Describe when an object is said to be speeding up on a velocity versus time diagram.

Answer: a. air

Explanation:

Generally, the lower the density of the material, the better insulator the material is: this is because in materials with very low density, particles are very spread apart, so they cannot collide with each other, and so the vibrations of the particles (which determine how hot a substance is) cannot be transmitted very efficiently.

In the options listed in this problem, air is the material with lowest density, therefore it is the best thermal insulator among them.

Answer:

A. Air

Explanation:

It is correct in Ареx.

The electromagnetic force that acts on the protons in the nucleus of an atom is stronger than the strong nuclear force that acts on the same nucleus.

The current flows in the conductor, when a conductor is placed in a magnetic field. The magnetic field and the current both produce the magnetic force in that conductor. This force is known as the electromagnetic force.

The nuclear force is the force between the two nuclei. They both have positive charge. The force between them is weaker than the electromagnetic force which is the attractive force.

Thus, the electromagnetic force that acts on the protons in the nucleus of an atom is stronger than the strong nuclear force that acts on the same nucleus.

Learn more about electromagnetic force.

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Answer:

stronger than

Explanation:

took the mcq exam

Answer: D. 5cm

Explanation:

Given the following :

Focal length (f) = - 6.0 cm

Height of object = 15.0cm

Distance of object from mirror (u) = 12.0cm

Height of image produced by the mirror =?

Firstly, we calculate the distance of the image from the mirror.

Using the mirror formula

1/f = 1/u + 1/v

1/v = 1/f - 1/u

1/v = 1/-6 - 1/12

1/v = - 1/6 - 1/12

1/v = (- 2 - 1) / 12

1/v = - 3 / 12

v = 12 / - 3

v = - 4

Using the relation :

(Image height / object height) = (- image distance / object distance)

Image height / 15 = - (-4) / 12

Image height / 15 = 4 / 12

Image height = (15 × 4) / 12

Image height = 60 / 12

Image height = 5cm

Answer:

D. 5 cm

Explanation:got it right

Answer:

- 0.0466666667

Explanation:

We are told in the question above that:

A camera lens focuses on an object 75.0 cm from the lens. The image forms 3.50 cm behind the lens.

The formula for Magnification of an image = - image distance / object distance

Image distance = 3.50 cm

Object distance = 75 cm

Magnification = - 3.5/75

= -0.0466666667

= Approximately = -0.0467

Therefore, the magnification of the image is -0.0467

Answer:

0.557

Explanation:

That's the answer to a similar problem that asks us to solve for how tall the image is.

if it's 12.4 cm tall

correct for Acellus

This one:

A camera lens focuses on an image 78.0 cm from the lens

The image is 3.5 cm behind the lens

If it's 12.4 cm tall, how tall is the image

hope it helps

Answer:

A velocity time graph shows the change of velocity of an object with respect ot time. If the slope of the graph is increasing in the postive region, it means that the velocity is changing, if the slope is decreasing, it means the the velocity is decreasing, but the object is moving in the same direction (positve direction).

If this slope intersects the graph at x-axis, it means that the body has 0 velocity and has become still. After that, if the line enters in the negative region, it means that its velocity is started to increases again, but the body is movinging in the opposite direction (negative direction)

Answer:

A. Surface runoff from roads, sidewalks, and roofs

C. Wilderness areas.  will mostly likely not affect the health of watershed

Explanation:

Options A and C are not really harmful to the health of watershed, but chemicals used on farmlands and overflow from combined sewer systems can contaminate watershed adversely, which can be a major cause of the cholera outbreak (a water borne disease)

Answer:

B. Weight of the atmosphere above the surface.

Explanation:

The pressure that the atmosphere of the earth exerts is termed to be the atmospheric pressure. This pressure is applied on the surface of the air because of the gravitational pull. With the increase in altitude, the atmospheric pressure decreases. The atmospheric weight pushes itself downwards because of the gravity, this creates the pressure. The factor that causes atmospheric pressure is the 'Weight of the atmosphere above the surface.'

Answer:

A.) 1.3 seconds

B.) 0.42 m

Explanation:

A.) You are given the angle of projection to be 40 degrees and initial velocity of 20m/s. 

At vertical component

U = Usin 40 that is,

U = 20sin40

Using the first equation of motion under gravity

V = U - gt

Let V = 0

0 = UsinØ - gt

gt = UsinØ

t = UsinØ/g

Where U = 20 m/s

Ø = 40 degree

g = 9.8 m/s^2

Substitutes all the parameters into the formula

t = 20sin40/9.8

t = 1.3 seconds

Total time of flight T = 2t

T = 2 × 1.3 = 2.6 s

B.) To calculate the maximum height,

You will use the formula

V^2 = U^2 - 2gH

At maximum height, V = 0

2gH = Usin^2Ø

H = Usin^2Ø/ 2g

Substitutes all the parameters into the formula

H = 20 sin^2(40) ÷ 2(9.8)

H = 8.2635/19.6

H = 0.42 m

Answer:

a) What is the wave speed of a wave that has a frequency of 50 Hz and a wavelength of 0.10 m?

5m/s

b) What is the frequency of a wave that has a wave speed of 20 m/s and a wavelength of 0.50 m?

40Hz

Explanation:

a) What is the wave speed of a wave that has a frequency of 50 Hz and a wavelength of 0.10 m?

Wave speed(v) = Frequency(f) × Wavelength (λ)

= 50Hz × 0.10m

=5m/s

b) What is the frequency of a wave that has a wave speed of 20 m/s and a wavelength of 0.50 m?

The formula for Frequency when given wave speed and wave length = Wave speed/ wave length

f = v/λ

Frequency = 20m/s ÷ 0.50m

Frequency = 40Hz

Answer:

40 Hz

Explanation:

Answer:

After 1 second: 3

After 3 seconds: 9

After 5 seconds: 15

Explanation:

You just multiply the time and velocity.

1 x 3 = 3, 3 x 3 = 9, etc.

Answer:

C.) The bicycle is not in motion.

Explanation:

Answer:

4.5 × 10³

Explanation:

F=ma

F = 100*10 × 4.5

F = 4.5 × 10³

Answer:

400 J

Explanation:

Given:

Δy = 4.00 m

v₀ = 0 m/s

a = 5.00 m/s²

Find: v²

v² = v₀² + 2aΔy

v² = (0 m/s)² + 2 (5.00 m/s²) (4.00 m)

v² = 40.0 m²/s²

Find KE:

KE = ½ mv²

KE = ½ (20.0 kg) (40.0 m²/s²)

KE = 400 J

The kinetic energy of the object is the energy is that energy which possesses due to the its motion. It is the work needed to accelerate a body of a given mass from rest to its stated velocity .

Kinetic energy (KE) = 1/2 *m* v^2

mass = 20 kg (given )

accelerates = a = 5  m/s^2

to find = v ?

u = 0

using newton's kinematics equation  

v^2 - u^2 = 2as

v^2 - 0 = 2 * (5) * (4)

v^2 =  40

v = [tex]\sqrt{40}[/tex] m/s

Kinetic energy (KE) = 1/2 *m* v^2

                                =  1/2 * (20 kg) * 40 m/s

                                = 400 J

The kinetic energy (in J) of the crate when it is 4.0 m above the floor will be 400 J

learn more about  kinetic energy

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Answer:

23 N

Explanation:

By using the diagram above

[tex] \tan(30) = \frac{x}{40} [/tex]

By cross multiplying

[tex]x = \tan(30) \times 40[/tex]

[tex]x = 0.577 \times 40[/tex]

[tex]x = 0.577 \times 40[/tex]

[tex] x = 23.08[/tex]

[tex]approximately \: 23 [/tex]

Human impact the environment in positive and negative ways.Cutting down trees and littering have a negative effect on animals and plants. Protecting endangered species and cleaning lakes and seas has a positive effect on the environment.

Answer:

Friction

Explanation:

Friction is the force that is created when two objects rub against each other. All objects are rough, even though it might not appear that way, on the microscopic scale. These little grooves and ridges get stuck against each other when two objects are moved against each other, and they slow down motion. If there is no friction between a train and its tracks, then it can continue to accelerate without slowing down. Hope this helps!

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Actually Welcome to the Concept of the Optical Devices.

Now basically here the devices that can spread light over apart are the CONCAVE LENS and Convex mirror.

so the Answer is

C. B and D

The optical devices that spread light apart is B and D.

Optical devices are implements or instruments that process,analyses light waves and interprete it in order to enhance an image for visibility and determine the features of such image.

Therefore, The optical devices that spread light apart is B and D.

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Answer:

1.) 30m/s

2) 5m/s

3) 40Hz

4) 400Hz

5) 300Hz

6) 0.77m

7) 0.386m

8) 0.625m

9) 100m/s

10) 50m/s

Explanation:

The speed of a wave (V) equals :

V = fλ ; where f = frequency, λ = wavelength

1.) f = 100Hz, λ = 0.30m

v = 100 * 0.30 = 30m/s

2) f = 50Hz λ = 0.10m

v = 50 × 0.10 = 5m/s

3) v = 20m/s, λ= 0.5m

f = v / λ

f = 20 / 0.5 = 40Hz

4) v = 80m/s, λ= 0.2m

f = 80/0.2 = 400Hz

5) v = 120m/s, λ = 0.4m

f = 120 / 0.4 = 300Hz

6) v = 340m/s, f = 440Hz

λ = v / f ; 340 / 440 = 0.77m

7) v = 340m/s, f = 880Hz

λ = 340 / 880 = 0.386m

8) v = 250m/s, f = 400

λ = 250 / 400 = 0.625m

9) f = 50Hz, λ = 2m

v = 50 × 2 = 100m/s

10) f = 100Hz, λ = 0.5m

v = 100 × 0.5 = 50m/s

Answer:

At which point does the planet have the least gravitational force acting on it?

Explanation:

In an elliptical orbit, when a planet is at its furthest point from the Sun, it is under the least amount of gravity, meaning that the force of gravity is strongest when it is closest.

Answer:

Point A

Explanation:

Recall that gravitational force is inversely proportional to the square of the distance between the 2 objects.

This means that the farther away the objects are from each other, the lesser their gravitational interaction will be.

In this case we can see that Point A is furthest away from the star, hence this will be the location with the least gravitational force from the star.

Answer:

the answer is D. you have to go 3 miles to the east and then subtract the distance that the fire truck traveled to the the west.

Answer: D. 1.8 miles east

Explanation:

(Each "→" or "←" = .2 miles)

3 miles east:                →→→→→ →→→→→ →→→→→

minus 1.2 miles west:                       ← ←←←←←

3 - 1.2 = 1.8 miles east: →→→→→ →→→→

Electromagnetic fields are a combination of invisible electric and magnetic fields of force.

Electromagnetic waves  is a way or path to represent electromagnetic field

When conductor comes in an Electromagnetic field the electromagnetic waves exerts a force on it called  electromagnetic force

Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field.

Electromagnetic fields are a combination of invisible electric and magnetic fields of force.

Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. It is a way or path to represent electromagnetic field

When a conductor is placed in a magnetic field and current flows in the conductor, the magnetic field and the current interact each other to produce force. The force is called "Electromagnetic force". When conductor comes in an Electromagnetic field the  electromagnetic waves exerts a force on it called  electromagnetic force

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Answer:

i think option c is correct answer.

"Fun", "exciting", and "like" cannot be scientifically tested. They're perceived differently by different people, and they may even be perceived differently by the same person on different days.

Option-C is the only testable question on this list.

Answer:

The acceleration of the car at the instant when t=3s is found by taking the gradient of the tangent at the point t=3.

The tangent are those dotted lines sloping upwards in the graph.

Tangent: A straight line that touches the curve and does not intersect it.

The reason why they wrote instantaneous is because the acceleration (or gradient of graph) is not constant throughout hence it is just at the moment when t=3s.

Gradient is used to find the acceleration of a speed time graph.

Answer:

1) Mass of the string = 0.0267kg

Explanation:

1) In the above question, we are given:

Length of guitar string = 60cm

Wave speed = 30.0m/s

Tension = 50N

9.81 N = 1 kg

50N = 50/9.81

= 5.10kg

We have the formula

v = √(F/μ)

Where F = the tension in the string in newtons,

v = the wave speed in m/s

μ = the mass per unit length of the string in kg/m

The formula for μ is derived as

v = √(F/μ)

Square both sides

v² = [√(F/μ)]²

v² = F/μ

μ = F/v²

From the question,

μ = 40/ 30.0²

μ = 0.044kg/m

To calculate the mass of the string we use the formula

μ = Mt / Lt = total mass/total length.

Total length = 60cm

In meters = 0.60m

0.044kg/m = Mt/ 0.60m

Mt = 0.0266666667kg

Mass of the string = Approximately 0.0267kg

2)

Answer:

Density (D) = 0.18014184397163 kg/m^3

Steps:

D =  m  /  V  

D= 0.00254 kg / 0.0141 M^3

D= 0.18014184397163 kg/m^3

Explanation:

Use this calculator for help and make sure to change the units on the right side. (can't use links in brainly but look up "Density Calculator calculator . net)

Answer:

In general, the LONGER the string or air column of a musical instrument is, the more harmonics are generated.

Answer:

See explanation

Explanation:

An element is a substance that cannot be chemically converted to another substance or broken down chemically into other substances.

Elements are represented by symbols. The symbol of an element may be the first one or two letters from its English or Latin name. For instance, the symbol of nitrogen is N. This symbol was derived from the first letter of its English name. The symbol for sodium is Na. This was derived from the first two letters of its Latin name, Natrium.

The periodic table is divided into horizontal rows called periods and vertical columns called groups. All members of the same period have the same number of electron shells while all members of the same group have the same number of valence electrons.

Metals are found towards the left hand side of the periodic table while non metals are found towards the right hand side of the periodic table. Metals looses electrons easily while nonmetals accepts electrons easily. Metals are good conductors of heat and electricity while non metals are poor conductors of heat and electricity.Metalloids have properties intermediate between those of metals and non metals and are found at the boarder line between metals and non metals in the periodic table. Metalloids include; silicon, boron, germanium, etc. The electrical conductivity of metalloids increases with temperature while the electrical conductivity of metals decreases with temperature.

Answer:

Isothermal process = Temperature is constant

Explanation:

Answer:

A, C, & D

Explanation:

A. ΔU = 0

C. Temperature is constant

D. W = Q

a p e .x approved right answers

Answer:

E = 77532.42N/C

Explanation:

In order to find the magnitude of the electric field for a point that is in between the inner radius and outer radius, you take into account the Gauss' law for the electric flux trough a spherical surface with radius r:

[tex]\int E\cdot dS=\frac{Q}{\epsilon_o}[/tex]       (1)

Q: net charge of the hollow sphere = 1.9*10-6C

ε0: dielectric permittivity of vacuum = 8.85*10^-12 C^2/Nm^2

Furthermore, you have that the net charge contained in a sphere of radius r is:

[tex]Q=\rho V=\rho \frac{4\pi (r^3-r_1^3)}{3}[/tex]      (2)

with the charge density is:

[tex]\rho=\frac{Q}{\frac{4}{3}\pi(r_2^3-r_1^3)}[/tex]          (3)

r2: outer radius = 0.31m

r1: inner radius = 0.105m

The electric field trough the Gaussian surface is parallel to the normal to the surface, the, you have in the integral of the equation (1):

[tex]\int E\cdot dS=E(4\pi r^2)[/tex]      (4)

where you have used the expression for a surface of a sphere.

Next, you replace the expressions of equations (2), (3) and (4) in the equation (1) and solve for E:

[tex]E(4\pi r^2)=\frac{1}{\epsilon_o}\frac{Q}{\frac{4}{3}\pi(r_2^3-r_1^3)}(\frac{4\pi (r^3-r_1^3)}{3})\\\\E=\frac{1}{\epsilon_o}\frac{Q(r^3-r_1^3)}{4\pi r^2(r_2^3-r_1^3)}[/tex]

you replace the values of all parameters, and with r = 0.17m

[tex]E=\frac{(1.6*10^{-6}C)((0.17m)^3-(0.105m)^3)}{4\pi(8.85*10^{-12}C^2/Nm^2)(0.17m)^2((0.31m)^3-(0.105m)^3)}\\\\E=77532.42\frac{N}{C}[/tex]

The magnitude of the electric field at a distance r=0.17m to the center of the hollow sphere is 77532.42N/C