Which of the following pictures shows a ray reflecting off a concave mirror?



Select one:
a. A
b. B
c. C
d. D​

Answer:

Depends

Explanation:

If you understand the content rush through questions. If you dont understand learn the key concepts of all the chapters then on the commute tomorrow test your self on the concepts. Good luck!

Answer:

275

Explanation:425- 150 =275mlml=gm

Answer:

14m/s2

Explanation:

initial velocity=2m/s

final velocity =?

time=4s

acceleration=3.0m/s

v=u+at

v=(2)+(3*4)

v=14m/s

by substituting the values in the equation we get the value 14m/s.

Answer:

Hamid

Explanation:

I got it right on my test

Difference in height = 10 - 5 = 5 meters

Kinetic energy = Energy ( 500 N) x height (5 m) = 2,500 N/m  = 2,500 joules

Answer: 2,500 joules

Answer:

Speed = 24 m/s.

No! It doesn't break the speed limit.

Explanation:

The formula we'll be using to find the car's speed:

[tex] \boxed{ \mathsf{speed = \frac{distance}{time} }}[/tex]

The detectors are placed 1.2 m apart.

==> Distance the car travels = 1.2 m

The car, it says, takes 0.050 s to travel that distance.

==> Time taken by the car to travel 1.2 m = 0.050 s

Using the formula mentioned above, let's calculate the speed of the car:

[tex] \sf{speed = \frac{distance}{time} }[/tex]

[tex] \implies \sf{speed = \frac{1.2}{0.050} }[/tex]

On dividing 12 by 0.050 we obtain 24.

[tex] \implies \sf{speed = 24 \: m/s }[/tex]

Any car traveling with a speed that is greater than or equal to 25 m/s is breaking the speed limit.

And since the car in our focus is traveling at 24 m/s that is less than 25 m/s, it doesn't break the speed limit.

Communication is the act of conveying information from one person to another. .'Good communication makes it difficult to express wants and needs.'These statement is not true about good communication.

Communication is the act of conveying information from one location, person, or organization to another. There is a sender, a message, and a recipient for every message.

Communication, while it may appear to be a simple notion, is actually a very complex topic. The message's path from sender to the destination might be influenced by a multitude of circumstances.

Hence the option 'A' is right. 'Good communication makes it difficult to express wants and needs this statement is not true about good communication.

To learn more about communication refer to the link;

https://brainly.com/question/18100115

the answer is A

Explanation : took the quiz on edge 2020

Answer:

v= 4.8 m/s

Explanation:

m= 2.0

KE= 1/2 mv^2

v= ?

v= 1/2 (2.0)^2

v= 4.8 m/s

Given :-

To Find :-

Solution :-

See attachment .

Firstly break the velocity of A , into it's vertical components . That will be ,

[tex] v_A = v_A cos60^o + v_A sin60^o [/tex]

Now the component , [tex]v_A cos60^o [/tex] coincides on side AC and is directed from A to C . Along CA, the velocity of particle C is directed . So both are in opposite directions.

So , the relative velocity of C with respect to A will be ,

[tex] v_{CA}= v_C - v_A [/tex]

Substitute ,

[tex] v_{CA}= v - ( - v cos 60^o) [/tex]

Value of cos 60° is 1/2 ,

[tex] v_{CA}= v + v\bigg(\dfrac{1}{2}\bigg)=v +\dfrac{v}{2}[/tex]

Add the terms,

[tex] v_{CA}= \dfrac{2v + v}{2}=\dfrac{3v}{2}[/tex]

Hence , now we can find the time taken by A and C ,to meet each other will be ,

[tex]s = v t [/tex]

Substitute ,

[tex]d = \dfrac{3v}{2} t [/tex]

Multiplying both sides by 2 ,

[tex] 2d = 3vt [/tex]

Dividing both sides by 3v ,

[tex] t = \dfrac{2d}{3v} [/tex]

Similarly , taking any two particles you will get the same time .

Hence the particles meet after 2d/3v time .

I hope this helps .

Answer:

  never

Explanation:

Particles moving on paths that don't meet at a point will be particles that never meet. Even if the paths meet at a point, which these don't, the particles may not meet if they arrive at different times.

__

Consider the diagrams in the attachments. In order, they show the positions of the particles shortly after takeoff, midway along the line, and after they have gone farther than the length of the line. The point of closest approach is shown in the second attachment, when the particles are halfway along the line.

Consider particles A and C. Their north/south direction is 'north' for each of them. They both have the same velocity in the 'north' direction, but have started at different points, so can never meet. Those two particles have opposite velocities in the east/west direction, so can pass each other (which they do in the second attachment), but cannot meet.

Answer:

1 Unit Electricity is the amount of electrical energy consumed by a load of 1 kW power rating in 1 hour..

Explanation:

By using the orbital period equation we will find that the orbital radius is r = 4.29*10^11 m

This would be the time that a given body does a complete revolution in its orbit.

It can be written as:

[tex]T = \sqrt{\frac{4*\pi ^2*r^3}{G*M} }[/tex]

Where:

Rewriting the equation for the radius we get:

[tex]T = \sqrt{\frac{4*\pi ^2*r^3}{G*M} }\\\\r = \sqrt[3]{ \frac{T^2*G*M}{4*\pi ^2} }[/tex]

Where T = 7.5 years = 7.5*(3.154*10^7 s) = 2.3655*10^8 s

Replacing the values in the equation we get:

[tex]r = \sqrt[3]{ \frac{(2.3655*10^8 s)^2*(6.67*10^{-11} m^3/(kg*s^2))*(1.989*10^{30} kg)}{4*3.14 ^2} } = 4.29*10^{11 }m[/tex]

So the orbital radius is 4.29*10^11 m

If you want to learn more about orbits, you can read:

https://brainly.com/question/11996385

I think its D answer

sorry I dont have explanation but I think its D

Answer: u excited for the super bowl?

Explanation:

Social cognitive theory centers around: A. learning.

Cognitive development can be defined as the development of thought processes, learning skills, knowledge and problem-solving abilities in living organisms such as humans, especially from infancy through adulthood.

Social cognitive theory refers to a theoretical perspective which states that human behavior is typically learned and developed based on interactions with other people and the natural world.

In conclusion, social cognitive theory centers around learning.

Read more on social cognitive theory here: https://brainly.com/question/8893006

Answer:

Both balls have the same downward acceleration (and speed)

Answer:

4.26 m/s

Explanation:

h = 0.925

v = 0

u = ?

v = u^2 - 2gh

0 = u^2 - 2gh

u = sqrt 2gh

= sqrt 2*9.8*0.925

= 4.258

= 4.26

We need to verify the thrid equation of kinematics here

[tex]\\ \tt\longmapsto v^2-u^2=2as[/tex]

[tex]\\ \tt\longmapsto 20^2=2(-8)s[/tex]

[tex]\\ \tt\longmapsto 400=-16s[/tex]

[tex]\\ \tt\longmapsto s=|400/-16|[/tex]

[tex]\\ \tt\longmapsto s=25m[/tex]

The squirrel has a good luck ,Car gets stopped just 1m away from the squirrel .

Explanation:

According to the Question

A squirrel runs out in front of a car moving at +20m/s ( initial speed u) . The driver slams on the brakes and begins decreasing at -8m/s² ( here the acceleration is acting in opposite directions of motion a )

When Squirrel was 26 metres ( Distance from the car initially )

Using Kinematic Equation

On substituting the value we obtain

➥ 0² = 20² + 2 × -8 × s

➥ 0 = 400 - 16 × s

➥ -400 = -16 × s

➥ 400/16 = s

➥ 25 = s

So, the squirrel is 25 metres from the car .

Answer:

C is the correct answer of this question.

Answer:

the world will become different

Answer:

upthrust or BUOYANT FORCE =Vdg

volume=LWH

upthrust=(4cm×5cm×2cm)×1g/cm²×g

upthrust=40cm³×1g/cm³×g

upthrust=40gf or 0.04kg×10m/s²=0.4N

weight of the displaced liquid is upthrust.

so mass=40g or 0.04kg

upthrust=40gf or 0.4Nand mass of the displaced liquid=40g or 0.04kg

please mark brainliest, hope it helped

Answer:

Plane (or) regular surface

Explanation:

A smooth surface is also called as plane surface. (It is like a mirror)

The protostar's surface area was 1.1  times greater.

The surface of the star can be assumed be circular and the surface area can determined as follows;

Area = πr²

[tex]Area = \frac{\pi d^2}{4} \\\\Area = \frac{(100d)^2}{(95d)^2} \\\\[/tex]

Surface area = 1.1 times greater

Thus, the protostar's surface area was 1.1  times greater.

Learn more about protostars here:  https://brainly.com/question/891408

The variable that changes is the period of the motion.

The term simple harmonic motion refers to a regular repeating motion. The acceleration of the SHM is always directed towards the center. The spring is an example of a system undergoing simple harmonic motion.

From the description in the question, the variable that changes is the period of the motion.

Learn more about simple harmonic motion: https://brainly.com/question/17315536

Apply thrid equation of kinematics

[tex]\\ \tt\longmapsto v^2=u^2+2as[/tex]

[tex]\\ \tt\longmapsto v^2=2(5)(1000)[/tex]

[tex]\\ \tt\longmapsto v^2=10000[/tex]

[tex]\\ \tt\longmapsto v=100m/s[/tex]

Answer:

In order to minimize the potential energy, they repel each other (in the case of a positive and negative charge, potential energy is minimized by bringing them together, so they attract).

Explanation:

Hope it helps

Two electrons repel when they interact, because they both have similar negative electric charge.

When the two charges or the charged bodies interact each other, the force of attraction or repulsion acts between them. This force of attraction or repulsion can be find out using the coulombs law.

According to the Coulombs law, the force of attraction of repulsion between charged two bodies is directly proportional to the product of charges of them and inversely proportional to the square of distance between them. It can be given as,

[tex]F=k\dfrac{q_1q_2}{r^2}[/tex]

Here, (k) is the coulombs constant,  (q1 and q2) is the charges of two bodies and (r) is the distance between the two charges.

This force of attraction or repulsion is identified by the sign of the particular charge. According to the property of interacting charges-

As the electrons are negatively charges. Therefore, two electrons repel when they interact, because they both have similar negative electric charge.

earn more about the property of interacting charges here;

https://brainly.com/question/12455287

Answer:

B) 4 m/s²

Explanation:

[tex] \boxed{ \sf{ F= m \times a}}[/tex]

Here,

Substituting the respective values for F and m:

==> 220 = 55 × a

==> 220 = 55 × a

dividing the equation by 55:

==> 4 = a

Therefore, an object of 55 kg when pulled across a frictionless surface by a force of 220 N accelerates at 4 (m/s)/s

I have done before and the answer is c