can a physical quantity have unit but is dimensionless?​

Answers

Answer 1

Answer:

i might be wrong here, but i`m pretty sure dimensionless things are infinite, and infinity can not be defined by a single quantity.

for example, since space is constantly expanding, it never has and never will have an actual measurement of any sort.


Related Questions

Is the following research description experimental, descriptive, or applied?

Jenna does a study to see if sugar and hyperactive behavior in children are related.

Answers

Answer:

It is experimental. She will testing or investigating on children. So yeah, it is experimental

A shot putter puts the shot at a velocity of 14 m/s (assume this represents a constant horizontal
velocity). The shot is in the air for 1.4 seconds. How far did the shot travel?

Answers

S = (v-u)t/2

s = (14)1.4/2

s = 9.8m

The range of the shot will be "19.6 m". A complete solution is provided below.

The given values in the question are:

Horizontal velocity,

v = 14 m/s

Time,

t = 1.4 sec

Now,

The Range will be:

= [tex]Velocity\times Time[/tex]

By putting the given values, we get

= [tex]14\times 1.4[/tex]

= [tex]19.6 \ m[/tex]

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A car traveling at 7.5 m/s accelerates 3.8
m/s2 to reach a speed of 14.0 m/s.
How long does it take for this acceleration
to occur?

Answers

Answer:

1.71s

Explanation:

Acceleration = the change in velocity / the change in time

Or I can write it as

a = V2 - v1

- - - -----

t

V1 (initial velocity) = 7.5m/s

V2 ( final velocity) = 14.0m/s

a =3.8m/s^-2

Therefore

a= V2 - V1

- - - - - - - -

t

t = V2 - v1

- - - - - - -

a

t = 14 - 7.5

- - - - - -

3.8

t = 1.71s

calculate the valocity of water wave if the frequency is 400hz the wavelength is 6m and amplitude of the wave is 3.76cm

Answers

Explanation:

V = 400x6 = 2400m/s

V = 2400m/s

The velocity of a water wave if the frequency is 400hz the wavelength is 6m and the amplitude of the wave is 3.76cm will be 2400 m/s.

What is Wavelength?

It can be understood in terms of the distance between any two similar successive points across any wave for example wavelength can be calculated by measuring the distance between any two successive crests.

The velocity of water wave = Wavelength x Wave Frequency

                                             = 6 × 400 m/s

                                             =2400 m/s

Thus, The velocity of a water wave if the frequency is 400hz the wavelength is 6m comes out to be 2400 m/s.

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The electric field is generated by charge +Q. Which arrow represents the direction of the electric field at point P that is at distance of “r” from +Q? Magnitude of the E at the point P

Answers

Answer:

it is p

Explanation:

because it makes more sense

distinguish between basic and derived units

Answers

Answer:

Base units are defined units based on specific objects or events in the physical world. Derived units are defined by combining base units.

Base units are defined by a particular process of measuring a base quantity whereas derived units are defined as algebraic combinations of base units. For example, length is a base quantity in both SI and the English system, but the meter is a base unit in the SI system only.

A car travelling at a speed of 40 m/s slows to 10 m/s in 5 seconds. The acceleration of the car is

Answers

Answer:

[tex]\boxed {\boxed {\sf -6 \ m/s^2}}[/tex]

Explanation:

Acceleration is the change in velocity with respect to time. We are given the velocity and time, so we will use the following formula to find acceleration.

[tex]a= \frac {v_f-v_i}{t}[/tex]

The car slowed down, so the final velocity was 10 meters per second and the initial velocity was 40 meters per second. It slowed down in 5 seconds.

[tex]v_f[/tex]= 10 m/s[tex]v_i[/tex]= 40 m/st=5 s

Substitute these values into the formula.

[tex]a= \frac{ 10 \ m/s - 40 \ m/s}{5 \ s}[/tex]

Solve the numerator and subtract.

[tex]a= \frac{ -30 \ m/s}{5 \ s}[/tex]

Divide.

[tex]a= -6 \ m/s/s[/tex]

[tex]a= -6 m/s^2[/tex]

The acceleration of the car is -6 m/s² or -6 meters per second squared. The acceleration is negative because the car slowed down.

Why do scientists sometimes discuss the possibility of silicon as a basic element for life?
A. Silicon has an outer shell of electrons that is similar to carbon.
B. Silicon is similar in atomic mass to carbon.
C. Silicon has an inner shell of electrons that is similar to carbon.
D. Silicon is similar in abundance to carbon.

Answers

Answer:

Explanation:

None of the other answers matter but the right answer which A. Silicon has an outer shell of 4. Carbon can connect with 4 elements  because of its outer shell. CH4 is the simplest example. But C2H6 is also possible.

     H   H

H - C - C - H

     H   H

There are 4 connections to the outside world for the Carbon (C) on the left.

It has 3 hydrogens connected on to it and one of its connecting electrons goes with the other carbon on the right.

Silicon can do the same thing.

A rock is thrown downward from the top of a cliff with an initial speed of 20 m/s. If the rock hits the ground after 5.0 s, what is the height of the cliff? (Disregard air resistance. a =-g=-9.81 m/s2.)​
(i want step by step)

Answers

Answer

I hope it's helps you

10. What is a rule for determining the mass?

Answers

Answer:

Mass number is the sum of the protons and neutrons in the atomic nucleus.

The mass number (A) is the sum of the atomic number (Z), which is the number of protons, and the number of neutrons (N) in the atomic nucleus of an isotope of an element. A=Z+N

By adding together the number of protons and neutrons and multiplying by 1 amu

If mass of body is 10 kg then its weight on moon is:
Please help

Answers

Answer:

moon gravity is about one sixth of earth gravity

W = 10(9.8/6) = 16 N

The heating element of an electric oven is designed to produce 3.9 kW of heat when connected to a 240-V source. What must be the resistance of the element?5)A 120-V hair dryer has two settings: 950 W and 1400 W .a) Determine the resistance at 950 W setting.b) Determine the resistance at 1400 W setting.

Answers

The heating element of an electric oven is designed to produce 3.9 kW of heat when connected to a 240-V source. Then the resistance of the element is 14.7Ω

When A 120-V hair dryer has two settings: 950 W and 1400 W then the resistance at 950 W is 15.15Ω and at 1400 W is 10.28Ω.

What is Electric Power ?

The pace at which electrical energy is transmitted by an electric circuit is referred to as its power. The watt is the SI unit of power, equal to one joule per second. Watts, like other SI units, have standard prefixes: thousands, millions, and billions of watts are referred to as kilowatts, megawatts, and gigawatts, respectively.

It is a popular misperception that electric power is purchased and sold, whereas electrical energy is. Electricity, for example, is sold to users in kilowatt-hours (kilowatts multiplied by hours), because energy is defined as power multiplied by time.

In this problem,

Given,

Power P = 3.9 KW

Voltage V = 240 V

P = V²/R

3.9 × 10³ = 240²/R

R = 240²/3.9 × 10³

R = 14.7Ω

For hair dryer,

given,

P = 950 W or 1400 W

V = 120 V

P = V²/R

950 = 120²/R

R = 120²/950

R = 15.15Ω

P = V²/R

1400= 120²/R

R = 120²/1400

R = 10.28Ω

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3. The equation of motion of a SHM oscillator is x=0.5msin(2πf)t, where x is in meter and t is in seconds. If the position of the oscillator is at x=0.25m and t=0.25s . what is the frequency of the oscillator ?  ​

Answers

Answer:

f = 1/3 Hz

Explanation:

0.25 = 0.5 sin(2πf)0.25

0.5 = sin(0.5πf)

take arcsine of both sides in radians

0.52359 = 0.5πf

f = 0.52359 / 0.5π = 0.33333...

The frequency of the oscillator is 0.33 Hz.

We have an equation of SHM.

We have to identify the frequency of the oscillator.

What are the conditions for a motion to be Simple Harmonic ?

The conditions are -

The restoring force must be proportional to the displacement.The restoring force should act opposite to the direction of motion with no drag forces or friction.

According to the question, we have -

x = 0.5 sin(2πft)

Substituting the values -

0.25 = 0.5 sin(2πft)

sin(2πft) = 0.5

sin(2πft) = 1/2

sin(2πft) = sin(π/6)

2πft = π/6

2ft = 1/6

f = [tex]\frac{1}{12t}[/tex] = [tex]\frac{1}{12\times 0.25}[/tex] = 0.33 Hz

f = 0.33 Hz

Hence, the frequency of the oscillator is 0.33 Hz

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P= 2/3(N/V)1/2mv^2
Solve for v

Answers

your question:

P= 2/3(N/V)1/2mv^2 Solve for v

answer:

v=√2Vem

find the final velocity of the initial velocity of 8m/s with an acceleration of 7 m/s2 over 3 second interval​

Answers

Please find attached photograph for your answer. Hope it helps! Please do comment.

A mountain climber at the peak ha ___________ energy.

A.gravitational potential
B. Elastic potential
C.Kinetic

Answers

its Kinetic, hope this helps you

Object X is attracted to object Y. If object Y is negatively charged, what can you say about object X? (a) It is positively charged (b) It is negatively charged (c) It is electrically neutral (d) Object X may be positively charged, but it is possible it is also electrically neutral with an induced charge separation​

Answers

Answer:

a) Object X is positively charged

Explanation:

Unlike charges attract each other

Like charges repel each other

The object X will be positively charged through charging by conduction.

The given parameters:

Object Y = positively charge

A charge can be produced by conduction. This method of charge generation involves charging a neutral body by placing it in contact charged body.

When object X is placed in contact with object Y, which is negatively charged, the negative charges of object Y repels negative charges of object X. This leaves object X with excess protons, thereby becoming positively charged.

Thus, the object X will be positively charged through charging by conduction.

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Determining a formula for the change in surface area of a uniform solid sphere of radius r if it's Coefficient of linear expansion is a (assumed constants )and its temperature is changed by DT



Answers

Answer:

Explanation:

Area A = 4 pi R^2

lnA = ln(4 pi) + 2 ln R

dA/A = 2 dR/R = 2*(alpha)*dT

delta A = 2A*alpha*(delta T)

OR

A at T + deltaT

delta A = 4 pi (R + deltaR)^2 - A

= 4 pi R(1 + alpha*deltaT)^2 -A

= 4 pi R^2 *[1 + 2*alpha*deltaT +

(alpha*deltaT)^2] - A

= 2*A*alpha*deltaT + A*(alpha*deltaT)^2

(Ignore the second term in deltaT^2)

11. Approximatrly how many kelvins are equal to 60°F?
a. 439
b. 212
c. 902
d. 289

Answers

D, that’s the answer

Which definition best explains science? (1 point)

Answers

Answer: c is the correct answer

Explanation:

Option C is the correct answer.

Definition of Science: A way of discovering and knowing about the world.

Science

Science can be defined as the knowledge and understanding of the natural and social world following a systematic methodology based on evidence.

The scientific methodology includes objective observation, measurement and data evidence.

Science is a system of observations and experiments used to gain knowledge about how the universe works. Observations describe how and why things happen the way they do. Experiments are investigations used to explain how the world works.

Hence option C represents the best definition.

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3. Write "T" for true statements and "F" for false statements:
a. Protozoa are multi cellular animals.
b. Vacuoles are larger in plant cell.
c. Body of mammals is covered with feathers.
d. There is a pair of antenna on the head of a cockroach.
e. Birds have hollow and air filled bones.

Answers

Answer:

F

T

F

T

T

Explanation:

Thanks for this oppurtunity

4. A car slows down from 36 km.h to stop in 25 s. 4.1 Define "acceleration”. 4.2 Convert 36 km:h-' to m's-1.​

Answers

1. Acceleration is the change in velocity of an object per unit time.

2. 36 km/h

= 36000 m/60×60 s

= 36000 m/3600 s

= 10 m/s

Hope it helps! Please do comment

If the solar system were the size of your campus, how far away would the nearest star be?
About a mile away.
About 100 miles away.
About 2,000 miles away.
An infinite distance away.

Answers

The solar system is very large with the boundaries located around the Orth cloud 100,000 Astronomical Units away

The correct option for, the distance to the nearest star if the solar system were the size of a campus is the option;

About a mile away

The reason the above selection is correct is as follows:

The nearest star to the solar system is Proxima CentauriThe distance of the nearest star to the solar system from Earth is 40,208,000,000,000 kilometers awayThe area of the solar system is about (π × (10⁵ × 149.6 × 10⁶)²) km²The size of one of the largest campus can be taken as 27,000 acres = 109.2651 km²

The ratio of the area of the solar system to the area of a campus = (π × (10⁵ × 149.6 × 10⁶)²)/(109.2651) = 6.4347487 × 10²⁴

Therefore, the linear scale factor ≈ √(6.4347487 × 10²⁴) ≈ 2.5366807 × 10¹²

Therefore, the corresponding distance to the distance of the nearest star to the solar system, X is given as follows;

X = (40,208,000,000,000 km)/(2.5366807 × 10¹²) ≈ 15.85 km ≈ 9.85 miles

Given that compared with the largest campus the distance is at most approximately 9.85 mile, if the solar system is taken to be a much smaller campus, the distance of the closest star Proxima Centauri will be about a mile away

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N2 + 3H2 + 2NH3
What type of reaction is this

Answers

Answer:It is a combination reaction; nitrogen and hydrogen combine to form ammonia

Explanation:

This is the reaction that is used to make ammonia from hydrogen and nitrogen. In this reaction, only one product is formed. Therefore, this reaction is known as a combination reaction.

what iz kinematics ???​

Answers

Answer:

the branch of mechanics concerned with the motion of objects without reference to the forces which cause the motion

Explanation:

A vehicle starts from rest and travels 50 m in 5 s. What is its acceleration?

Answers

Well it depends 60 could be the acceleration

Being willing to sincerely apologize for mistakes errors and blunders goes a long way toward

Answers

Answer:

All of the above ! Hope this helps! ♥

Explanation:

Being willing to sincerely apologize for mistakes, errors, and blunders goes a long way toward nurturing relationships with customers and retaining customers. Option (c) is correct.

What do you mean by Apology?

Apology means to express regret for having done something that has caused another person problems or misery

Sincere apology aids in mending ties with those you've harmed. That may include coworkers, customers, friends, or family.

You can start a conversation with the other person by owning up to your error. You can then consider your actions and accept responsibility for them. Also, they can deal with their emotions, regain their composure, and refrain from taking responsibility for what transpired.

You may improve your behavior going forward, keep your dignity, and regain people's respect by apologizing.

Therefore, Option (c) is correct.

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Your question is incomplete, most probably the complete question will be;

Being willing to sincerely apologize for mistakes, errors, and blunders goes a long way toward:

Helping to learn from mistakes

Helping nurture the relationship with customers

Retaining customers

All of the above

The microwave portion of the spectrum has wavelengths ranging from 1 mm to 1 m. Find the corresponding frequencies. g

Answers

Answer:

f = c / y      where y is the wavelength

f1 = 3 *10E8 m/s / .001 m = 3 * 10E11 / s

f2 = 3 * 10E8 m/s / 1 m = 3 * 10E8 / s

Explain how global warming is a result of fossil fuel consumption in recent years

Answers

hi <3

fossil fuel consumption has increased in recent years due to many countries industrializing and becoming more advanced. burning fossil fuels releases greenhouse gases which trap radiation within the atmosphere and heat up the planet

hope this helps :)

You are taking a turn at 30.0 m/s on a ramp of radius 25.0 m. What is your acceleration?

Answers

Acceleration = v^2 / r

Acceleration = 30^2/25

Acceleration = 900/25

Acceleration = 36 m/s^2

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