Physics High School

Can someone help me with this please :(

Answers

Answer 1

Answer:

it should be iii) Upthrust exerted on P is more than the upthrust exerted on Q

Related Questions

Whoever is good at physics, can you help me with these questions?

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Answer:

i honestly do not know the awnser , im just setting up my brainly account

Answer:

Q)32) What is the unit of intensity of sound

Ans)Decibel

Q)33) Relate amplitude and distance to the intensity and loudness of sound

Ans)The average amount of energy passing through a unit area per unit of time in a specified direction is called the intensity of the wave. As the amplitude of the sound wave increases, the intensity of the sound increases. (i can't find the answer for distance and loudness i can't find it on g....o...o....g....l.....e and my textbook u will have to search it on ur own sorry)

Q)34) What is the pitch of sound

Pitch is the rise and fall of our voice when we speak. It is the characteristic of sound by which we can distinguish the sounds of the same loudness. Types: Pitch is generally of two types, high pitch and low pitch. High Pitch: The higher the frequency of the sound, the higher will be the pitch.

Q)35) How is pitch of sound related to its frequency of sound waves?

The sensation of a frequency is commonly referred to as the pitch of a sound. The pitch of the sound we hear depends on the frequency of the sound wave. A high frequency sound wave has a high pitch, and a low frequency sound has a low pitch.

Q)36) Define the Doppler effect?

The apparent change in the frequency of sound due to the relative motion between the source and the observer is called the Doppler effect.

Q)37) Explain why the doppler effect occurs

The Doppler effect, or Doppler shift, occurs when the movement of an observer relative to a source (or vice versa) causes a change in wavelength or frequency.

Sorry i can't find the last one i will try to search it afterwards

Neutrons are also known as____

neutrinos
photons
alpha particles
beta particles

Answers

Answer:

Beta Particles

Explanation:

a. How far does a 100-newton force have to move to do 1,000 joules
of work?
b. An electric hoist does 500 joules of work lifting a crate 2 meters. How
much force does the hoist use?
c. An athlete does one push-up. In the process, she moves half of her body
weight, 250 newtons, a distance of 20 centimeters. This distance is the
distance her center of gravity moves when she fully extends her arms. How
much work did she do after one push-up?
d. You decide to push on a brick wall with all your might for 5 minutes. You
push so hard that you begin to sweat. However, the wall does not move. If
you end up pushing with a force of 500 newtons, how much work did you
do?

Answers

Work done by a force is given as the product of force and the distance moved by the force.

What is work done?

Work done is the product of force and the distance moved by the the force.

Work done = Force × distance

Thus, distance required by the 100 N force is given as:

Distance = work done/force

Distance = 1000/100 = 10 m

Distance to be moved is 10 m.

Force applied = work done/ distance

Force applied by the hoist = 500/2

Force applied by the hoist = 250 N

Distance moved in one push-up = 25 cm = 0.25 m

Work done by the athlete after one push-up = 250 × 0.25 m

Work done by the athlete = 62.5 J

Distance moved by the force = 0 m

Work done = 500 × 0 = 0 N

Therefore, for work to be done, force has to move a distance.

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5. How much time does it take for a bird flying at a speed of 45 kilometers per hour to travel a
distance of 1800 kilometers

Answers

Answer:

[tex]40h[/tex]

Explanation:

Use the velocity formula to solve

[tex]v = \frac{d}{t}[/tex]

In this question, you are given velocity [tex]v = 45km/h[/tex], and you are given a distance, [tex]d = 1800km[/tex]. Time in this question is what you'll need to find.

Start by rearranging the velocity formula, to isolate for t.

[tex]v = \frac{d}{t}[/tex]

Start by multiplying both sides by t

[tex]v(t) = \frac{d}{t}(t)\\\\vt = d[/tex]

Then divide both sides by v.

[tex]vt\frac{1}{v} = d/v\\ \\t = \frac{d}{v}[/tex]

Now that you've isolated for time, sub in your values and calculate.

[tex]t = \frac{d}{v} = \frac{1800km}{45km/h} = 40 h[/tex]

Suppose that your car is stuck on ice. The wheels spin, but the car does not move. Your friend suggests that you let the air out of the tires to increase the amount of friction. What are some reasons your friend might think this? Discuss whether or not these reasons are consistent with what you have learned about friction.

Answers

Explanation:

The center of mass of a system acted on only by internal forces cannot accelerate. without friction a car cannot move. This is a consequence of Newton's third law

What happens to the signal inside of the cell phone? Describe at least two kinds of transformations or changes that happen to the signal inside of cell phone.

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Answer:

When you're talking on a cell phone, it converts your voice into a signal that is transmitted via radio waves to the nearest cell tower. The cell tower then relays the radio wave back to the person you're speaking to, converting it first to a signal and then back to sound again.

Explanation:

no explanation for you

but the answer is in the top!

A tow truck pulls a 3500 kg mazda car out of the mud. The car is moved 20 M in 4 seconds by the truck. What is the work done by the tow truck

Answers

Answer:

W = F * S one does not know the work performed because one does not know what force produced the resulting work. Neither can one calculate the power required because P = W / t (work / time)

One only knows the distance and the time but not the force required.

A train travels north at 103 km/hr. Is this an example of speed, velocity, or acceleration?

Answers

Answer:

velocity

Explanation:

when a speed is given with a direction it is velocity

Answer:

Velocity

Explanation:

Velocity is the rate, and direction of an objects movement.

Speed is the rate of and objects movement, no certain direction.

Acceleration is the rate when velocity changes over time, it can both increase and decrease, and it has both speed and direction.

I hope this helps! Have a great day!

Your Murderer~

The summary identifies the location(s) in the electric field where the field strength is the greatest, explains how the electric field strength changes due to a change in position, describes the movements of both a positive and a negative test charge placed in the electric field, predicts how the electric field changes due to an increase and decrease in voltage, and predicts how the electric field changes due to an increase and decrease in the distance between leads.

Answers

(a) When the voltage increases, the electric field increases, and vice versa.

(b) When the distance of the charge increases, the electric field strength decreases, and vice versa.

Electric field direction

The direction of the electric field depends on the direction of the positive charge, electric field is always directed opposite to positive charge.

Relationship between electric field and voltage

The potential of a unit charge is the product of the electric field strength and the distance of the charge.

V = Ed

E = V/d

Thus, when the voltage increases, the electric field increases, and when the voltage decreases, the electric field decreases.

Also, when the distance of the charge increases, the electric field strength decreases, and the distance decreases, the electric field strength increases.

Learn more about electric field here: https://brainly.com/question/14372859

What are the basic si units for the speed of light?.

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c=meters/second or C=m/s

Community psychologists are not
concerned with worker stress factors.
True
False

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it would be false as your answer

What happens if you suspend a bar magnet so that it can swing freely.

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The bar magnet will align with the earth's magnetic field; the north pole will point toward magnetic north.

help pls i been stuck on this for 40 mins already

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Answer:

See below

Explanation:

At A they add together (they are both positive)= construct

At B they destruct ( one is neg and one is pos)

c destruct d destruct e construct (both neg)

1. A woman shuts her summer cottage up in September and returns to June. No one has entered the cottage in the meantime
Explain what she is likely to find, in terms of the second law of thermodynamics.

Answers

The hot summer cottage she left in September will still be hot when she returns in June as long as no one enters it (Isolated).

What is second law of thermodynamics?

The second law of thermodynamics states that, hot things always cool unless you do something to stop them. Or the total entropy of an isolated system can never decrease.

In other words, not all heat energy can be converted into work in a cyclic process.

Therefore, we can conclude that when the woman returns, the hot summer cottage she left in September will still be hot when she returns in June as long as no one enters it (Isolated).

Learn more about second law of thermodynamics here: https://brainly.com/question/1022530

If a 20g bullet has a momentum of 8kg calculate its velocity

Answers

Explanation:

I hope this helps, you can ask any questions for clarification

Koto traveled 5,000 meters north from her house with an average velocity of 4.5 m/s. what was the time of her trip? (there are 60 seconds in 1 minute.) 18.5 minutes 20.4 minutes 2 hours 3 hours

Answers

Answer:

20.4 minutes

Explanation:

5000 m / (4 m/s) = 1250 seconds

1250 seconds / 60 seconds/minute = ~ 20.4 minutes

Time taken by Koto during her trip is (a) 18.5 minutes.

The details given in the question:

The distance travelled by Koto = 5000 meters

Koto's average velocity = 4.5 meters/second

To calculate time of Koto's trip following formulae is used:

Time = Distance/Velcoity

Time = 5000 meters/4.5 meters*[tex]Seconds^{-1}[/tex]

Time = 1111.11 seconds or 18.5 minutes

To learn more about the relation between speed, distance and time, refer:

https://brainly.com/question/13664094

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what the equation for speed?

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Answer:

Speed Formula:

[tex]s = \frac{d}{t} [/tex]

If a wave has a frequency of 50 Hz and a wavelength of 2 meters.
Find its speed.

Answers

Answer:

100 m/s

Explanation:

here we use the wave equation which states that the velocity is equal to the product of the frequency and the wavelength.

so v = 50 × 2

v = 100 m/s

If a rock falls from a cliff, at what point are its kinetic energy and its potential energy the same? Ignore air resistance.

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Answer:

The gravitational potential energy it had from being above the ground is converted to kinetic energy as the rock falls. As kinetic energy increases, the velocity of the rock will also increase.

Explanation:

I think its the whole time they are falling

lightnig can be described by which statement

Answers

Answer:

Lightning can be described by the flow of electric charges between the cloud and the ground.

Help, Please...Please Please, please please please, please, please please please please, please

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Answer: i thinks Its C

Explanation:

A scientist shines light from a source onto a piece of metal, and no electrons are released by the metal. Increasing the intensity of the light source does not change this result. What is this effect, and how do scientists explain it?

This is the Doppler effect, and it is best explained by the wave model of light.,

This is the Doppler effect, and it is best explained by the particle model of light.

This is the photoelectric effect, and it is best explained by the wave model of light.,

This is the photoelectric effect, and it is best explained by the particle model of light.

Answers

This is the photoelectric effect, and it is best explained by the particle model of light.

What is the photoelectric effect?

The photoelectric effect refers to the emission of negatively charged particles and electromagnetic radiation that hits an object.

The photoelectric effect shows how electrons can be released from a given object when this material is absorbing electromagnetic radiation.

The photoelectric effect is a fundamental piece of evidence for understanding the nature of light particles.

Learn more about the photoelectric effect here:

https://brainly.com/question/1359033

Is the sun making the side walk a chemical or phsical change

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Answer: it is chemical .

Explanation: because chemical change that results in the formation of new chemical substances. During the sun tanning, both vitamin D and melanin are produced. your welcome <3 .

During which phase of the moon can a lunar eclipse happen?.

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full moon!

when Earth is exactly between the Moon and Sun, Earth's shadow falls upon the surface of the Moon, dimming it and sometimes turning the surface red over the course of a few hours.

How long is a wave that has a frequency of 2.70X102 Hz and is moving through copper at 3560 m/s?

Answers

The wavelength of a wave that has a frequency of 2.70X102 Hz and is moving through copper at 3560 m/s is 13.19m.

How to calculate wavelength?

The wavelength of a wave can be calculated using the following formula:

λ = v/f

Where;

λ = wavelength (m)v = speed (m/s)f = frequency (Hz)

According to this question, a wave has a frequency of 2.70X10² Hz and is moving through copper at 3560 m/s. The wavelength is calculated as follows:

λ = 3560/270

λ = 13.19m

Therefore, the wavelength of a wave that has a frequency of 2.70X102 Hz and is moving through copper at 3560 m/s is 13.19m.

Learn more about wavelength at: https://brainly.com/question/13533093

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Under what circumstances can differentiation occur in a planet?.

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When planets begin to melt, the materials in them begin to separate from one another. The heaviest materials, such as metallic iron, sink to form cores. Low-density magmas rise, forming crusts. This process is called differentiation.

Plant cells contain both chloroplasts and mitochondria. Compare and contrast the functions
of these organelles.

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Answer:

Mitochondria and chloroplast are organelles found in a plant cell. However, chloroplast is absent in an animal but mitochondria is found in both. Mitochondria generates energy for the cell in the form of ATP using oxygen and nutrients. Chloroplast is the site for photosynthesis in a plant cell.

1) anything that has mass and takes up space is called
A. Tissues
B. Mass
C. Matter
D. Atomic number
E. Weight

2) mechanical energy is
A. Found in machinery only
B. Usually measured at the atomic level
C. The sum of the chemical and thermal energy of an object
D. The sum of the kinetic and potential energy of an object
( please answer it guys i really bad at my physics TnT))

Answers

1) Matter
2) The sum of the kitenic and potential energy of an object

Not sure about the second one but hope this helps

[tex]\qquad \qquad \huge \pink {\sf{☁Answer☁}} \\ \\ [/tex]

Anything that has mass and takes up space is :-

[tex]\pink{\boxed{\sf{↪Option.c↩}}}[/tex]

→Matter✓

mechanical energy is

[tex]\pink{\boxed{\sf{↪Option.d↩}}}[/tex]

→The sum of the kinetic and potential energy of an object✓

___________________☃️

[tex]\sf{\:мѕнαcкεя\: ♪...}[/tex]

What are nonrenewable resources?

They are natural resources that are in limited supply and can easily run out.

They are natural resources that are in abundant supply or that can replenish themselves.

They are abundant natural resources that humans do not have to recycle or reuse.

They are artificial resources that humans use but are not able to be recycled or reused

Answers

Answer:

No. 1 is the correct answer.

Explanation:

The natural resources which deplets after long and continious use and are unable to be recreated/ takes a lot of time to renew are non renewable resources

The lens parameter that enables us to brighten an image is _(blank)_.

A. diameter

B. refractive index

C. curvature radius

D. focal length

Answers

The lens parameter that enables us to brighten an image is called" Refractive Index"

What is refractive Index?

Refractive index of a material is a dimensionless number that describes how fast light travels through the material. Refractive Index is a value calculated from the ratio of the speed of light in a vacuum to that in a second medium of greater density.

Therefore, refractive index is the lens parameter that enables us to brighten an image.