Define principal focus of concave mirror.Where should we place a candle in front of a concave mirror to get an enlarged,erect image?

Answer:

Long jewelry

Explanation:

Answer: pull,aim,squeeze,spread

Explanation:

Answer:

The steel needle floats on top of the water because of surface tension. Surface tension happens because the water molecules at the surface of the water are strongly attracted to each other more than they are to the air molecules above them. The water molecules make an invisible skin on the water’s surface that allows things like the needle to float on top of the water.

When soap is added to the water, the water molecules aren't drawn together as strongly. The soap molecules combine with the water molecules and lessen the liquid’s surface tension. The new attractions between the air, water, and soap molecules are weaker than the water-to-water attractions. As a result, the liquid’s surface is no longer strong enough to support the weight of the steel needle and the steel needle sinks.

Answer:

when a Steel Blade is placed on water horizontally just surface tension and the buoyancy will be able to balance the weight of the blade and it will float on the water surface you know the boy and she is not sufficient to make the Steel Blade float now if you are detergent what are the surface tension of water immediately decreases the surface tension no longer be able to balance The Blade and it will sink

hope it helps u

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Answer:

13.5 m

Explanation:

Given:

v₀ = 0 m/s

v = 9 m/s

a = 3 m/s²

Find: Δx

v² = v₀² + 2aΔx

(9 m/s)² = (0 m/s)² + 2 (3 m/s²) Δx

Δx = 13.5 m

Answer:

d.

Explanation:

graphs visually show the relationship between the variables under investigation. Table of data shows the quantitative analysis while the graph shows the relationship between y-axis and x-axis. Both of them are important.

Answer:

Esses movimentos são movimentos naturais.

Explicação:

Se uma pedra cair do topo de um telhado ou edifício, a pedra se moverá em direção à terra, enquanto a fumaça produzida devido à queima da madeira vai para cima, então de acordo com Aristosteles esses tipos de movimento são chamados de movimento natural porque de acordo à definição de movimento natural que não requer nenhuma força, então esses dois movimentos também se movem na direção para baixo e para cima sem usar qualquer força, então podemos dizer que esses movimentos são naturais.

Answer:

t = 200 nm

Explanation:

It is given that,

Wavelength of a light beam is 500 nm

It is reflected constructively from a thin layer of oil having index of refraction 1.25.

The oil floats on the top of water of index of refraction 1.33.

We need to find the minimum thickness of the layer of oil. `

For constructive interference,

[tex]\dfrac{2nt}{\lambda}=m[/tex]

m is 1 for minimum thickness

n is refractive index of oil

t is thickness of layer of oil.

So,

[tex]t=\dfrac{m\lambda}{2n}\\\\t=\dfrac{1\times 500\times 10^{-9}}{2\times 1.25}\\\\t=2\times 10^{-7}\ m\\\\t=200\ nm[/tex]

So, the minimum thickness of the layer of oil is 200 nm.

Prove that v² = u² + 2as .

From first equation of motion,

v = u + at

=> at = v - u

=> t = v - u / a

From the second equation of motion, we have

s = ut + 1/2at²

Putting the value of t in above equation , we get:

s = u ( v - u /a ) + 1/2 a ( v - u/a )²

s = uv - u² / a + a( v² + u² - 2uv / 2a²)

s = uv - u² / a + v² + u² - 2uv / 2a

s = 2uv - 2u² + v² + u² - 2uv / 2a

2as = v² - u²

Answer:

[tex] \boxed{ \boxed{ \orange{ \sf{see \: below}}}} [/tex]

Explanation:

[tex] { \underline{ \underline \bold{ \sf{ \blue{ {question \: }}}}}}[/tex]

[tex] \sf{ \bold{ \underline{ \: prove \: that \: {v}^{2} = {u}^{2} + 2as}}}[/tex]

[tex] \underline{ \underline{ { \bold{ \sf{ \purple{solution} }}}}}[/tex]

Let us assume a body moving with an initial velocity ' u '. Let it's final velocity be 'v' after a time 't' and the distance travelled by the body be 's'. We already have ,

[tex] \sf{v = u + at}[/tex] ⇒first equation of motion ( i )

[tex] \sf{s = \frac{u + v}{2} \times t}[/tex] ⇒second equation of motion ( ii )

Putting the value of t from ( i ) in the equation ( ii )

{ v = u + at

or , at = v - u

or, t = v-u / a }

[tex] \sf{s = \frac{u + v}{2} \times \frac{v - u}{a} }[/tex]

[tex] \sf{or \: s = \frac{ {v}^{2} - {u}^{2} }{2a} }[/tex]

[tex] \sf{or \: 2as = {v}^{2} - {u}^{2} }[/tex]

[tex] \sf{ \boxed{ \bold{ \:  ∴ \: \: \: {v}^{2} = {u}^{2} + 2as}}}[/tex] ⇒ forth equation of motion

Hope I helped!

Best regards!!

Formula: s = d/t

s = speed

d = distance

t = time

Solve using the values we were given.

s = 125/2

S = 62.5km per hour

Best of Luck!

Answer:

16m E

Explanation:

displacement=10m E-6m W+12m E=16m E

Explanation:

A micrometer is a measuring device or an instrument which is used to measure very minute measurements very accurately and precisely. It is mathematical tool used to provide accurate measurement for any mechanical components.

Now, if the micrometer that I have found is badly bent, it would provide faulty or wrong measurements both in terms of  precision and accuracy when compared to a high quality meter stick.

Answer:

temperature and relative motion

Explanation:

Well you never specified what you're asking... however, this might help you learn the concepts of displacements and magnitude.

:  The official displacement formula is as follows: s = sf - si. s = displacement; si = initial position; sf = final position

magnitude is the quantitative value of seismic energy. It is a specific value having no relation with distance and direction of the epicentre.

the magnitude of a vector in any dimension. For a 2d vector the formula is [math]|z| = \sqrt{x^2+y^2}[/math], where x and y are the x and y components of the vector respectively.

Answer:

Distance= 84 meters

Displacement= 20 meters

Direction= West

Explanation:

The starting position we know is 10 meters eastward and the final position is 18 meters westward. Remember the equation for displacement is Delta=final position minus the initial position. So its 18-10=8. The next equation that we would have to solve would be 22-8, because our starting position is 8 meters and our final position is 22, so final minus the initial remember. Then 22-8=14. Finally the last equation we would have to solve would be 34-12, again our initial position is 12 meters and our final position is 34 meters, therefore the answer to 34-14=20. So we end up with our displacement as 20 meters and don't forget to include the direction, which is West.

Explanation:

The units of pressure is called derived units because it is simply derived from base unit which is distance and a derived unit which is force, which is derived from acceleration, a derived unit as well, and mass, a base unit. As we all know, work is defined as the force x distance. Thus making work a derived unit.

Answer:

[tex]60\; \rm m[/tex].

Explanation:

Refer to the velocity-time diagram attached. The displacement of an object over a period of time is equal to the area of the region between the velocity-time plot and the horizontal time axis. That is the case even if the velocity of the object is changing over time.

For the car in this question, the distance travelled in that two seconds should be equal to the trapezoid highlighted in green. That's the region bounded with:

The formula for the area of a trapezoid is:

[tex]\displaystyle \text{Trapezoid Area} = \frac{1}{2}\times \text{Height} \times (\text{Upper Base} + \text{Lower base})[/tex].

For the imaginary trapezoid on this velocity-time graph:

Therefore:

[tex]\begin{aligned}&\text{Displacement} \\ &= \text{Area of the imaginary trapezoid}\\ &= \frac{1}{2} \times 2\; \rm s \times \left(10\; \rm m \cdot s^{-1} + 50\; \rm m \cdot s^{-1}\right)\\ &= 60\; \rm m\end{aligned}[/tex].

Explanation:

∑F = ma

200 N + 250 N = (1200 kg) a

a = 0.375 m/s²

A 1200 kg car is put into neutral and pushed by 2 students. The first student pushed the car forward with 200 N of force. The second student pushed with 250 N of force in the same direction, then the acceleration of the car would be 0.375 meters / second².

Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.

As given in the problem if A 1200 kg car is put into neutral and pushed by 2 students. The first student pushed the car forward with 200 N of force. The second student pushed with 250 N of force in the same direction, then we have to find the acceleration of the car,

Acceleration of the car = 450 /1200

                                       = 0.375 meters / second²

Thus, the acceleration of the car would be 0.375 meters / second².

To learn more about Newton's second law here, refer to the link;

brainly.com/question/13447525

#SPJ2

Answer:

Explanation:

We know that , If the frictional force on a system is zero , then the total energy of a system will be conserved.

By using energy conservation

KE₁ +  U₁ = KE₂ + U₂

KE₁=Kinetic energy at location 1

U₁ =Potential energy at location 1

KE₂=Kinetic energy at location 2

U₂=Potential energy at location 2

Therefore, Raymond is thinking in a right way.

Answer:

form a hypothesis

Explanation:

Answer:

85 miles .

Explanation:

Displacement along the 110 South freeway = 260 - 150  =  110 miles

Displacement along the 110 North freeway = 150 - 175   = - 25 miles

Net displacement = 110 - 25 = 85 miles

So Joey's displacement from the 260 mile marker is 85 miles .

Answer:

B

Explanation:

B is the mean position.At the mean position, the velocity of the particle in S.H.M. is maximum and displacement is minimum, that is, x=0. Therefore, K.E. = 1/2 k ( a² – x²) = 1/2 k ( a² – o²) = 1/2 ka². Thus, the maximum kinetic energy is expressed by K.E = ½ ka²

Answer:

Point B is the location of the greatest kinetic energy. This is the point where the pendulum is moving with the greatest velocity.

Explanation:

Answer: If you make certain decisions like changing your diet (for good or worse) increasing physical activity, or playing more video games, things like these can affect your wellness and health for the worse or better.

Answer:

health is the answer to what the role is play in wellness

The study of atomic structure helps us understand more about the way the universe is constructed, how our bodies are made, and the components of life, which we can apply to other sciences in the fields of health and disease prevention, fuels, product industry etc... It basically helps us to understand how we can make new things and how to utilize the power of the universe.

Answer: Studying atoms is important because knowledge about atoms helps people to understand the world around them and produce materials used in daily life. Also, research done on atoms has contributed to the improvement of people's lives through medicine, to the protection of the environment, and to the discovery of new things about the world and the universe.

Explanation:

I did the test

Answer:

(a). The average acceleration during segment A is 2 m/s²

(b). The average acceleration during segment B is zero.

(c). The average acceleration during segment C is 4 m/s².

Explanation:

Given that,

A snowmobile moves according to the velocity-time graph ,

(a), We need to calculate the average acceleration during segment A

Using formula of average acceleration

[tex]a=\dfrac{v_{f}-v_{i}}{t_{2}-t_{1}}[/tex]

Where, [tex]v_{i}[/tex] = initial velocity

[tex]v_{f}[/tex] =final velocity

[tex]t_{i}[/tex] = initial time

[tex]t_{f}[/tex] =final time

Put the value into the formula

[tex]a=\dfrac{40-0}{20-0}[/tex]

[tex]a=2\ m/s^2[/tex]

(b). We need to calculate the average acceleration during segment B

Using formula of average acceleration

[tex]a=\dfrac{v_{f}-v_{i}}{t_{2}-t_{1}}[/tex]

Put the value into the formula

[tex]a=\dfrac{40-40}{50-20}[/tex]

[tex]a=0\ m/s^2[/tex]

(c). We need to calculate the average acceleration during segment C

Using formula of average acceleration

[tex]a=\dfrac{v_{f}-v_{i}}{t_{2}-t_{1}}[/tex]

Put the value into the formula

[tex]a=\dfrac{80-40}{60-50}[/tex]

[tex]a=4\ m/s^2[/tex]

Hence, (a). The average acceleration during segment A is 2 m/s²

(b). The average acceleration during segment B is zero.

(c). The average acceleration during segment C is 4 m/s².

Answer:

turning on the lights

using my phone

using the microwave

Answer:

a. The Special relativity postulate states that the laws of physics apply  in all inertia frames of reference

b. General relativity must be uses a curved space-time

c. Time is dilated for a stationary observer relative to one in motion

Time interval observed on an object in a moving frame of reference is less than the same interval observed on a stationary reference frame

[tex]\Delta t' = \dfrac{\Delta t}{\sqrt{1 - \dfrac{v^2}{c^2}}}[/tex]

Length is contracted

The length of a rod moving with a velocity relative to an observer will appear contracted by a factor [tex]\sqrt{1 - \dfrac{v^2}{c^2}}[/tex], in the direction of the motion.

Explanation:

Answer:

Velocity = 0.0001389 m/s

Explanation:

Given that the

Distance covered = 1 metre

Time taken = 2 hours

Convert the hour to second

1 hour = 60 × 60 = 3600

2 hours = 2 × 3600 = 7200

What is the velocity of a worm moving 1 meter in 2 hours to the East?

Velocity can be referred as speed.

Velocity = distance/ time

Velocity = 1/7200

Velocity = 0.0001389 m/s

Answer: The generation of electricity using fossil fuels.e.g can lead to pollution which cause harm to human beings and environment.

At some times science and technology have been misused or abused by human beings.An example of abuse is the invention of and use of deadly weapons which are harmful to us and environment.

Explanation:

Answer:

Hee answer is B

Explanation:

____________.

Answer:

500 kg/m^3

Explanation:

equation ; p = m / v

m = 15,000

v = 30

p = 15,000 / 30, p = 500, add units at the end!

Hope this helps!!

Answer: Please find the answer in the explanation

Explanation: According to the Newton 3rd law of motion which state that;

In every action, there will be equal and opposite reaction.

when the piston of a fountain pen with a nib is dipped into ink and and the air is released by pressing it, a force is applied which act on the molecules of the ink by pushing the molecules. When the force is released, there will be a reaction force by pulling the molecules of the ink into the pen. Thereby the ink fills in the pen.