PHYSICS HIGH SCHOOL

Sampling error can be reduced by __________.A. none of the these affect sampling error
B. utilizing simple random samples
C. increasing the sample size
D. decreasing the sample size

Answers

Answer 1
Answer: C. increasing the sample size 

More samples can bring your averages closer to the correct answer

Related Questions

Trumpeter A holds a B-flat note on the trumpet for a long time. Person C is running towards the trumpeter at a constant velocity. Person B is running away from the trumpeter at the same rate. Person D is standing still the whole time.Which person hears a frequency that is lower than the B-flat?A) Person A B) Person B C) Person C D) Person D
the process in which mining companies restore land to its original Contours and replant vegetation is called
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Objects on the moon's surface have an acceleration due to gravity one-sixth that on the earth's. What would the 40 kg boy weigh on the moon? (Round answer to nearest tenth.)
What does work depend on in scientific terms?

Scientist infer that most of earth earliest atmosphere was produced by?

Answers

Scientists infer that most of Earth earliest atmosphere was produced by the escape of gases from Earth's molten surface. Once these gases were released from the very hot surface that covered the Earth, the earliest stages and levels of the atmosphere we know today were created. Many of those earliest gases still make up our atmosphere today.Hope this helps. Let me know if you need additional help!

Scientists infer that most of Earth earliest atmosphere was produced by the escape of gases from Earth's molten surface. Once these gases were released from the very hot surface that covered the Earth, the earliest stages and levels of the atmosphere we know today were created. Many of those earliest gases still make up our atmosphere today


Explanation:

Earth shaped through a method of accretion -collision of rocks and dirt particles, that step by step shaped a bigger and bigger object. These impacts generated loads of warmth, therefore early Earth would are a hot and desolate place. Vapour is assumed to own shaped a steam atmosphere, and incoming iron-rich rocks colliding with Earth would have reacted with a number of this water to provide rise to H gas.

1
Verify the identity. Show your work.

cot θ ∙ sec θ = csc θ

Answers

To verify the identity, we can make use of the basic trigonometric identities:
cot θ = cos θ / sin θ 
sec θ = 1 / cos θ
csc θ = 1 / sin θ

Using these identities:
cot θ ∙ sec θ = (cos θ / sin θ ) ( 1 / cos θ)

We can cancel out cos θ, leaving us with
cot θ ∙ sec θ = 1 / sin θ
cot θ ∙ sec θ = = csc θ

a gust of wind blows an apple from a tree. As the apple falls, the gravitational force on the apple is 2.25N downward and the force of the wind on the apple is 1.05N to the right. Find the magnitude and the direction of the net force on the apple.

Answers


Vertical component =  2.25 N downward

Horizontal component = 1.05 N to the right

Magnitude of the net force = √ (2.25² + 1.05²)
                                              = √6.165 =              2.483 N  (rounded)

Direction of the net force = tan⁻¹ (1.05/2.25) to the right of downward

                                           = tan⁻¹ ( 7/15 ) to the right of downward

                                           = 25° to the right of downward (rounded)

The magnitude of the net force on the apple is \boxed{2.48{\text{ N}}}.

The direction of the net force is with vertical \boxed{25^\circ}.

Further explanation:

Here, we have to calculate the magnitude and the direction of the net force on the apple.

Given:

The gravitational force exerted on the apple is 2.25{\text{ N}}.

Force exerted by the wind on the apple is 1.05{\text{ N}}.

Formula and concept used:

The gravitational force is a universal force and it act in downward direction that is towards the center of the earth.

The direction of the force exerted by the wind on the apple is towards write side in the horizontal direction.

So, the angle between the gravitational force and force due to wind will be 90^\circ that is both the forces are perpendicular to each other.

Consider gravitational force is W and force due to wind is F.

So, the net force applied on the apple is,

\boxed{R=\sqrt {\left( {{W^2} + {F^2} + 2WF\cos \theta } \right)} }

Here, \theta is the angle between both the forces which is equal to the 90^\circ.

So, the above equation can be written as,

R=\sqrt {{W^2} + {F^2}}                                                                                   …… (1)

The direction of the net force can be written as,

\boxed{\phi={{\tan }^( - 1)}\left( {(F)/(W)}\right)}                                  ….. (2)

Calculation:

Substitute 2.25{\text{ N}} for W and 1.05{\text{ N}} for F in the equation (1).

\begin{aligned}R&=\sqrt {{{2.25}^2}+{{1.05}^2}}\n&=\sqrt {6.165}\n&=2.48{\text{ N}}\n\end{gathered}

For the direction,

Substitute 2.25{\text{ N}} for W and 1.05{\text{ N}} for F in the equation (2).

\begin{aligned}\phi&={\tan ^( - 1)}\left( {\frac{{1.05}}{{2.25}}} \right)\n&=25^\circ\n\end{aligned}

Thus, the net force on the apple is \boxed{2.48{\text{ N}}} and direction of the net force is with vertical \boxed{25^\circ}.

Learn more:

1. Water is a compound: brainly.com/question/1073452

2. Expansion of the gas with change in temperature: brainly.com/question/9979757

3. Two arrows are fired simultaneously with the speed of 30m/s brainly.com/question/2370982

Answer detail:

Grade: Senior School

Subject: Physics

Chapter: Force

Keywords:

Wind blow, apple falls, gravitational force, wind force, magnitude of force, direction of force, 2.25N downward, 1.05N, magnitude and direction, net force on apple.

As a mercury atom absorbs a photon ofenergy, an electron in the atom changes from
energy level d to energy level e.
Determine the energy of the absorbed photon in
electronvolts.

Answers

Energy is absorbed when the electron moves from lower to higher energy level.

What is the Bohr theory?

The modern idea of quantized energy was introduced by Neils Bohr. In his theory, energy is absorbed when an electron moves from a lower to a higher energy level and energy is emitted when the object moves from a higher to a lower energy level.

The question is incomplete as the values are missing, However, energy is absorbed when the electron moves from lower to higher energy level.

Learn more about Bohr theory:brainly.com/question/11891941

#SPJ2
The energy absorbed by photon is 1.24 eV.
This is the perfect answer.

Select all that apply.There is no sound in the vacuum of space. Why?
Sound must travel through something that vibrates.
There is no energy in space.
There is no air to vibrate the human eardrum.
Space is too full of light energy.

Answers

Answer:

Sound must travel through something that vibrates.

There is no air to vibrate the human eardrum.

Explanation:

Waves can be divided into two types:

- Electromagnetic waves: these are waves produced by the oscillations of electric and magnetic field. This type of wave does not need a medium to propagate, so they can also travel through a vacuum

- Mechanical waves: these are waves produced by the vibrations of the particles in a medium - therefore, they do need a medium to propagate. Sound waves are part of this type, so they cannot travel through a vacuum.

According to these definitions, we can say that the correct choices are the following:

Sound must travel through something that vibrates. --> because they are mechanical waves

There is no air to vibrate the human eardrum. --> because they are mechanical waves
1. Sound must travel through something that vibrates.
and
3. There is no air to vibrate the human eardrum. 

If an object has an overall negative charge, what force will it feel when itgets close to an object with an overall positive charge? *

Answers

Answer:

When a negatively charged object is brought near a positively charged object, an attractive force is produced. ... When a negatively charged object is brought near the knob of a neutral electroscope, the negative charge repels the electrons in the knob, and those electrons move down the stem into the leaves.

Answer:

Suppose that you rubbed a balloon with a sample of animal fur such as a wool sweater or even your own hair. The balloon would likely become charged and its charge would exert a strange influence upon other objects in its vicinity. If some small bits of paper were placed upon a table and the balloon were brought near and held above the paper bits, then the presence of the charged balloon might create a sufficient attraction for the paper bits to raise them off the table. This influence - known as an electric force - occurs even when the charged balloon is held some distance away from the paper bits. The electric force is a non-contact force. Any charged object can exert this force upon other objects - both charged and uncharged objects. One goal of this unit of The Physics Classroom is to understand the nature of the electric force. In this part of Lesson 1, two simple and fundamental statements will be made and explained about the nature of the electric force.

Perhaps you have heard it said so many times that it sounds like a cliché.

Opposites attract. And likes repel.

These two fundamental principles of charge interactions will be used throughout the unit to explain the vast array of static electricity phenomena. As mentioned in the previous section of Lesson 1, there are two types of electrically charged objects - those that contain more protons than electrons and are said to be positively charged and those that contain less protons than electrons and are said to be negatively charged. These two types of electrical charges - positive and negative - are said to be opposite types of charge. And consistent with our fundamental principle of charge interaction, a positively charged object will attract a negatively charged object. Oppositely charged objects will exert an attractive influence upon each other. In contrast to the attractive force between two objects with opposite charges, two objects that are of like charge will repel each other. That is, a positively charged object will exert a repulsive force upon a second positively charged object. This repulsive force will push the two objects apart. Similarly, a negatively charged object will exert a repulsive force upon a second negatively charged object. Objects with like charge repel each other.

Explanation:
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