When light passes through sequential interfaces, there may be a change of phase upon reflection at each interface.

a. True
b. False

Answer:

D

Explanation:

Given that one rock is thrown upward at 4.5 m/s and another thrown downward at 3.4 m/s. What is the relative velocity of the first rock

from the perspective of the second rock? Assume that up is positive.

Solution.

Since both of them are moving in the opposite direction, the relative velocity of the first rock from the perspective of the second rock will be

Relative velocity = 3.4 - 4.5

Relative velocity = - 1.1 m/s

Therefore, the relative velocity from the perspective of the second rock is negative 1.1 m/s.

The correct answer is option D.

Answer:

his type of shock is called inelastic

Explanation:

This exercise is for vehicle crashes, which corresponds to exercise is momentum conservation.

We must begin by defining a system formed by the two cars so that the forces during the crash have been intense and the moment is preserved.

Looking for the moments

initial. Before the crash

           p₀ = m₁ v₁₀

final. After the crash

           p_f = (m₁ + m₂) v

the conservation of the moment is written

           p₀ = p_f

           m₁ v₁₀ = (m₁ + m₂) v

This type of shock is called inelastic and has the characteristics that the kinetic energy is not conserved.

Answer:

The wavelength of the waves on the string is found using v = λf:

λ = v/f = 315/370 = 0.85135m

The first harmonic (fundamental) standing wave  formed on the string  has nodes only at the ends (see diagram in link) so:

String length = λ/2 = 0.85135/2 = 0.426m (to 3 sig. figs.)

Answer:

A system of two co-axial cylindersof different diameters which rotate together is called wheel and axle example; the door knob , knob of the tap ,screw driver,water tap

Answer:

=-21.43

Explanation:

::::::::::::::::::

We have that the focal length is

[tex]f=19.058[/tex]

From the Question we are told that

image distance [tex]v=12.9[/tex]

object distance [tex]u=32.4[/tex]

Generally the equation for focal length   is mathematically given as

[tex]\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\\\\\frac{1}{f}=\frac{1}{12}-\frac{1}{32.4}[/tex]

[tex]f=19.058[/tex]

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Answer:

Speed = 575 m/s

Mechanical energy is conserved in electrostatic, magnetic and gravitational forces.

Explanation:

Given :

Potential difference, U = [tex]$-3.45 \times 10^{-3} \ V$[/tex]

Mass of the alpha particle, [tex]$m_{\alpha} = 6.68 \times 10^{-27} \ kg$[/tex]

Charge of the alpha particle is, [tex]$q_{\alpha} = 3.20 \times 10^{-19} \ C$[/tex]

So the potential difference for the alpha particle when it is accelerated through the potential difference is

[tex]$U=\Delta Vq_{\alpha}$[/tex]

And the kinetic energy gained by the alpha particle is

[tex]$K.E. =\frac{1}{2}m_{\alpha}v_{\alpha}^2 $[/tex]

From the law of conservation of energy, we get

[tex]$K.E. = U$[/tex]

[tex]$\frac{1}{2}m_{\alpha}v_{\alpha}^2 = \Delta V q_{\alpha}$[/tex]

[tex]$v_{\alpha} = \sqrt{\frac{2 \Delta V q_{\alpha}}{m_{\alpha}}}$[/tex]

[tex]$v_{\alpha} = \sqrt{\frac{2(3.45 \times 10^{-3 })(3.2 \times 10^{-19})}{6.68 \times 10^{-27}}}$[/tex]

[tex]$v_{\alpha} \approx 575 \ m/s$[/tex]

The mechanical energy is conserved in the presence of the following conservative forces :

-- electrostatic forces

-- magnetic forces

-- gravitational forces

Answer:

the uncertainty in the distance measurement is 0.5148

Explanation:

Given the data in the question;

uncertainty in locating the center of the magnet is estimated to be 0.25 cm,

uncertainty in locating the position of the sensor in the phone is estimated to be 0.45 cm,

Using quadrature method, uncertainty in the distance measurement = ?

We know that;

Using  quadrature method, Combined Uncertainty calculated by;

U[tex]_c[/tex] = √( U₁² + U₂² + ........... )

where U₁ is uncertainty in first measurement and U₂ is uncertainty in second measurement, et cetera.

now we substitute;

U[tex]_c[/tex] = √( U₁² + U₂² )

U[tex]_c[/tex] = √( (0.25)² + (0.45)² )

U[tex]_c[/tex] = √( 0.0625 + 0.2025 )

U[tex]_c[/tex] = √( 0.265 )

U[tex]_c[/tex] = 0.5148

Therefore, the uncertainty in the distance measurement is 0.5148

Answer:

Forces can affect an object.

Balanced forces allow an object to continue moving at a constant motion (law of inertia).

Unbalanced forces cause a change in motion.

Answer:

Because of my physics teacher I would put this entire explanation below if i were u

Explanation:

Forces affect how objects move. They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving.

Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity. Remember that acceleration is a change in velocity. So forces cause acceleration.

Answer:

electrical transfers into mechanical energy Explanation:

Answer:

[tex]-46.24\ \text{J}[/tex]

Explanation:

[tex]m_1[/tex] = Mass of block at rest = 17 kg

[tex]m_2[/tex] = Mass of moving block = 2.75 kg

[tex]u_1[/tex] = Velocity of block at rest = 0

[tex]u_2[/tex] = Velocity of moving block = 6.25 m/s

v = Velocity of the combined mass

As the momentum in the system is conserved we get

[tex]m_1u_1+m_2u_2=(m_1+m_2)v\\\Rightarrow v=\dfrac{m_1u_1+m_2u_2}{m_1+m_2}\\\Rightarrow v=\dfrac{17\times 0+2.75\times 6.25}{17+2.75}\\\Rightarrow v=0.87\ \text{m/s}[/tex]

Change in kinetic energy is given by

[tex]\Delta K=K_f-K_i\\\Rightarrow \Delta K=\dfrac{1}{2}(m_1+m_2)v^2-\dfrac{1}{2}m_2u_2^2\\\Rightarrow \Delta K=\dfrac{1}{2}\times (17+2.75)0.87^2-\dfrac{1}{2}\times 2.75\times 6.25^2\\\Rightarrow \Delta K=-46.24\ \text{J}[/tex]

THe change in kinetic energy in the system is [tex]-46.24\ \text{J}[/tex].

The change in kinetic energy in the system is -46.24 J.

Since m1 = Mass of block at rest = 17 kg

m2  = Mass of moving block = 2.75 kg

u1 = Velocity of block at rest = 0

u2 = Velocity of moving block = 6.25 m/s

v = Velocity of the combined mass

So,

momentum in the system should be  

[tex]m_1v_1 +m_2v_2 = (m_1 + m_2)v\\\\v = m_1v_1+m_2v_2\div m_1 + m_2\\\\= 17\times 0+2.75\times 6.25 \div 17 + 2.75[/tex]

= 0.87 m/s

Now the change in the kinetic energy should be

[tex]= 1\div 2 (m_1 + m_2)v^2 - 1\div 2 m_2v^2\\\\= 1\div 2\times (17 + 2.75)0.87^2 - 1\div 2\times 2.75\times 6.25^2[/tex]

= -46.24J

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Magnetism is the result of the "spin" of the electron and most of these cancel each other out in larger bodies thus most things not being magnetic.

Answer:

Fusion is the process that powers the sun and the stars. It is the reaction in which two atoms of hydrogen combine together, or fuse, to form an atom of helium. In the process some of the mass of the hydrogen is converted into energy. ... The sun and stars do this by gravity.

Explanation:

hope it helps friend

Answer: The yellow light with a frequency equal to 5.21 x 1014 Hz will have a wavelength of E) 576 nm

Answer:

1)   F = 8.789 10² N, 2)   F = 1.5 10⁴ N

Explanation:

We can solve this exercise using Coulomb's law

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

Knowing that charges of the same sign repel

let's apply this equation to our case

1) the charges are q = - 0.0025 C and the distance between them r = 8 m

       we calculate

           F = 9 10⁹ 0.0025 0.0025 /8²

           F = 8.789 10² N

as the two charges are of the same sign the force is repulsive

2) q₁ = -0.004C and q₂ = -0.003 C with a distance of r = 3.0 m

    we calculate

             F = 9 10⁹ 0.004 0.003 / 3²

             F = 1.5 10⁴ N

Answer:

A. The bus has more kinetic energy than the car.

Explanation:

We know that

Kinetic energy is the energy amount possessed from the body as in the motion

Also, the following formula should be used to determine the kinetic energy

Kinetic energy = 1 ÷ 2mv²

Here m represents the mass of the body  

and v represents the velocity of the body.

Therefore it should be based on the mass & velocity of the body  

In the case when the passenger bus have more kinetic energy as compared to the car so this is because of the the big mass  

Therefore, the first option is correct

Answer:

The boiling point temperature of this substance when its pressure is 60 psia is  480.275 R

Explanation:

Given the data in the question;

Using the Clapeyron equation

[tex](\frac{dP}{dT} )_{sat } = \frac{h_{fg}}{Tv_{fg}}[/tex]

[tex](\frac{dP}{dT} )_{sat } = \frac{\frac{H_{fg}}{m} }{T\frac{V_{fg}}{m} }[/tex]

where [tex]h_{fg[/tex] is the change in enthalpy of saturated vapor to saturated liquid ( 250 Btu

T is the temperature ( 15 + 460 )R

m is the mass of water ( 0.5 Ibm )

[tex]V_{fg[/tex] is specific volume ( 1.5 ft³ )

we substitute

[tex](\frac{dP}{dT} )_{sat } =( \frac{250Btu\frac{778Ibf-ft}{Btu} }{0.5})[/tex] / [tex]( (15+460)\frac{1.5}{0.5})[/tex]  

[tex](\frac{dP}{dT} )_{sat } =[/tex] 272.98 Ibf-ft²/R

Now,

[tex](\frac{dP}{dT} )_{sat } =[/tex] [tex](\frac{P_2 - P_1}{T_2 - T_1})_{sat[/tex]

where P₁ is the initial pressure ( 50 psia )

P₂ is the final pressure ( 60 psia )

T₁ is the initial temperature ( 15 + 460 )R

T₂ is the final temperature = ?

we substitute;

[tex]T_2[/tex] [tex]= ( 15 + 460 ) + \frac{(60-50)psia(\frac{144in^2}{ft^2}) }{272.98}[/tex]

[tex]T_2 = 475 + 5.2751\\[/tex]

[tex]T_2 =[/tex] 480.275 R

Therefore, boiling point temperature of this substance when its pressure is 60 psia is  480.275 R

Answer:

Reading on the ammeter: [tex]2.5\; \rm A[/tex].

Value of [tex]R[/tex]: [tex]2.5\; \rm \Omega[/tex].

Explanation:

The three resistors are connected to the power supply in parallel. Hence, the voltage across each one of them would be equal to the voltage of the power supply.

Apply Ohm's Law to calculate the voltage across the resistor at the center:

Value of this resistor: [tex]5\; \rm \Omega[/tex].

Current through this resistor: [tex]I = 3\; \rm A[/tex]

By Ohm's Law, the voltage [tex]V[/tex] across this resistor would be [tex]5\; \rm \Omega \times 3\; \rm A = 15\; \rm V[/tex].

Hence, by the reasoning above, the voltage of the power supply and the voltage across the other two resistors would all be [tex]15\; \rm V[/tex].

Apply Ohm's Law (again) to calculate the current through the [tex]6\; \rm \Omega[/tex] resistor, given that the voltage across that resistor is [tex]15\; \rm V[/tex]:

[tex]\displaystyle I = \frac{V}{R} =\frac{15\; \rm V}{6\; \rm \Omega} = 2.5\; \rm A[/tex].

The ammeter is connected to the [tex]6\; \rm \Omega[/tex] resistor in a serial configuration. Hence, the reading of the ammeter would be equal to the current through this [tex]6\; \rm \Omega\![/tex] resistor: [tex]2.5\; \rm A[/tex].

Also because the three resistors are connected to the power supply in parallel, the current through the power supply would be equal to the sum of the current through each resistor.

Current through the power supply: [tex]11.5\; \rm A[/tex].

Current through the [tex]6\; \Omega[/tex] and the [tex]5\; \Omega[/tex] resistor: [tex]2.5\; \rm A[/tex] and [tex]3\; \rm A[/tex], respectively.

[tex]11.5\; \rm A = 2.5\; \rm A + 3\; \rm A + (\text{Current through $R$})[/tex].

Hence, the current through the unknown resistor [tex]R[/tex] would be:

[tex]11.5\; \rm A - 2.5\; \rm A - 3 \; \rm A = 6\; \rm A[/tex].

Apply Ohm's Law to find the value of resistor, given that the voltage across it is [tex]15\; \rm V[/tex] (same as the power supply) and that the current through it is [tex]6\; \rm A[/tex]:

[tex]\displaystyle R = \frac{V}{I} = \frac{15\; \rm V}{6\; \rm A} = 2.5\; \Omega[/tex].

Answer:

Refraction is another way that waves interact with matter. ... Waves bend as they enter a new medium because they start traveling at a different speed in the new medium. For example, light travels more slowly in water than in air. This causes it to refract when it passes from air to water or from water to air.

Explanation:

i hope this helps but if it doesnt im rlly srry :p

Answer:

B

Explanation: Given that an elevator moving down passes its neighbor, an elevator moving up. Their speed relative to one another is 8 m/s. What is the velocity of each elevator relative to someone standing on the first floor? Assume that the elevators are traveling at the same speed, and that the upward direction is positive.

O Both elevators are moving at 8 m/s.

y Falling Objects

O One elevator is moving at 4 m/s; the other elevator is moving at -4 m/s.

O Both elevators are moving at 4 m/s.

tive Velocity

O One elevator is moving at 8 m/s; the other elevator is moving at -8 m/s.

Solution.

Since the upward direction is positive, the downward direction will be negative.

For their speed relative to one another to be 8 m/s, the individual velocity will be:

4 - ( - 4 ) = 8

Therefore, the correct answer is:

One elevator is moving at 4 m/s; the other elevator is moving at -4 m/s

Which is option B

Because the negative sign multiply by negative sign will give positive.

That is,

4 + 4 = 8

Answer:

Hooke law describes the behaviour of elastic material under tension

Answer:

The answer is "12388.17"

Explanation:

[tex]l = 2.1 cm = 2.1 \times 10^{-2}\ m\\\\k = 1.00059\\\\\eta = \sqrt{k}= \sqrt{1.00059}\\\\\lambda = 663 nm = 663 \times 10^{-9}\ m[/tex]

Users now know that perhaps the number of fingers the shift is provided when a path difference [tex]\Delta d[/tex] are inserts between both the two arms  

[tex]N = \frac{\Delta d}{\lambda}[/tex]

The optical pull-up in the arm is initially given by

[tex]d = 2\eta l[/tex]

Its new length of the different sense as the reflection coefficient adjustments between [tex]\eta[/tex] (air) and 1 so if we evacuate air from of the arm (vacuum).

The new length of a path is therefore

 [tex]d'' = 2l[/tex]

Therefore, the different path  

[tex]\Delta d=d-d''=2l(\eta -1)[/tex]

So, The fringe shifts number are

[tex]N= \frac{2l(\eta -1)}{\lambda}[/tex]

    [tex]= \frac{2 \times 2.1 \times 10^{-2} (\sqrt{1.00059}-1)}{663 \times 10^{-9}}\\\\=12388.17[/tex]

Answer:

When you lift an object, you add the energy of lifting to the object. Potential energy can be converted to kinetic energy. The kinetic energy of an object can sometimes be greater than the potential energy it originally possessed.

Explanation:

Your answer is True.

The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.

The answer is : C

Answer:

Rain came along with lower temps

Explanation:

There was no rain on the warmer days

There were more clouds as the week went on

and the temp decreased during the week so rain came with lower temps is the only one that can be correct