You position two plane mirriors at right angles to each other a light ray strikes one mirrior at an angle of 60 to the normal and reflects towards the second mirrior what is the angle of reflection off the second mirrior

Answer:

Thus, the change in the weight of the person is 1.6N , option c is correct.

Explanation:

Answer:

When a nucleus emits an alpha particle, the mass number of the nucleus A. decreases!!!

Explanation:

An atom releases a Alpha particle, its atomic number decreases by two and its mass number decreases by 4.

Explanation:

In the trachea's inner layer, you have small, hair-like structures called cilia. Cilia move in rhythm to push mucus out of your trachea so that you either expel or swallow it

The final velocity of m₁=2kg with its velocity at 5m/s will be 4 m/s.

According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.

The given data in the problem is;

(m₁) is the mass = 2 kg

initial velocity (u₁) =5m/s

(m₂) is the mass  = 0.5

(u₂) initial velocity = 0 m/s

(v) is the velocity  =.?

According to the law of conservation of momentum;

Momentum before collision =Momentum after collision

[tex]\rm m_1u_1 + m_2u_2 = v(m_1 + m_2) \\\\ 2(5) + 0.5(0) = v(2 + 0.5)\\\\10 = 2.5v\\\\ v = \frac{10}{2.5} \\\\ v = 4 \ m/s[/tex]

Hence,The final velocity of m₁=2kg with its velocity at 5m/s will be 4 m/s.

To learn more about the law of conservation of momentum refer;

https://brainly.com/question/1113396

#SPJ1

Answer:

49 N

Explanation:

F = m a

 = 5 * 9.81 =~ 49 N

Answer:

From largest to smallest they are: Universe, galaxy, solar system, star, planet, moon and asteroid.

Explanation:

I am using a calculator for this question so hopefully this helps + I added working out just in case.

a) mean - 124 (add them all together then divide by 25)

b) standard deviation - 7.776888838 (7.76 to d.p)

c) the person might have eaten foods that increase or decrease the BP so every time they took their blood pressure, it might not have been done as the same routine as others (if this makes sense). Also, some blood pressures are lower than others like for example some might go down to 110 but others go all the way up to like 132, does why I said that they might have eaten food or done activites that increases the blood pressure.

Answer:

"light year" - about 6 million million miles

The nearest star is alpha Centauri - about 24 million million miles away

Answer:

The Vibrating parts of a Guitar is it's Strings

Explanation:

Guitars are classified in 2 sections: the neck and the body. Strings run through the neck and body of the guitar. When a string is played its vibration is transmitted from the bridge, resonating throughout the top of the guitar.

Answer:

the strings are the part that vibrates

Answer:

Orange: 3

Violet: 7

Yellow: 4

White: 9

Red: 2

Answer:Orange: 3Violet: 7Yellow: 4White: 9Red: 2

Explanation: is that what you looking for

Answer:

Iron meteorites

Explanation:

Answer:

iron, nickel, iridium, palladium, platinum, gold, and magnesium

You can choose any one which you like.

Explanation:

All minerals that we humans found are found in space.

And minerals unknown are also found.

Answer:

The magnetic separation

Explanation:

It is a process in which magnetically susceptible material is extracted from a mixture using magnetic force. This is best way to separate the mixture of sand and iron fillings as iron is attracted by magnet.

Answer:

As a result, light travels fastest in empty space, and travels slowest in solids. In glass, for example, light travels about 197,000 km/s.

Explanation:

Explanation:

The substance with less quantity of matter has less mass and that with more quantity has more mass..

[tex]...[/tex]

Answer:

the data change decreased and then increased. this went on repeatly but the decrease became less as the increase became more.

(a) The speed  of puck A before the collision is determined as 0.847 m/s.

(b) The change in the total kinetic energy of the system that occurs during the collision is 0.009 J.

The speed of puck A before the collision is calculated from the principle of conservation of linear momentum as follows;

m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂

0.251u₁ + 0.371(0) = 0.251( -0.12) + 0.371(0.654)

0.251u₁ = 0.2125

u₁ = 0.2125/0.251

u₁ = 0.847 m/s to the right

Initial kinetic energy = ¹/₂ x 0.251 x (0.847)² + ¹/₂ x 0.371 x (0) = 0.09 J

Final kinetic energy = ¹/₂ x 0.251 x (-0.12)² + ¹/₂ x 0.371 x (0.654)² = 0.081 J

ΔK.E = 0.081 - 0.09 = 0.009 J ≈ 0 J

Learn more about elastic collision here: https://brainly.com/question/7694106

#SPJ1

The phenomenon known as the Emission Spectra.

Emission spectrum is the phenomenon provides evidence that the hydrogen atom has discrete energy levels.

Emission spectrum is the spectrum of the different energy levels. The occurrence of emission spectrum gives proof that the hydrogen atom has distinct energy levels.

Emission spectrum is the phenomenon provides evidence that the hydrogen atom has discrete energy levels

Hence, the phenomenon is known as emission spectrum.

To learn more about the emission spectrum refer;

https://brainly.com/question/13537021

#SPJ2

Answer:

110.4 v

Explanation:

Find the equivalent resistance of the two parallel circuits

R1 and R2 in parallel   =   R1 * R2 / (R1+ R2) =   1 ohm

 similarly R4 and R5 =  4.77 ohms

Now you can add the three resistances into one  (R3=10)

    1 ohm + 10 ohm + 4.77 ohm = 15.77 ohms

Now

V = IR

V =  7 amps  * 15.77 ohm = 110.4 v

We can confirm that a contact force would be one in which physical contact is needed, while a no contact force does not require contact.

There are many everyday examples to be used to describe each of these forces. A very common no contact force is gravity. The Earth's gravity exerts a force on all things near the planet, but it does not need to be in physical contact to exert this force, thus making gravity a no contact force. An example of a contact force would be if you were to push another person. You are exerting a force that requires physical contact.

Therefore, we can confirm that a contact force would be one in which physical contact is needed, while a no contact force does not require contact.

To learn more about forces visit:

https://brainly.com/question/13191643?referrer=searchResults

[tex]\\ \rm\Rrightarrow T=2\pi\sqrt{\dfrac{l}{g}}[/tex]

[tex]\\ \rm\Rrightarrow T^2=4\pi ^2\dfrac{l}{g}[/tex]

[tex]\\ \rm\Rrightarrow l=\dfrac{T^2g}{4\pi^2}[/tex]

If we solve it we get it in between 60 -80

So

Our average breath rate is 17-20

So the ratio will come near 4+

Answer:

C) Momentum

Explanation:

Refers to an objects mass in motion.

Answer:

See below

Explanation:

At point A    the PE = mgh = 2 * 10 * 1 = 20 J

  at point B, all of the PE , 20 J , is converted to Kinetic Energy

KE = 1/2 m v^2

20 = 1/2 (2)(v^2 )

20 = v^2     v = sqrt 20 = 4.47 m/s

for the friction part

 vf = vo t  + 1/2 a t^2      vf = final velocity = 0 (stopped)

                                       vo = original velocity = 4.47 m/s  

                                         a = -1 m/s^2

  0 = 4.47 t + 1/2 (-1) t^2

            - .5t^2  + 4.47 t = 0

                 t ( -.5t+ 4.47) = 0    shows t =  4.47/.5 = 8.9 seconds

Lines with arrows that point outward radiate from the charge in all directions.

step-1.For a positive point charge the lines will radiate out ward equally in all directions.

step-2.For a negative point charge the lines will point inward equally in all directions.

i hop this help :)

Forming an hypothesis is the first step in the scientific method.

A hypothesis can be defined as a guess as to what will happen during your experiment. Hypothesis can in other terms be defined as a proposed explanation for a phenomenon. For a hypothesis to be a scientific hypothesis, the scientific method requires that one can test it. Scientists generally base scientific hypotheses on previous observations that cannot satisfactorily be explained with the available scientific theories.

Read more on Hypothesis:

https://brainly.com/question/15980493

#SPJ1

a)The speed of the ball at the time of impact will be 8.1 m/sec.

b)The time taken by the ball impacts the surface of trampoline will be 1.1 second.

Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. Its SI unit is m/sec.

Given data;

g( gravitational acceleration) = 9.81 m/s2

u (initial velocity of ball) = 2.5 m/s

h₁(initial height of the ball) = 3.0 m

v (speed of the ball at the time of impact ) ?

The time taken by ball for upward journey = u / g

t₁ = u / g

t₁  = (2.5 m/s) / (9.81 m/s2) =

t₁  =0.2548 s

From second equation of motion,upward vertical distance covered by ball is;

[tex]\rm h_2= \frac{1}{2} gt^2\\\\ h_2=\frac{1}{2} \times 9.81 \times (0.2548)^2\\\\ h_2=0.3184[/tex]

The total distance in the downward direction travelled;

[tex]\rm h_3=h_1+h_2 \\\\ h_3=3.0+0.3184 \\\\ h_3=3.3184 \ m[/tex]

The time taken for the downward motion is;

[tex]\rm t_2 = (\frac{2 \times h_3 }{g} )^\frac{1}{2}\\\\ t_2 = 0.825 \ m/sec[/tex]

The speed of the ball at the time of impact is found as;

[tex]\rm V=gt_2 \\\\ V= 9.81 \times 0.8225 \\\\ V= 8.07 \ m/sec[/tex]

The total time of the flight of ball is;

[tex]\rm t_3 = t_1+t_2 \\\\ t_3=0.2548+0.8225 \\\\ t_3=1.0774 \ sec[/tex]

Hence,the speed of the ball at the time of impact will be 8.1 m/sec and time taken by the ball impacts the surface of trampoline will be 1.1 second.

To learn more about the speed refer to the link;

https://brainly.com/question/7359669

#SPJ1

Answer:

Total resistance in parallel is Rp

So (1/Rp) = (1/12)+(1/16)+(1/20)

Rp = ?

impedance is 25

25 = Rp + Rs

put the value of Rp you'll get the answer.

Answer:

Hence, electric field intensity at equatorial point is given by, $\therefore {E_p} = - \dfrac{1}{{4\pi {\varepsilon _0}}}\dfrac{{\vec P}}{{{d^3}}}$. And the direction of the electric field is always opposite to that of the electric dipole.