanks for using Brainly! You or your parents Vote Biden 2020.

Hope we influence your vote!

Answer:

tcar 1 = tcar 2< tcar 3

Explanation:

khan academy

Initial launch speed of the cars are in order as  Vcar 1 = Vcar 2< Vcar 3

The speed of any moving object is the ratio of the distance covered and the time taken to cover that distance.

Toy cars 1, 2 and 3 are launched horizontally with the trajectories shown below. Cars 1 and 2 are launched from a 15 m high cliff, while Car 3 is launched from a 30m high cliff. We can ignore air friction.

The velocity of the toy car 1 and 2 is

V1/2 = √2gh

Put the values, we get

V 1/2= √(2x 9.81x 15)

V1/2 = 17.16 m/s

The velocity of the toy car3 is

V3 = √2gh

Put the values, we get

V3 = √(2x 9.81x 30)

V3 = 24.26 m/s

Thus,  Vcar 1 = Vcar 2 < Vcar 3

Learn more about speed.

brainly.com/question/7359669

#SPJ2

Answer:

B. The ball will move with a constant speed.

Explanation:

Assuming a ball is traveling through space at a velocity of 25 m/s. The statement which best describes the motion of this moving ball if there is no external force applied to the ball is that, the ball will move with a constant speed in accordance with Newton's first law of motion.

Newton's first law of motion states that, an object or body will continue to be at rest or experience a uniform motion in a straight line at constant speed provided there's no action of an external force. Thus, unless compelled to change its state by an external force, a body will continue to be at rest or experience a uniform motion in a straight line.

The Newton's first law of motion is also known as the law of inertia; which is the tendency of a body to be at rest unless acted upon by an external force.

Answer:

C book sitting on a shelf.

Explanation:

An object can store energy as the result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position

plz mark brainliest

Answer:

the velocity is like 17 or something ion even know

Explanation:

Answer:

R = 85.73 m

Explanation:

It is given that,

The vertical speed of a rock, [tex]v_y=35\ m/s[/tex]

The horizontal speed of a rock, [tex]v_x=12\ m/s[/tex]

We know that,

The vertical speed,

[tex]v_y=v\sin\theta=35\ ....(1)[/tex]

Horizontal speed,

[tex]v_x=v\cos\theta=12\ ....(2)[/tex]

Dividing equation (1) by (2) such that,

[tex]\dfrac{v_y}{v_x}=\dfrac{v\sin\theta}{v\cos\theta}\\\\\dfrac{35}{12}=\tan \theta\\\\\theta=\tan^{-1}(\dfrac{35}{12})\\\\\theta=71.07^{\circ}[/tex]

Let v is the initial velocity of the projection. So,

[tex]v=\sqrt{v_x^2+v_y^2} \\\\v=\sqrt{12^2+35^2} \\\\v=37\ m/s[/tex]

We need to find the distance where it will land i.e. the range of the projectile. It is given by the formula as follows :

[tex]R=\dfrac{v^2\sin2\theta}{g}\\\\\text{Putting all the values, we get }\\\\R=\dfrac{37^2\times \sin(2\times 71.07)}{9.8}\\\\R=85.73\ m[/tex]

So, it will land at a distance of 85.73 m.

Answer:

D

Explanation:

The student had displaced their in the class when she left. The phone is what's displaced and student leaving equals distance.

Explanation:

improved saftey for children

Answer:

D. Improved safety for children

Explanation:

Answer:

The hypothesis as to what happened to the soda and the air in the can are as follows;

The solubility of air in the soda is high at low temperatures, such that air (carbon dioxide, CO₂) is trapped in the soda and when it is drank, it gives it its fresh taste

By placing the can of soda on the hot plate, drives off the air in the soda such that the space directly above the liquid soda is filled with the original air (carbon dioxide), in the soda

By dipping the soda upside down in the sink half filled with water, the soda is cooled down and the air (carbon dioxide) directly above the surface of the liquid soda is reabsorbed into the liquid soda, such that if the lid of the soda is sealed, the vacuum created by the empty space directly above the liquid soda becomes a region of low pressure and the combined pressure from the atmosphere and the liquid level in the sink, causes the can to immediately crushed (deformed).

Explanation:

Answer:

2×3×3×3 = 54

So yea this is ur answer

Answer: yayyyyyyyyyyyy

Explanation: i hope nobody get coronavirus at school that would be terrible

hope it fun!

Answer:

Nice! Remember to always stay 6ft away from everyone!

Explanation:

:]

The best physical property to focus on for the first step in separating the mixture would be magnetism, therefore the correct answer would be option C.

An area where the magnetic force is being applied might be described as a magnetic field. This area could be found around a magnet, magnetic substance, or electric charge.

The magnet's N-pole and S-pole have the strongest magnetic fields for a basic bar magnet. A magnet's north pole serves as the source of the magnetic field, which ends at the south pole.

As given in the problem Katie's teacher has given her a sample that contains a mixture of salt, sand, and iron fillings. She is instructed to separate the mixture into three individual components.

The first step in separating the mixture would be to separate iron fillings with the help of the property of magnetism as iron fillings are the magnetic material. therefore the correct answer would be option C.

Learn more about the magnetic fields from here

brainly.com/question/23096032

#SPJ6

Answer: When an object falls, its gravitational potential energy is changed to kinetic energy. You can use this relationship to calculate the speed of the object's descent.

Answer:

water filtration

Explanation:

In the case of a mixture of sand and water filtration can used to separate the two. This requires a sieve that does not allow any of the particles of sand to pass through.

Answer:

Become leaders, represented.

Explanation:

bc

Answer:

8.42s

Explanation:

The time (in seconds) needed to move the car can be calculated using the formula:

S = ut + 1/2at²

Where; S = distance (m) = 5m

u = initial velocity (m/s)

a = acceleration (m/s²)

t = time (s)

However, the acceleration (a) can be got by using F = ma

Where; F = force = 187 N

m = mass = 1330 kg

F = ma

a = F/m

a = 187/1330

a = 0.1406

a = 0.141m/s²

Since a= 0.141m/s², S = 5m, t =

S = ut + 1/2at²

5 = (0 × t) + 1/2 × (0.141 × t²)

5 = 0 + 0.141t²/2

5 = 0.141t²/2

10 = 0.141t²

t² = 10/0.141

t² = 70.922

t = √70.922

t = 8.42s