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4. Which of the following is the best example of diffraction?
a. Your voice echoing back when you shout into a canyon
b. A straw appearing to bend when you place it in a glass of water
C. A prism breaking a beam of light into its component colors
d. The music on your stereo getting louder when you turn up the volume

5. What is the main difference between refraction and diffraction?
a. Refraction is a phenomenon that affects light; diffraction is a phenomenon that affects
sound.
b. Refraction involves the bending of light; diffraction involves the bending and spreading
of light, usually around an obstacle.
c. Refraction usually happens in the atmosphere; diffraction usually happens closer to the
earth's surface.
d. Refraction involves changes to the density of light; diffraction involves changes to the
speed of light.

Answer/Explanation:

Phyllite is a very common metamorphic rock, found in many parts of the world. It forms when sedimentary rocks are buried and mildly altered by the heat and directed pressure of regional metamorphism.

Answer:

metamorphic rock

Explanation:

Phyllite is a very common metamorphic rock, found in many parts of the world. It forms when sedimentary rocks are buried and mildly altered by the heat and directed pressure of regional metamorphism.

Answer:

Earth is nearest the Sun in July and farthest away in July.

Explanation:

Answer:

Correct Answer: B.

Explanation:

Earth is nearest the Sun in January and farthest away in July. Explanation: According to Kepler's Second Law, a planet travels fastest when it is nearest its sun. This means that Earth is actually closest to the Sun in January, when it is winter in the northern hemisphere!

Answer:

Use of lubricants: In machines, friction can be reduced by applying lubricants between the contact surfaces to fill the fine pores or depressions in the surfaces and make them smooth thereby reducing friction. Polishing : unevenness of the surfaces can be reduced by polishing, thereby reducing the friction.

Explanation:

Answer:

hello your question is incomplete attached below is the complete question

answer: Fg / Fe does not change ; it is the same nonzero value for all separations ( A )

Explanation:

Given that distance between proton and electron is 1 cm

Fg = Gm1m2 / r^2

where :

G ( gravitational constant )= 6.67 * 10^-11 Nm^2 / kg^2

m1 ( mass of proton ) = 1.67 * 10^-27 kg

m2 ( mass of electron ) = 9.11 * 10^-31 kg

Electrical force

Fe = kq1q2 / r^2

k = 9*10^9

hence ;

Fg / Fe = (Gm1m2 / r^2) / (kq1q2 / r^2 )

            = Gm1m2 / kq1q2

Answer:

it covers your phone so when you drop it it reduces the chance and breaking

Answer:

The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.

Answer:

2.47 s

Explanation:

Convert the final velocity to m/s.

We have the acceleration of the gazelle, 4.5 m/s².

We can assume the gazelle starts at an initial velocity of 0 m/s in order to determine how much time it requires to reach a final velocity of 11.1111 m/s.

We want to find the time t.

Find the constant acceleration equation that contains all four of these variables.

Substitute the known values into the equation.

The Thompson's gazelle requires a time of 2.47 s to reach a speed of 40 km/h (11.1111 m/s).

Answer:

the final velocity of the wagon is 6 m/s.

Explanation:

Given;

initial velocity of the wagon, u = 4 m/s

mass of the wagon, m = 35 kg

energy applied to the wagon, E = 350 J

The final velocity of the wagon is calculated as;

E = ¹/₂m(v² - u²)

[tex]m(v^2-u^2) = 2E\\\\v^2-u^2 = \frac{2E}{m} \\\\v^2 = \frac{2E}{m} + u^2\\\\v = \sqrt{\frac{2E}{m} + u^2} \\\\v = \sqrt{\frac{2(350)}{35} + (4)^2}\\\\v = 6 \ m/s[/tex]

Therefore, the final velocity of the wagon is 6 m/s.

Given:

Wagon's initial velocity,

Mass,

Applied energy,

We know,

→ [tex]E = \frac{1}{2} m(v^2-u^2)[/tex]

→ [tex]m(v^2-u^2) = 2E[/tex]

or,

→      [tex]v^2-u^2 = \frac{2E}{m}[/tex]

→               [tex]v= \sqrt{\frac{2E}{m} +u^2}[/tex]

By substituting the values,

                    [tex]= \sqrt{\frac{2(350)}{35}+(4)^2 }[/tex]

                    [tex]= 6 m/s[/tex]

Thus the answer above is correct.  

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Given :

A 1200 kg truck traveling at 20 m/s towards the east.

To Find :

The magnitude and direction of the momentum.

Solution :

We know, momentum is given by :

Momentum, P = mv

P = 1200 × 20 kg m/s

P = 24000 kg m/s

Now, we know, direction of momentum is same as the direction of velocity.

Therefore, momentum of truck is 24000 kg m/s and direction is towards the east.

Answer:

B

Explanation:

Disregard a goal if you don't achieve it

The speed of air greatest in a medium with high pressure. Air is moving from high pressure to low pressure areas called the winds.

The natural movement of air or other gases in relation to a planet's surface is referred to as wind. There are many different sizes of winds, ranging from thunderstorm flows that last only a few minutes to local breezes.

Large-scale atmospheric circulation is primarily brought on by the planet's rotation and the difference in temperature between the equator and the poles (Coriolis effect).

The air can move through a medium as well through vacuum. Air blows with the highest speed when the medium have higher temperature and pressure.

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Answer:

yes

Explanation:

yes

Answer:

medium

Explanation

The energy of a mechanical wave can travel only through matter. The matter through which the wave travels is called the medium (plural, media). The medium in the water wave pictured above is water, a liquid

Answer:

v2 = 0.6 m/s in opposite direction

Explanation:

The computation of the speed of the raft is as follows

The center of system mass would be remains at the same place also it has no external force applied

Therefore

V = 0

So,  

M1.V1= - (M2.V2)

where,

M1 = 60 kg, V1 = 1.5 m/s

M2 = 150 kg

Now  

60 × 1.5 = - 150 × v2

v2 = -0.6 m/s

v2 = 0.6 m/s in opposite direction

Answer:

E =250 J

Explanation:

Given that,

The spring constant of the spring, k = 500 N/

It is stretched to a distance of 1 m

We need to find how much elastic potential energy does the spring have stored in it.

The energy stored in the spring is called elastic potential energy. It is given by the formula as follows :

[tex]E=\dfrac{1}{2}kx^2\\\\E=\dfrac{1}{2}\times 500\times 1^2\\\\E=250\ J[/tex]

So, 250 J of energy is stored in the spring.

Answer:

See the explanation.

Explanation:

Q9. Irregular reflection happens when a set of parallel beams are reflected from non-smooth surface which results in non-parallel reflected beams.

Q10.

i) Periscope

ii) There are different types of periscopes but the main characteristic of this instrument is observation over the obstacles or in general objects that are not in the line-of-sight. Basic Periscope uses parallel angled mirrors to project objects that are above the surface in submarines.

Answer:

the material of the phone case

The purpose of a cell phone cover is to protect your phone from impact forces. It is done by absorbing the impact of force by back cover.

What is Force ?

Force is responsible for the motion of an object. it produces acceleration in the body. According to newton's second law force is mass times acceleration i.e. F =ma. Its SI unit is N which is equivalent to kg.m/s².

The case is made in such a way that, if the cell phone is dropped, the cover will absorb the kinetic energy of the falling phone by the means of deforming without transferring the impact onto the phone.

Cell phone cover is made up of rubber which can restore the forces like a spring. when u apply force to the rubber it get displaced and applied force is stored in the rubber. when cell phone drops, rubber of the cover absorbs the energy of impact. it also provides shied protection to the phone.

Hence this is how cell phone case do this.

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Answer:

A lot of Dietary Fiber.

Explanation:

Answer:

Red apples get their color from anthocyanins. These are pigments, or natural colorings, that develop as the apple grows. ... It absorbs all the colors of the rainbow—except for red. The red light reflects off the apple and our brain and eyes work together to let us know what color we are seeing.

Answer:

Explanation:

A 60W bulb , consumes electrical energy of 60 J per second but it does not give out all the energy in the form of light . Most of the energy consumed by it is wasted in the form of heat . Only a fraction of energy is converted into light energy .

Hence, it is wrong to say that bulb supplies 60 J of light energy each second .

Answer:

a

Explanation:

Answer: reflection

Explanation:

Answer:

A wave has a wavelength of 5 meters and a frequency of 3 hertz.

Explanation:

Answer:

12 m/s

Explanation:

Answer:

Jennifer

Explanation:

she has more mass which means she is using more force

Answer:

12556.8Nm

Explanation:

A 4 m long, 500 kg steel beam extends horizontally from the point where it is bolted to the frame of a building. A 70 kg man stands on the far end of the beam. What is the magnitude of the torque at the point where the beam attaches to the building

Step one:

Given data

Length of steel x =4m

Mass of steel m1=500kg

Mass of man m2=70kg

The center of the mass of the steel is from the center

Cm=x/2

Cm=4/2= 2m

Torque =force*perpendicular distance

Force =mg

The total torque =torque due to weight of steel +torque due to the man's weight

Total torque = 500*9.81*2+70*9.81*4

Total torque =9810+2746.8

Total torque =12556.8Nm

Answer:

5kg

Explanation:

The cart with the least amount of mass will result in the fastest acceleration.

The cart with the fastest acceleration is 5 kg cart because its mass is the smallest.

The given parameters;

According to Newton's second law of motion, the force applied to an object is directly proportional to the product of mass and acceleration of the object.

F = ma

The acceleration of the 5 kg cart is calculated as follows;

[tex]a = \frac{F}{m} \\\\a = \frac{90}{5} = 18 \ m/s^2[/tex]

The acceleration of the 6 kg cart is calculated as follows;

[tex]a = \frac{F}{m} \\\\a = \frac{90}{6} = 15 \ m/s^2[/tex]

The acceleration of the 8 kg cart is calculated as follows;

[tex]a = \frac{F}{m} \\\\a = \frac{90}{8} = 11.25 \ m/s^2[/tex]

The acceleration of the 9 kg cart is calculated as follows;

[tex]a = \frac{F}{m} \\\\a = \frac{90}{9} = 10 \ m/s^2[/tex]

Thus, the cart with the fastest acceleration is 5 kg cart because its mass is the smallest.

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The surface tension acts to hold the surface intact. Capillary action occurs when the adhesion to the surface material is stronger than the cohesive forces between the water molecules. ... Water wants to stick to the glass and surface tension will push the water up, until the force of gravity prevents further rise.

Narrower tube openings allow capillary action to pull water higher

Answer:

a. The magnitude of the resultant velocity vector of the fish is approximately 5.83 m/s

The direction of the resultant velocity vector of the fish is approximately 30.93° relative to the direction of the river

b. The magnitude of the resultant velocity vector of the surfer is approximately 6.083 m/s

The direction of the resultant velocity vector of the surfer is approximately 9.46° relative to the direction of the wave

Explanation:

a. The given parameters of the fish and the river are;

The speed with which the fish is swimming across the river, v₁ = 3.0 m/s

The velocity  with which the river is flowing, v₂ = 5.0 m/s

Therefore, in vector form, we have;

v₁ = 3.0·j

v₂ = 5.0·i

The resultant velocity, R = v₁ + v₂ = 5.0·i + 3.0·j

∴ R = 5.0·i + 3.0·j

The magnitude of the resultant velocity vector, [tex]\left | R \right |[/tex] = √(5.0² + 3.0²) =√34 ≈ 5.83

The magnitude of the resultant velocity vector,  of the fish,  [tex]\left | R \right |[/tex]  ≈ 5.83 m/s

The direction of the resultant velocity of the fish, θ = arctan(3.0/5.0) ≈ 30.93°

Therefore, The direction of the resultant velocity vector of the fish, θ ≈ 30.93° relative to the direction of the river

b. The given parameters of the surfer and the wave are;

The speed with which the surfer is travelling, v₁ = 1.0 m/s

The speed of the wave travelling across, v₂ = 6.0 m/s

Therefore, in vector form, we have;

v₁ = 1.0·j

v₂ = 6.0·i

The resultant velocity, R = v₁ + v₂ = 1.0·i + 6.0·j

∴ R = 1.0·i + 6.0·j

The magnitude of the resultant velocity of the surfer, [tex]\left | R \right |[/tex] = √(1.0² + 6.0²) =√37 ≈ 6.083

The magnitude of the resultant velocity vector of the surfer, [tex]\left | R \right |[/tex]  ≈ 6.083 m/s

The direction of the resultant velocity of the surfer, θ = arctan(1.0/6.0) ≈ 9.46°

Therefore, The direction of the resultant velocity vector of the surfer, θ ≈ 9.46° relative to the direction of the wave

Answer:

P = r g h   where r here is the density m / V and then P is the pressre.

W (weight) = m g

m = 10 N / 9.8 m / s^2 = 1.02 kg

r (density) = m / V = 1.02 kg / 1000 cm^3 = .00102 kg/cm^3

P = .00102 kg / cm3 * 9.8 m/s^2 * 10 cm

P = .1 kg m / (s^2 cm^2)

Since 1  N = kg m / s^2    then P = .1 N / cm^2

More simply P = F / A = 10 N / 100 cm^2 = .1 N / cm^2

Answer:

The net force is 20 N and the acceleration of the block is [tex]5\ m/s^2[/tex]

Explanation:

Given that,

Mass of the block, m = 4 kg

Force in right side = 30 N

Force in left side = 10 N

We need to find the net force and the acceleration of the block.

Net force = Right force - left force (as both are opposite to each other)

= 30 N - 10 N

= 20 N

Formula for net force,

F = ma

a is acceleration

[tex]a=\dfrac{F}{m}\\\\a=\dfrac{20\ N}{4\ kg}\\\\a=5\ m/s^2[/tex]

Hence, the net force is 20 N and acceleration of the block is [tex]5\ m/s^2[/tex].