Which of the following statements DOES NOT explicitly describe a transfer of energy,
A. A ball dropped from a height hits the ground with a high speed.
B. The collisions produced in a nuclear reaction heat up the surroundings.
C. A plane increases its air speed from 150 mi/hr to 200 mi/hr.
D.The electricity from the power socket causes the fan to turn

Answer:

[tex]I=0.5 \:A[/tex]  is the correct answer.

Explanation:

Using the ohm's law, we have:

[tex]V=IR\\\\I=\frac{V}{R}=\frac{3}{6}\\\\I=0.5 \:A[/tex]

Best Regards!

Answer: mammals may be relatively better at solving problems than birds.

Answer: A

Explanation:

mammals may be relatively better at solving problems than birds

Explanation:

The angle of incidence is always smaller than the angle of refraction

Answer:

  500 m

Explanation:

The applicable relation is ...

  wavelength = speed/frequency

  wavelength = (5000 m/s)/(10 cycles/s) = 500 m/cycle

The wavelength is 500 meters.

Answer:

Constant and positive constant

Explanation:

The object move with the same velocity at the same interval

Answers:

In short, the boxes you check will be box 1, box 3, box 6.

================================================

Explanation:

It's not stated, but I'm assuming that A,B,C are three dimensional vectors

I'll go through each answer choice to say whether it's valid or not.

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Choice 1

A x B is some vector

(A x B) x C is some other vector. Cross products produce vectors as outputs, when the two inputs are both 3D vectors. The output vector is the same dimension as the inputs.

Overall, the expression (A x B) x C is valid.

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Choice 2

A dot B is a scalar

(A dot B)C is some vector

A dot (B x C) is a scalar

We cannot add a scalar to a vector. The given expression (A dot B)C + A dot (B x C) is not valid

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Choice 3

B x C is a vector

B dot (B x C) is scalar

A[ B dot (B x C) ] is a vector in the form kA with k as a scalar.

The overall expression is valid

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Choice 4

B x C is a vector

B(B x C) is not valid. We need to use a dot or cross symbol between the B and (B x C).

If we had kB with k as a scalar, then we don't need a symbol between them.

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Choice 5

A dot B is a scalar

Scalars are not allowed when it comes to cross products, so (A dot B) crossed with anything is not valid.

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Choice 6

B x C is some vector

A dot (B x C) results in a scalar

The expression is valid

Answer:

0

Explanation:

Displacement is a vector from initial to final point. Because initial and final point are the same, so displacement is 0.

Answer:

you can see them in the night

Explanation:

also in the day they are there but you can't see it

Answer:

Hey!

Your answer is Circumpolar Stars!

Explanation:

These are stars which appear to revolve (spin/turn) around the polar axis (N and S) and do not set below the horizon.

Hope this helps!

Wood is a natural insulator due to air pockets within its cellular structure, which means that it is 15 times better than masonry, 400 times better than steel, and 1,770 times better than aluminum. In addition, lightweight wood framing methods allow easy installation of additional fibre or foil insulation. i hope this is better

Answer:

  The acceleration would double

Explanation:

Assuming the same box and spring, the maximum acceleration is proportional to amplitude. When the amplitude doubles, the acceleration would double.

__

A spring is generally considered to have a linear force vs. distance characteristic. Hence, doubling the distance doubles the force. The acceleration is proportional to the force.

Answer:

C: Valence electrons are transferred from a metal to a nonmetal

Explanation:

In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.

hope this was helpful :)

Answer:

Deposition

Explanation:

Answer:

deposition

Explanation:

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Answer:

Hey!

I did this question and have the answers/potential things you can write!

XD

Explanation:

Here!

structure

•alpha particle consists of a helium nucleus

•alpha particle consists of 2 protons and 2 neutrons

•a beta particle is an electron

•a beta particle comes from the nucleus  

penetration

•alpha particles are very poorly penetrating

•alpha particles can penetrate a few cm in air

•alpha particles are absorbed by skin

•alpha particles are absorbed by thin paper

•beta particles can penetrate several metres of air

•beta particles can pass through thin metal plate / foil

•beta particles can travel further than alpha particles in air

•beta particles can travel further than alpha particles in materials eg metals  

deflection

•alpha particles and beta particles are deflected in opposite directions in an electric field

•beta particles are deflected more than alpha particles

•alpha particles have a greater charge than beta particles but beta particles have much less mass or beta particles have a greater specific charge than alpha particles

Hope this helps!

Sorry if it's a bit too long!

Answer:

acceleration = 45 m/s²

Time = 20 seconds

Explanation:

We are given;

Distance; s = 90m

Final velocity;v = 90 m/s

Since shot from rest, initial velocity;u = 0 m/s

So, to find the acceleration, we can use Newton's 2nd law of motion which is;

v² = u² + 2as

Where a is acceleration

Plugging in the values;

90² = 0² + 2a(90)

8100 = 180a

a = 8100/180

a = 45 m/s²

Now, for the time, we will use Newton's 1st law of motion which is;

v = u + at

Where t is time;

So;

90 = 0 + 4.5t

90 = 4.5t

t = 90/4.5

t = 20 seconds

Answer:

Torque by electric dipole = pEcos thita

Answer:

Into the page (negative z-axis)

Explanation:

We have a charge moving towards the left (as it is an electron we reverse the direction.)

We have an output motion downwards.

We know that the magnetic field would be in [tex]90^o[/tex] to both direction of charge and motion.

Using Fleming's Left Hand Rule.

Thumb for direction of thrust. (Downwards)

Field for direction of magnetic field (unknown)

Middle finger for direction of current (To the left)

We can determine that the magnetic field would be going into the negative z axis.

The true of an image produced by this mirror will be 2.5 times smaller and virtual. Option C is correct.

When light beams from an object reflect off a mirror, they intersect with the picture of that thing called an image. Real and virtual images are the two sorts of images.

The ratio of xi to xo for a certain mirror is 2.5;

[tex]\rm \frac{x_i}{x_0} =2.5 \\\ x_i=2.5 x_0[/tex]

Where,

[tex]\rm x_0[/tex] is the true of an image produced by this mirror.

The true of an image produced by this mirror will be 2.5 times smaller and virtual.

Hence,option C is correct.

To learn more about the image refer to the link;

https://brainly.com/question/25029470

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Answer:

( About ) 1.1 cm / s

Explanation:

We know that the time it takes the clock's second hand to move is 60 seconds. Respectively the radius of this clock is given to be 10.5 centimeters.

_______________________________________________________

Let us apply the formula speed = distance traveled / time. Here the " distance traveled " is the circumference of the clock, or 2πr - where we can pose π as 3.14. In other words, Speed = 2πr / time. Substitute known values to solve for the Speed,

S = 2 * 3.14 * 10.5 / 60,

Speed = ( About ) 1.1 cm / s

Hope that helps!

Answer:

1960 J

Explanation:

EK = (18 kg + 62 kg)[tex](7.0 m/s)^{2}[/tex]/2 = 1960 J

Answer:

The correct option is;

B. Throughout all of history

Explanation:

A body of knowledge comprises of a given collection of concepts, activities and terms that represents a professional discipline that is outlined by the associated scholarly society, therefore, scientific knowledge, being comprised of very diverse field of knowledge, with different approaches and  changing understanding is taking as a process of learning about the universe data collection, experimenting analysis and communication with a theme of systems, equilibrium, models and constant change which makes the basis of the body of scientific knowledge to be throughout all of history.

Answer:

i = -12.7 cm; h =  5.07 cm

Explanation:

1. Find the focal length

The focal length of a concave spherical mirror is half of its radius of curvature.

f = ½r = ½ × 34.0 cm = 17.0 cm

2. Find the image distance

A convex mirror produces a virtual image behind the mirror, so the image distance is negative.

[tex]\begin{array}{rcl}\dfrac{1}{o} + \dfrac{1 }{i} & = & \dfrac{1}{f}\\\\\dfrac{1}{50.0} + \dfrac{1 }{i} & = & \dfrac{1}{-17.0}\\\\\dfrac{1}{i} & = & \dfrac{1}{-17.0} - \dfrac{1}{50.0}\\\\& = & \dfrac{50.0 - (-17.0)}{500\times(-17.0)}\\\\& = & \dfrac{67.0}{-850}\\\\i & = & \dfrac{-850}{67.0}\\\\& = & \textbf{-12.7 cm}\\\end{array}[/tex]

3. Find the image size

[tex]\begin{array}{rcl}\\\\\dfrac{h_{\text{i}}}{ h_{\text{o}}} & = & -\dfrac{i}{o} \\\\\dfrac{h_{\text{i}}}{ 20.0} & = & -\dfrac{-12.7}{50.0} \\\\h_{\text{i}} & = & 20.0 \times \dfrac{12.7}{50.0}\\\\& = & \textbf{5.07 cm}\\\end{array}[/tex]

Answer:

+20 yards

Explanation:

Given:

North = 50 yards

East = 20 yards

South = 50 yards

Required

Calculate the magnitude of displacement

Displacement is a vector quantity and it is a measure of distance taken and the direction of the distance.

Take up directions as positive and down directions as negative.

Similarly, we'll take right direction as positive and left direction as negative.

We understand that;

North is upwards; so, the displacement is +50 yards

East is rightwards; so, the displacement is +20 yards

South is downwards; so the displacement is -50 yards

Hence, her total displacement is

Displacement = +50 yards + 20 yards - 50 yards

Displacement = +20 yards

Hence, Sara's displacement is +20 yards

Answer:

26b) 66.7%

27) 500 N

Explanation:

26.a) In a two pulley system, the load is attached to one of the pulleys.  The other pulley is attached to a fixed surface, as well as one end of the rope.  The other end of the rope goes around moving pulley, then around the fixed pulley.

26.b) Mechanical advantage is the ratio between the forces:

MA = load force / effort force

Efficiency is the ratio between the work:

e = work done on load / work done by effort

Work is force times distance.

e = (F load × d load) / (F effort × d effort)

Rearranging:

e = (F load / F effort) × (d load / d effort)

e = MA × (d load / d effort)

In a two pulley system, the load moves half the distance of the effort.  So the efficiency is:

e = (4/3) × (1/2)

e = 2/3

e = 66.7%

27) In a three pulley system, the load moves a third of the distance of the effort.

e = (F load / F effort) × (d load / d effort)

0.40 = (600 N / F) × (1/3)

F = 500 N

Answer:

The maximum height that a cannonball fired at 420 m/s at a 53.0° angles is 5740.48m.

hmax = 5740.48 m

Explanation:

This is an example of parabolic launch. A cannonball is fired on flat ground at 420 m/s at a 53.0° angle and we have to calculate the maximum height that it reach.

V₀ = 420m/s and θ₀ = 53.0°

So, when the cannonball is fired it has horizontal and vertical components:

V₀ₓ = V₀ cos θ₀ = (420m/s)(cos 53°) = 252.76 m/s

V₀y = V₀ cos θ₀ = (420m/s)(cos 53°) = 335.43m/s

When the cannoball reach the maximum height the vertical velocity component is zero, that happens in a tₐ time:

Vy = V₀y - g tₐ = 0

tₐ = V₀y/g

tₐ = (335.43m/s)/(9.8m/s²) = 34.23s

Then, the maximum height is reached in the instant tₐ = 34.23s:

h = V₀y tₐ - 1/2g tₐ²

hmax = (335.43m/s)(34.23s)-1/2(9.8m/s²)(34.23s)²

hmax = 11481.77m - 5741.29m

hmax = 5740.48m

Answer:

Explanation:

In projectile,

Maximum height = [tex]\frac{u^{2}sin^{2} \theta }{2g}[/tex] and range = [tex]\frac{u^{2}sin2\theta }{g}[/tex]

u = velocity of the body

[tex]\theta[/tex] = angle of launch

g = acceleration due to gravity

If the range equals the maximum height in an ideal projectile launch on a horizontal plane, this means;

[tex]\frac{u^{2}sin^{2} \theta }{2g} = \frac{u^{2}sin2\theta }{g}[/tex]

since [tex]sin2\theta = 2sin\theta cos\theta[/tex]

[tex]\frac{u^{2}sin^{2} \theta }{2g} = \frac{u^{2}2sin\theta cos\theta }{g}\\\frac{sin\theta}{2} =2cos\theta \\sin\theta = 4cos\theta\\\frac{sin\theta}{cos\theta} = 4\\tan\theta = 4\\\theta = tan^{-1} \\4\theta = 75.9^{0}[/tex]

The angle at which the range equals the maximum height in an ideal projectile launch on a horizontal plane is approximately 76°

Answer:

Cloth:

It is an insulator since it can't let electricity pass through

Dry Wood:

It is an insulator and can't conduct electricity.

Tap Water:

It is a good conductor as it contains dissolved salts.

Glass:

It is an insulator since it can't let electricity pass through.

Answer:

They are the physical parts of a computer.

examples :monitor,keyboard,system unit and mouse.

Answer:

So the weight of the body is 700N

Explanation:

mass of the object=70kg

force of gravity=10N/kg

weight of the object=w-?

as we know that

weight=mass × force of gravity

weight=70kg × 10N/kg

WEIGHT OF THE BODY=700N

I HOPE IT WILL HELP YOU

GOOD LUCK FOR THE ASSIGNMENT

The correct answer is 700 N.

Object mass = 70 kg

Gravity = 10N / kg

Weight = Mass x Gravity

Weight = 70kg x 10N / kg

Weight = 700 N

Mass is more basic because it is a unique property of the object. Weight varies from place to place depending on the acceleration of gravity. If the mass on the earth is m = 10kg, the weight is W = mg = 10 x 10 = 100N.

The strength of the Earth's gravitational field is 10 Newtons (N / kg) per kilogram. This means that there is a force of 10 Newtons per kilogram on Earth. Mass is the amount of substance that makes up an object.

Learn more about gravitational strength here: https://brainly.com/question/25624188

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Answer:

80 meters

Explanation:

Answer:

So the distance covered is 80meters

Explanation:

Speed=72km/h=20m/s

Time=4seconds

Distance covered=?

As we know that

Speed=distance covered/time taken

Speed*time taken=distance covered

Putting values

Distance covered=20m/s*4s

Distance covered =80meters

I hope it will help you