Which nucleus completes the following equation?
212 86 Rn-> 4 2 He+?

Answer:

Explanation:

Here we are given sound moving in air at 43.2 m/s and that has a frequency of 2.11 hz and we need o calculate the Wavelength.

Using formula:

[tex] \\ \: \: \longrightarrow \: \: \:{ \underline{ \boxed{ \sf Frequency = \dfrac{Wave \: speed}{Wave \: length}}}} \\ [/tex]

Where,

On Substituting the values, we get:

[tex]\\ \sf \: \: \: \longrightarrow \: \: \: 2.11 = \dfrac{43.2}{Wave \: Length} \\ \\ \\ \sf \: \: \: \longrightarrow \: \: \:Wave\: Length = \frac{43.2}{2.11} \\ \\ \\ \sf \: \: \: \longrightarrow \: \: \:{ \pink{ \underline{Wave \:Length = 20.47 m}} }\\ \\ [/tex]

Hence,

[tex]\large\boxed{\bold{Formula: λ= \frac{v}{f}}}[/tex]

In this question all the values are given so we'll simply have to substitute the values and solve.

Let's solve!

We'll have to divide the velocity or speed by the frequency.

Substitute the values according to the formula.

[tex] λ= \frac{43.2}{2.11}[/tex]

Calculator answer:

[tex]\bold{λ= 20.47393365 \: m}[/tex]

Now, we can round off to the nearest hundredth.

The value in the thousandths place is smaller than 5 so we won't have to round up.

Final answer:

[tex]\large\boxed{\bold{λ= 20.47 \:m}}[/tex]

Therefore, the wavelength is 20.47 meter.

Answer: Option A

Two instruments based on Archimedes' principle

Explanation:

Archimedes' principle states -

OR

Applicatios : Lactometer , hydrometer.

Answer:

Warm air is less dense than cold air, and warm air holds more moisture than cold air.

Explanation:

HOPE THIS HELPS AND HAVE A NICE DAY <3

#1

Double displacement reaction

Balanced one

#2

Decomposition reaction

Balanced one

Answer:

3.96 meters / sec

Explanation:

The skaters Kinetic Energy is converted to Potential Energy ( ignoring friction)

KE = PE

1/2  * 55 * v^2 = 55 * 9.81 * .8

solve for v = 3.96 m/s

Let initial velocity be v

So

initial kinetic energy

Final velocity is four times v i.e 4v

Final kinetic energy

Find ratio

Or

Option C

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Answer:

true

Explanation:

because rubbing together they will both have friction

Answer:

Measurements are a basic necessity in science. Scientists have designed thousands of different tools to help in the vital process of measuring. In this image of the control panel of the space shuttle Atlantis, we see dozens of readouts from measuring systems.

Answer:

1.5v

Explanation:

This is a series circuit with identical components, so the potential difference will be shared equally between each component. (1.5V + 1.5V) / 2 = 1.5V

According to the diagram, voltmeter 1 will show 1.5 V. Because it is a series combination voltmeter 2 will also show 1.5 V.

The potential difference, or voltage, between two points in an electrical or electronic circuit is measured using a voltmeter, also referred to as a voltage meter. While some voltmeters are made for use in alternating current (AC) circuits, others are meant to be used in direct current (DC) courses. Voltage for radio frequency (RF) can be measured using specialized voltmeters.

A simple analog voltmeter is a high resistance connected in series with a sensitive galvanometer (current meter). A voltmeter needs to have high internal resistance. Otherwise, it will consume a sizable amount of current, interfering with the test circuit's performance. The range of voltages that the meter can display depends on the series resistance value and the sensitivity of the galvanometer.

Since all of the components in this series circuit are the same, any potential difference will be distributed equally i.e., (1.5V + 1.5V) / 2 = 1.5V

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149,597,871 kilometres

hope it helps...!!!

A ravine is a smaller version of a canyon that is typically formed by stream bank erosion. Ravines are greater in scale than gullies, but smaller than valleys.

A ravine is a  slope landform with relatively steep sides,Ravines may or may not contain active streams running along the down slope channel that produced them.

Ravine are frequently characterized by intermittent streams, since their geographic size is too small to maintain a perennial watercourse.

Hence, a ravine is a smaller version of a canyon that is typically formed by stream bank erosion.

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Wavelength = 0.16m to 2.dp

Wavelength = wave speed / frequency

= 1,151 ÷ 7,143

= 0.1611367773

Hope this helps!

#1

Here

Calcium is less reactive than sodium so it can't displace Na .

Nothing will happen

#2

This is oxidation

Answer:

11. Light waves are electromagnetic (created by electromagnetic impulse)

12. Light waves in a medium are slower V = C / Nm where Nm is the index of refraction of the medium

13. The frequency of the vibration remains the same

14. The wavelength of light in the medium is less

λ = V / f    and it was determined in 12 that the velocity is less in the medium

Answer:

the answer is The lens forms a real image.

Explanation:

got it right on edge

Answer:

false .....................

It important to assess flexibility both before and during a workout regimen because to assess flexibility progress.

Flexibility exercises, as the name implies, help to increase the stretch of the muscles, improving the range of motion. More flexibility is also important to help prevent possible post-workout soreness.

In this case we have that the reason to continue doing stretching before and during the exercises is about  to assess flexibility progress.

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Answer:

A

Explanation:

The order is followed as

Answer:

See below ~

Explanation:

Done from left to right :

Box 1 : Photosynthesis

Box 2 : Respiration

Box 3 : Combustion

Box 4 : Decomposition

Box 5 : Diffusion

The time it will take to decay 6.25 grams is 24.4684 days.

A radioactive substance's half-life is often described as the amount of time it takes for one of its atoms to break apart or transform into another. Ernest Rutherford originally examined the theory in 1907. This is typically represented by the sign Ug or t1/2.

To make the concept clearer, let's use a radioactive element with an hour-long half-life.

Now according to the question the given values are :

T(1/2) for iodine-131 is 5.10 days,

[A]₀ for iodine-131 is 50 grams and,

[A] for iodine-131 is 6.25 grams.

T(1/2)=0.693/k

⇒8.10=0.693/k

⇒k=0.865 [tex]days^{-1}[/tex].

2.303 log [A]₀/[A]= kt

2.303 log(50.00/6.25)= 0.085×t

⇒t=1/0.085×2.303×log8

t=24.4684 days

Hence, the time it will take to decay is 24.4684 days.

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Answer:

V = 65 at 101.7 deg

Vx = V cos θ = 65 cos 101.7 = -13.2

Vy = V sin θ = 65 sin 101.7 = 63.6

The last option is correct

Answer:

heat energy

Explanation:

Friction causes the molecules on rubbing surfaces to move faster, so they have more energy. This gives them a higher temperature, and they feel warmer.

Answer:

Explanation:

The quantity of energy transferred by a force when it is applied to a body and causes that body to move in the direction of the force work.

Answer:

Drinking water

Our foods

Washing clothes

Thermal energy from the injured area transfers to the ice and the thermal energy transferred in this scenario is conduction.

Conduction heat transfer is the transfer of heat through matter such as  solids, liquids, or gases without bulk motion of the matter.

The  ice pack absorbs the heat energy without the actual movement of the molecules of the ice pack.

Thus, thermal energy from the injured area transfers to the ice and the thermal energy transferred in this scenario is conduction.

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Answer:

1. What is the best description of thermal energy?

B) Thermal energy is the energy in matter due to the movement of its atoms and/or molecules.

2. An athlete hurts their wrist. They put an ice directly on the wrist. In which direction is the thermal energy moving?

B) The thermal energy is moving from the wrist to the ice pack.

3. What happens when two substances with different temperatures come into contact?

B) Thermal energy is transferred from the warmer substance to the cooler substance.

4. Which is the best description of what happens when thermal energy is removed from a substance?

B) Its particles lose kinetic energy and move more slowly.

5. Which of the following is typically part of the knowledge base of research and development scientists working on heating devices?

A) substances and their properties

Explanation:

i just finished the quick check

The attraction between masses as small as our bodies, or even objects the size of skyscrapers, is incredibly small. For example, two 1.0-kg masses located 1.0 meter apart exert a force of 6.7×10−11N 6.7 × 10 − 11 N on each other.Answer:

Explanation:

Even between objects the size of skyscrapers or masses as small as our bodies, there is incredibly little attraction. For instance, a force of 6.71011N is generated when two 1.0-kg masses are placed 1.0 meters apart. 6.7 10 11 N on top of one another.

M/s2 is its SI unit. Its vector nature—which includes both magnitude and direction—makes it a quantity. The unit g stands for gravitational acceleration. At sea level, the standard value of g on earth's surface is 9.8 m/s2.

The magnitude of PQ is represented symbolically as | PQ |. The Distance Formula can be used to determine a vector's magnitude if its start and end points' coordinates are known.

Therefore, The distance between a vector's starting point P and ending point Q is its magnitude.

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Answer:

A. It pulls objects towards the center of Earth.

Explanation:

Think about dropping something, where does it go? If you are on earth, this goes down towards the ground due to the attractive force of gravity on every object (to pull everything to center of earth). Like Newton's apple.

Answer:

17N

Explanation:

the side with most net force is going to be deducted by the side with the least net force.