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Question: A hemisphere is uniformely charged positively. The electric field a point on a diameter away from the centre is directed

(a) perpendicular to the diameter

(b) parallel to the diameter

(c) at an angle tilted towards the diameter

(d) at an angle tilted away from the diameter​

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)

Answer:

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

Answer: B

Explanation: The wavelength determines color. The wavelength is measured from crest to crest.

(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.

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

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.

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Answer:  i thinks Its C

Explanation:

Answer: B, the speed of baseball pitch

Explanation:

The speed of a baseball pitch is an example of a measurement that considers velocity, therefore the correct answer is option B.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter/second.

average speed = total distance /Total time

The speed of the baseball pitch is an example of the measurement of velocity.

The size of a  standard basketball is an example of the measurement of length.

similarly, option C and option d are unrelated to the measurement of the velocity.

The correct response is option B since a baseball pitch's speed is an example of a measurement that takes velocity into account.

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Answer:

8

Explanation:

According to the 10% law of energy transfer,

only about 10% of energy will be transferred to

the successive level from the previous trophic

level. Therefore according to this law carrot will

have the highest energy level as it is present at

the lowest trophic level.

Then it will transfer 10% of its consumed energy

to the rabbit and then snakes will get 10%

energy of rabbit after consuming it. Therefore if

the energy amount is given it can be calculated

by dividing it by 10 for upper trophic level.

So if a rabbit receives 80 calories of energy

from eating carrots it will pass only 8

(80/10=8) calory of energy on to a snake.

Therefore the correct answer is 8 calories

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:

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

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.

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The reasoning in the passage is : ( C ) The spots are the result of interference, which happens with waves but not particles

Light passed through a slit and projected onto a screen will form a pattern which is very visible and the pattern might have dark spots if there is some form of interference. Interference is present in waves and not particles.

Hence we can conclude that the reasoning in the passage is The spots are the result of interference, which happens with waves but not particles

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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

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.

Answer:

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

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

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.

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

λ = v/f

Where;

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.

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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 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

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Explanation:

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

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

Answer:

Speed Formula:

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

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]

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

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

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Answer:

The correct answer is DIAMETER. Just took the quiz

Explanation

Answer:

Beta Particles

Explanation:

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 .

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~