Changes of
Which now represents the change of state described
above?
M
ham shows changes of state between solid.
se atoms of a substance lase energy
Bacharest Betore the change, the atoms
ether but are able to slide past one another

Answer:

B

Explanation:

i think

Answer:

D. makes rules for other banks

Explanation:

Answer:

a) v = 18.86 m / s, b)  h = 8.85 m

Explanation:

a) For this exercise we can use the conservation of energy relations.

Starting point. Like the compressed spring

          Em₀ = K_e + U = ½ k x² + m g x

the zero of the datum is placed at the point of the uncompressed spring

Final point. With the spring if compress

           Em_f = K = ½ m v²

how energy is conserved

          Em₀ = Em_f

          ½ k x² + m g x = ½ m v²

           v² = [tex]\frac{k}{m}[/tex]  x² + 2gx

let's reduce the magnitudes to the SI system

          m = 500 g = 0.500 kg

          x = -45 cm = -0.45 m

the negative sign is because the distance in below zero of the reference frame

let's calculate

           v² = [tex]\frac{900}{0.500}[/tex]  0.45² + 2 9.8 (- 0.45)

           v = √355.68

           v = 18.86 m / s

b) For this part we use the conservation of energy with the same initial point and as an end point at the point where the rock stops

           Em_f = U = m g h

           Em₀ = Em_f

            ½ k x²2 + m g x = m g h

            h = ½  [tex]\frac{k}{g}[/tex]   x² + x

let's calculate

           h = [tex]\frac{1}{2} \ \frac{900}{9.8 } \ 0.45^2[/tex] - 0.45

           h = 8.85 m

measured from the point where the spring is uncompressed

Answer:

the hair and the comb are both neutral

Answer:

a)  T² = ([tex]\frac{4\pi ^2}{GM}[/tex])  r³

b) veloicity the dependency is the inverse of the root of the distance

kinetic energy  depends on the inverse of the distance

potential energy dependency is the inverse of distance

angular momentum depends directly on the root of the distance

Explanation:

1) for this exercise we will use Newton's second law

            F = ma

in this case the acceleration is centripetal

            a = v² / r

the linear and angular variable are related

           v = w r

we substitute

           a = w² r

force is the universal force of attraction

           F = [tex]G \frac{m M}{r^2}[/tex]

we substitute

         [tex]G \frac{m M}{r^2} = m w^2 r[/tex]

         w² = [tex]\frac{GM}{r^3}[/tex]

angular velocity is related to frequency and period

         w = 2π f = 2π / T

we substitute

            [tex]( \frac{2\pi }{T} ) = \frac{GM}{r^3}[/tex]

the final equation is

             T² = ()  r³

b) the speed of the orbit can be found

           v = w r

            v = [tex]\sqrt{\frac{GM}{r^3} } \ r[/tex]

            v = [tex]\sqrt{\frac{GM}{r} }[/tex]

in this case the dependency is the inverse of the root of the distance

Kinetic energy

           K = ½ M v²

           K = ½ M GM / r

           K = ½ GM² 1 / r

the kinetic energy depends on the inverse of the distance

Potential energy

          U =

          U = -G mM / r

dependency is the inverse of distance

Angular momentum

          L = r x p

for a circular orbit

           L = r p = r Mv

           L =

         L =

The angular momentum depends directly on the root of the distance

Answer:

R = 19.36  ohms

Explanation:

Given that,

The power of an electric motor, P = 2500 Watts

The voltage of the circuit, V = 220 V

We need to find the resistance of the motor. We can find it as follows :

[tex]P=\dfrac{V^2}{R}\\\\R=\dfrac{V^2}{P}\\\\R=\dfrac{(220)^2}{2500}\\R=19.36\ \Omega[/tex]

So, the resistance of the motor is 19.36  ohms.

Answer:

c. Bullfrogs

Explanation:

I did this lesson and got it right! :)

Answer:

The square plates of a 3000-pF parallel-plate capacitor measure 40 mm by 40 mm and are separated by a dielectric that is 0.29 mm thick and completely fills teh region between the plates.

Explanation:

Answer:

The two moments must be the same:

p1=p2

m1v1=m2v2

v2=(m1v1)/m2

v2=(90 kg x 0.9 m/s)/110kg=0.7 m/s

Answer:

1.Contact because its a contact force

2 Contact because when the car is stopping it is coming in to contact with the ground.

3 non Contact because magnets don't need to have contact they pull

4 non Contact because its not a contact force

Answer:

T_f = 44.6 ° C

Explanation:

We can solve this exercise using the calorimetry relations

          Q = m c_e ΔT

          ΔT = [tex]\frac{Q}{m \ c_e}[/tex]

let's calculate

          ΔT = -7.96 10⁴ /(0.625 4186)

          ΔT = -3.04 10¹

The negative sign indicates that the temperature decreases

the temperature variation is

          T_f - T₀ = ΔT

          T_f = T₀ + ΔT

          T_f = 75.0 - 30.4

          T_f = 44.6 ° C

Answer: yes you can

Explanation: because i i have a trying and a squar that have the same mass it would caunt as the same

Yes we can get two objects with identical masses to balance in this type of scenario.

This is defined as the quantity of matter which is present in a body at a given point in time.

The two objects with identical masses can be made to balance through the use of a string and a pulley.

Read more about Mass here https://brainly.com/question/19385703

#SPJ9

Answer:

The correct answer for this would be D.

Explanation:

Are tight coils of DNA

Answer:

B radiation

Explanation:

every type of transmitted waves are radioactive in a way.

Answer:

Your ans is B)

Explanation:

Hope its right

if wrong firgive me

Answer:

2ohms

Explanation:

the net resistance is given by

1/R=1/R1 +1/R2,we are supposed to find R

thus by making R the subject ....

R=R1•R2/R1+R2

R=3•6/3+6

R=18/9 =2Ohms

Answer:

the correct  is D

Explanation:

In the calorimetry exercises, if there are no losses, we assume that all the heat lost by one body is absorbed by the other, but if there are losses

         Q_ {yielded} = Q_ {absent} + Q_ {lost}

Since energy cannot be created or destroyed, they only ask to change, therefore the term of the absorbed heat must decrease, consequently the final temperature of the system is lower when there is loss of energy.

When checking the answers, the correct one is D

Answer:

7i, 5j, 0k

Explanation:

Add up the two vectors.

Add

i+i       1+6  = 7i

j+j       2+3 = 5j

k+k    -2+2 = 0k

therefore A+B = (7i, 5j, 0k)

Answer:

I₁ = I₂ = I₃ = 12 A

Explanation:

Since the resistors are connected in parallel across a battery. Hence, the voltage across each of them will be the same, which will be equal to the voltage of the power supply. Since each resistor has the same resistance of 5 Ω. Therefore. the current across each resistor will also be the same. We can easily calculate these current values by the use of Ohm's Law, as follows:

[tex]V = IR\\I_{1}=I_{2}=I_{3}=\frac{V}{R} \\\\I_{1}=I_{2}=I_{3}=\frac{9\ Volt}{5 \Omega}\\\\[/tex]

I₁ = I₂ = I₃ = 12 A

Hello,

Light is an electromagnetic wave, its speed is maximum in space and almost in the air where interactions have almost no effect. In other non-opaque media, light is subject to several phenomena: refraction and reflection. Part of the incident ray will be reflected in the same medium while the other part will be refracted in the new medium with a lower speed. In general, the medium influences the speed, and therefore the wavelength.  

Answer:

t = 9.38 s

Explanation:

Given that,

The speed of the sound wave, v = 343 m/s

Distance, d = 1610 m

We need to find the time taken to travel a mile. The distance traveled by the sound is 2d. Using the formula for speed,

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

t is the time taken to travel a mile

So,

[tex]t=\dfrac{2d}{v}\\\\t=\dfrac{2\times 1610}{343}\\\\t=9.38\ s[/tex]

So, it will take 9.38 seconds.

Answer:

4.69s

Explanation:

The formula to find time is time = distance / velocity

Plug the numbers into the formula

So

1610 / 343

= 4.69s

Answer:

2. Socially constructed

Explanation:

Answer:

8.7 m/s

Explanation:

Given data

Mass= 0.6kg

radius= 0.9m

Force= 50N

A. Please see attached the FBD of the stone

B. Apply the formula

F= mv^2/r

Substitute

50= 0.6*v^2/0.9

cross multiply

50*0.9= 0.6v^2

45= 0.6v^2

v^2= 45/0.6

v^2= 75

v= √75

v= 8.7 m/s

Hence the maximum speed attained without breaking the string is 8.7 m/s

Answer: iDc im in 3grade

Explanation:sorry

Answer:

Workdone = 0.025 Joules

Explanation:

Given the following data;

Workdone = 2J

Extension = 42 - 24 = 18 cm to meters = 18/100 = 0.18m

The workdone to stretch a string is given by the formula;

Workdone = ½ke²

Where;

k is the constant of elasticity.

e is the extension of the string.

We would solve for string constant, k;

2 = ½*k*0.18²

2 = ½*k*0.0324

Cross-multiplying, we have;

4 = 0.0324k

k = 4/0.0324

k = 123.46 N/m

a. To find the workdone when e = 32, 34.

Extension = 34 - 32 = 2 to meters = 2/100 = 0.02m

Workdone = ½*123.46*0.02²

Workdone = 61.73 * 0.0004

Workdone = 0.025 Joules

Therefore, the amount of work (in J) needed to stretch the spring from 32 cm to 34 cm is 0.67.

Answer:

electric charge

Answer:

Electric charge.

Explanation:

Coulomb, unit of electric charge in the metre - kilogram - second - ampere system, the basis of the SI system of physical units. It is abbreviated as C. The coulomb is defined as the quantity of electricity transported in one second by a current of one ampere.

Explanation:

36. How long does it take a car to slow down from a speed of 54 km/h to 32 km/h over a distance of 65 m? Answer in seconds. 37.

x-component is V·cos(angle)

y-component is V·sin(angle)

When the angle is 45°, its sin and cos are both 1/2·√2 .

Vx = 20·√2 = 28.28 m/s

Vy = 20·√2 = 28.28 m/s