ფიზიკაში მჭირდება დახმარება ნაგლმა მასწავლებელმა მთელი თვე გააცდინა და როცა დაბრუნდა ეგრევე საკონტროლო ისეთი საკითხებით რომელიც არც კი განგვიხილია ​

Answer :

Answer: [tex](a)10.812\ m/s\ (b)\ 0.75\ m/s\ \text{left}[/tex]

Explanation:

Given

Mass of hockey puck [tex]m=0.160\ kg[/tex]

Initial velocity of hockey puck is [tex]u=3\ m/s[/tex]

First a horizontal force of [tex]25\ N[/tex] is applied to the right for [tex]0.05\ s[/tex]

acceleration associated with it is

[tex]\Rightarrow a=\dfrac{25}{0.160}\\\\\Rightarrow a=156.5\ m/s^2[/tex]

Using equation of motion i.e.

[tex]\Rightarrow v=u+at\\\Rightarrow v=3+156.25\times 0.05\\\Rightarrow v=3+7.812\\\Rightarrow v=10.812\ m/s[/tex]

(b) When a force of [tex]12\ N[/tex] is applied for 0.05s

Using equation of motion i.e.

[tex]\Rightarrow v=3-\dfrac{12}{0.160}\times 0.05\\\\\Rightarrow v=3-75\times 0.05\\\Rightarrow v=3-3.75\\\Rightarrow v=-0.75\ m/s\\\Rightarrow v=0.75\ \text{towards left}[/tex]

Answer:

my only true question is b

Answer:The true statements about generators would be :

They convert motion energy to electric energy

           They use the relative motion of a magnet and a coil of wire.

Explanation:

Generators use the energy of the rotating coil in relative motion with magnets to induce a current within the wire. Generators are devices that convert energy into a voltage by the relative motion of the magnet and a coil that changes flux.

Answer:

Acceleration, a = -0.5 m/s²

Explanation:

Given the following data;

Initial velocity = 72 km/h

Final velocity = 18 km/h

Time = 10 seconds

To find the acceleration of the car;

Conversion:

72 km/h to m/s = 72*1000/3600 = 20m/s

18 km/h to m/s = 18*1000/3600 = 5 m/s

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

[tex]Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}[/tex]

Substituting into the equation;

[tex]a = \frac{5 - 20}{10}[/tex]

[tex]a = \frac{-5}{10}[/tex]

Acceleration, a = -0.5 m/s²

Therefore, the car is decelerating.

Answer: 2.0

Explanation: I KNOW !

Answer:

When displacement is zero, the particle may be at rest, therefore, distance travelled = 0.

Again, when displacement is zero, the final position matches with the initial position after some time, but the distance travelled will not be zero.

Answer:

what a fat bear I love physics

Answer:

Spring constant, k = 8740.89 N/m

Explanation:

Given the following data;

Potential energy = 4.2 J

Extension, e = 3.1 cm to meters = 3.1/100 = 0.031 m

To find the spring constant;

Mathematically, the potential energy stored in a spring is given by the formula;

[tex] P.E = \frac {1}{2}Kx^{2} [/tex]

Where;

P.E is potential energy.

K is the spring constant.

x is the extension of the spring.

Substituting into the equation, we have;

[tex] 4.2 = \frac {1}{2}*k*0.031^{2} [/tex]

Cross-multiplying, we have;

[tex] 8.4 = k*0.000961 [/tex]

[tex] k = \frac {8.4}{0.000961} [/tex]

Spring constant, k = 8740.89 N/m

Answer:

[tex]\theta_i = 23^o[/tex]

Explanation:

The refractive index of a medium is given by the following formula:

[tex]\eta = \frac{Sin\theta_i}{Sin\theta_r}[/tex]

where,

η = refractive index = 1.5

[tex]\theta_i[/tex] = angle of incidence = ?

[tex]\theta_r[/tex] = angle of refraction = 15°

Therefore,

[tex]1.5 = \frac{Sin\theta_i}{Sin15^o}\\\\Sin\theta_i=(1.5)Sin15^o\\\\\theta_i = Sin^{-1}(0.388)\\\\[/tex]

[tex]\theta_i = 23^o[/tex]

Answer:

D. Dylan is incorrect because a 90-degree launch angle results in the largest vertical range​

Explanation:

Projectile is the motion of an object thrown into space. When an object is thrown into space, the only force which acts on it is the acceleration due to gravity.

An object thrown into space would reach maximum height (vertical range) if it is launched at an angle of 90 degrees. For maximum horizontal range, the object needs to be launched at an angle of 45 degrees.

Therefore Dylan is incorrect because a 90-degree launch angle results in the largest vertical range​

The correct statement is

D. Dylan is incorrect because a 90-degree launch angle results in the largest vertical range​

It is the object motion that should be thrown into space. At the time when the object is thrown into space, the only force that should act on it represent the acceleration because of gravity.

Since object thrown into space should have to reach maximum height in the case when it is launched the 90 degrees angle. Due to the above reasons, option D is considered.

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Answer:

Explanation:

Answer:

d

Explanation:

atoms exits everywhere

Answer: The correct choices to this question are, "B. Atoms are smaller than quarks," and "D. Atoms only exist on earth." Hope this helped.

Answer:(of a reaction or process) accompanied by the release of heat.

Explanation: trust moi

Answer:

43.4 N (newton)

Answer:

the amount of energy needed to raise the temperature of the iron is 90 J.

Explanation:

Given;

mass of the iron, m = 2 g

initial temperature, t₁ = 20⁰ C

final temperature, t₂ = 120⁰ C

specific heat capacity of iron, c = 0.45 J/g⁰C

The amount of energy needed to raise the temperature of the iron is calculated as follows;

H = mcΔt

H = mc(t₂ - t₁)

H = 2 x 0.45 x (120 - 20)

H = 90 J

Therefore, the amount of energy needed to raise the temperature of the iron is 90 J.

Answer:

law

Explanation:

A law is a scientific statement that describes a proven fact about how things function in nature

Answer:

Selenium is a semiconductor

Explanation:

Selenium is a semiconductor.

Elements in the column IV and VI of the periodic table are referred to as Semiconductor.

Selenium lies in the column VI along with Tellurium

Some other elements of the column IV are silicon, germanium, and tin

Answer:

semiconductor

Explanation:

Explanation:

1. Given,

Diameter of the round pan = 8in

Radius of the round pan = 8/2 = 4in

Height of the round pan = 2in

Therefore,

Volume of the round pan

[tex]\pi {r}^{2} h[/tex]

[tex] = 3.14 \times 4in \times 4in \times 2in[/tex]

[tex] = 100.48 {in}^{3} [/tex]

When rounded to nearest tenth,

[tex] = 100.5 {in}^{3} (ans)[/tex]

2. Given,

Dimensions of the rectangular pan = 12in, 8in, 2in

Therefore,

Volume of the rectangular pan = breadth × height × length

= 12in × 8in × 2in

[tex] = 192 {in}^{3} [/tex]

When rounded to nearest tenth,

[tex] = 192.00 {in}^{3} [/tex]

[tex] = 192.0 \: or \: 192 {in}^{3} [/tex]

3. Volume of round pan

[tex] = {100.5in}^{3} [/tex]

Volume of Rectangular pan

[tex] = 192 {in}^{3} [/tex]

Hence,

Their difference of volume will be ,

[tex] = (192 - 100.5) {in}^{3} [/tex]

[tex] = 91.5 {in}^{3} (ans)[/tex]

4. In this case we must know either the mass of the cake or its volume.

Given the case that we know the mass of the cake, it would be:

price = x * 0.2

where x is the mass of the cake in ounces, that is to say if for example a cake has a mass of 10 ounces, it would be:

price = 10 * 0.2 = 2

which means that each cake costs $ 2

Given the case of the volume, we must first multiply the density by this volume in order to calculate the mass and finally the price.

price = x * 0.454 * 0.2

where x is the volume of the cake in cubic inches, if for example the volume is 10 cubic inches it would be:

price = 10 * 0.454 * 0.2 = 0.908

which means that each cake costs $ 0.9

I don't see any free body diagrams.

Free body diagram of a moon orbits a planet in a nearly circular orbit of radius R, as shown in the figure is attached in the answer. This could be used to analyze the forces exerted on the moon when it is at the position indicated in the figure.

Free-body diagrams are used to display the relative strength and direction of all forces that are being applied to an item in a certain scenario. A unique illustration of the vector diagrams that were covered in a previous lesson is the free-body diagram. We will make use of these graphics throughout our study of physics. In a free-body diagram, the size of the arrow indicates the strength of the force.

The force is acting in the direction indicated by the arrow's direction. The exact type of force is labelled next to each force arrow in the diagram. In a free-body diagram, it is common practice to depict the item as a box and to draw the force arrow from the box's center outward in the direction that the force is acting.

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Answer:

E

Explanation:

Answer:

Explanation:

Eustachian tube is located in between the middle ear and the nasopharynx.It's function is to control the pressure within the middle making it equal to the air pressure outside the body.

Answer:

Explanation:

[tex]KE=\frac{1}{2}mv^2[/tex] and we are solving for KE:

[tex]KE=\frac{1}{2}(20)(8)^2[/tex] which gives us that

KE = 640 J, choice C.

Answer:

force

Explanation:

Force is a push or a pull of an object that causes the object to speed up, slow down, or stay in one place. In other words, a force is what causes an object to move. Friction and gravity are two types of forces that influence how an object moves.

Answer:

I dont know hehe

Explanation:

Sakit na ulo ko.

Answer:

Explanation:

According to the laws of reflection,

→ Angle of reflection : Angle of which light rays reflect off surface.

→ Angle of incidence : Angle at which light rays strikes the surface.

Answer: reflection

Explanation:

Answer:

Explanation:

Now

Look at it this way. This box is in equilibrium... Meaning forces around balanced out.

Now...

The Earth's pull on it is 98N

What Minimum external forces is needed to pick this up....

Now... The Minimum Force is 98N

Why?

Since This Box is under the influence of gravity...

Gravity is acting as a resistance

If you apply a force less than 98N... Let's say 50N on this box... It won't budge because your applied force is less than the resisting force on it(98N).

So We need a force ≥98. So the least force is 98N. Nothing below this will move the Box

Answer 98N.

Answer:

See image

Explanation:

Plato

Answer:

120v 120v 120v 120v 120v

Answer:

E.) Sound Waves are an example of longitudinal waves.

Explanation:

I was sure either A or E was correct so I had to look it up. In reference to three sources, it is proven that sound waves are longitudinal. Therefore, without a doubt, I would try to go with E. I know D is wrong as well as B most definitely. That is because sound always requires a medium to travel through in order to be heard; additionally sounds don't necessarily have to be a certain rate of loudness in order to be considered of different quality. Therefore leaving you with A, C, or E. Additionally C is a false fact as well. So I highly suggest choosing E because there is sufficient sources to prove that. I'll provide a direct link down below.

https://www.bing.com/search?q=are+sound+waves+longitudinal+waves&cvid=fc17d9f3f744496da334cf10a7daad57&aqs=edge..69i57l2j69i60j5j69i61j69i60l2.5395j0j1&pglt=2339&FORM=ANNTA1&PC=NMTS

The correct statement is sound waves are an example of longitudinal waves.

In a longitudinal wave, the particles are displaced parallel to the direction the wave travels. An example of longitudinal waves is compressions moving along a slinky. We can make a horizontal longitudinal wave by pushing and pulling the slinky horizontally.

Sound is a longitudinal wave that alternately compresses and decompresses the component particles of the medium through which it travels.

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