If you have two spoons of the same
size, one silver and one stainless
steel, there is a quick test to tell
which is which. Hold the end of a
spoon in each hand, then lower them
both into a cup of very hot water.
One spoon will feel hot first. Is that
the silver spoon or the stainless steel
spoon? Explain.​

Answer:

The penny will hit the ground at 6.39 seconds

Explanation:

Free Fall

The penny is dropped from a height of y=200 m. The equation of the height on a free-fall motion is given by:

\(\displaystyle y=\frac{gt^2}{2}\)

Where \(g=9.8\ m/s^2\), and t is the time.

Solving for t:

\(\displaystyle t=\sqrt{\frac{2y}{g}}\)

Using the value y=200:

\(\displaystyle t=\sqrt{\frac{2*200}{9.8}}\)

t=6.39 sec

The penny will hit the ground at 6.39 seconds

Answer:

I cannot fully see the picture, but I'm going to have to tell you to go with towards the sun because it says summer.

Answer:

The materials used to make electronic components like transistor and integrated, circuit behave as if effective particles known as electron through them, causing electrical properties

a.

The object's speed at 2.20 m below balcony level is 8.74 m/s

Let the balcony level be 0 m and the height above the balcony level be positive and height below the balcony level negative.

Using the principle of conservation of energy, the total energy at a vertical height of 1.89 m above the balcony level equals the total mechanical energy when the object is 2.20 m below the balcony level and

So, E = E'

U + K + f = U' + K' + f'

where U = initial potential energy at 1.89 m = mgh, K = initial kinetic energy at 1.89 m = 0 J(since it is released from rest), f = energy loss at 1.89 m = 0 J, U' = final potential energy at 2.20 m below balcony level = mgh', K = final kinetic energy at 2.20 m = 1/2mv², f' = energy loss at 1.89 m = 10%U = 0.10mgh(since 10% of the initial energy is lost).

So,

U + K + f = U' + K' + f'

mgh + 0 + 0 = mgh' + 1/2mv² + 0.10mgh

mgh = mgh' + 1/2mv² + 0.10mgh

Dividing through by m, we have

gh = gh' + 1/2v² + 0.10gh

So, gh -  0.10gh = gh' + 1/2v²

0.90gh = gh' + 1/2v²

1/2v² = 0.90gh - gh'

1/2v² = g(0.90h - h')

v² = 2g(0.90h - h')

Taking square-root of both sides, we have

v = √[2g(0.90h - h')]

where v = velocity of object at 2.20 m below balcony level, h = height above the balcony level = 1.89 m, h' = height below the balcony level = -2.20 m and  g = acceleration due to gravity = 9.8 m/s²

Substituting the values of the variables into the equation, we have

v = √[2g(0.90h - h')]

v = √[2 × 9.8 m/s²{0.90 × 1.89 m - (-2.20 m)}]

v = √[2 × 9.8 m/s²(1.701 m + 2.20 m)]

v = √[2 × 9.8 m/s²(3.901 m)]

v = √[76.4596 m²/s²]

v = 8.74 m/s

So, the object's speed at 2.20 m below balcony level is 8.74 m/s

b.

Yes it does matter when we apply 10% loss before V calculations

We need to apply the 10 % loss before V calculations because this would give us a proper value for V since the energy is lost before V is obtained.

So, yes it does matter when we apply 10% loss before V calculations

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Answer: b

Explanation:

The reading of the scale of the elevator  ascending with constant velocity is 150 N.

The reading of the scale on the elevaor is calculated by applying Newton's second law of motion;

R = m(a + g)

R = ma + mg

R = F + W

where;

At constant velocity, the acceleration of the object is zero (0).

R = 0 + 100 + 50

R = 150 N

Thus, the reading of the scale of the elevator  ascending with constant velocity is 150 N.

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(C)

...........................

Answer:

Hope this helps!

Explanation:

In order to find the formula for net force, multiply both sides by mass.

Newton's second law of motion states that the rate of change of momentum is directly proportional to the force applied.

Given is the acceleration as the ratio of net force and mass.

We can write acceleration as -

a = F[net]/m

If we have to find the formula for net force, we will multiply both sides by mass (m). Therefore -

a x m = (F[net]/m) x m

am = F[net]

or

F[net] = ma

Therefore, in order to find the formula for net force, multiply both sides by mass.

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Answer:

125J

Explanation:

\(work \: = force \: \times distance \\ = 25 \times 5 \\ = 125joules\)

According to problem ( considering sign convention for convex lens)

height of object = 2.25 mm;

object distance(u)= - 8.5 cm

focal length (f)= 5.5 cm

image distance(v)= ?

Using lens formula

a) Answer is :- Location of image = 15.58cm

Using magnification formula

b) Height of image = 4.12 mm

C) Magnification= 1.83

Answer:

Electromagnetic waves are periodic oscillations in the intensity of an electromagnetic field. OR. An electromagnetic wave is a transverse wave that has electrical and magnetic properties

Answer:

92,832,852.3 miles

Explanation:

Option b) is correct answer.  b)Force of friction is approximately 1N

Friction is that force which resists the relative motion of solid surfaces, fluid layers and material elements sliding against each other.

When only gravity is considered then the force on block is written as :

F= mgsin = ma

a= gsin

=g sin30

=9.8 *1/2

=4.9 m/s²

a= 5  m/s²

When friction considered is  4 m/s² that is given,

Then frictional force is in opposite direction

It is given as, F= mgsin - F

ma =mgsin- ma friction

4= 5 - a friction

afriction = 1 m/s²

Ffriction = 1N, hence option b is correct

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Answer:

A

Explanation:

The lets say the magnet is is facing the north and a piece of iron is near it. The iron will become magnetized since the protons will be repelled leaving only the electrons creating a magnetic field. Or in other words a temporary magnet is made, this is only as long a the actual magnet is close enough to the iron.

Answer:

HOPE THIS ANSWER WILL HELP YOU

hi <3

the correct option would be A. displacement. displacement is distance in a direction

hope this helps :)

Answer:

its hopping

Explanation:

hope this helped!

Answer:

hopping YEAHhhhhhhhhhhhhhhhhhh

Answer:

1.363×10^15 seconds

Explanation:

The spaceship travels an elliptical orbit from a point of 6590km from the earth center to the moon and 38500km from the earth center.

To calculate the time taken from Kepler's third Law :

T^2 = ( 4π^2/GMe ) r^3

Where Me is the mass of the earth

r is the average distance travel

G is the universal gravitational constant. = 6.67×10-11 m3 kg-1 s-2

π = 3.14

Me = mass of earth = 5.972×10^24kg

r =( r minimum + r maximum)/2 ......1

rmin = 6590km

rmax = 385000km

From equation 1

r = (6590+385000)/2

r = 391590/2

r = 195795km

From T^2 = ( 4π^2/GMe ) r^3

T^2 = (4 × 3.14^2/ 6.67×10-11 × 5.972×10^24) × 195795^3

= ( 4×9.8596/ 3.983×10^14 ) × 7.5059×10^15

= 39.4384/ 3.983×10^14 ) × 7.5059×10^15

= (9.901×10^14) × 7.5059×10^15

T^2 = 7.4321× 10^30

T =√7.4321× 10^30

T = 2.726×10^15 seconds

The time for one way trip from Earth to the moon is :

∆T = T/2

= 2.726×10^15 /2

= 1.363×10^15 secs

Answer:

-The wave will be reflected but inverted

Explanation:

This is a transverse wave because the wave is moving to the right and the particles are moving up and down. When a transverse wave reaches the end, it is reflected and inverted so the crest becomes through and the through becomes valleys. So, the answer is

-The wave will be reflected but inverted.

Because when a wave finds a fixed end, the wave is reflected, which means that there will be a wave with the same speed and amplitude but in the opposite direction.

Answer:

Explanation:

Reverse the second equation, and change the sign of the enthalpy

Take into account that the period is the inverse of the frequency. In this case, the frequency is 2000 rev/min, then, you have:

The period is 0.0005 minutes.

In seconds the answer results in:

0.0005 min = 0.0005*60 seconds = 0.03 seconds

The period is 0.03 seconds

Answer:

V = 0.05 m^3

Explanation:

The weight of the object of mass (m) and volume (V) in water is: 275 N and it is calculated using the buoyancy formula:

275 N = m g - V (dw) g

where (dw) is the density of water (1000 kg/m^3)

The weight of the object in oil is 325 N and it is calculated using the buoyancy formula as:

325 N = m g - V (do) g

where "do" is the density of oil which is: 0.9 x 1000 kg/m^3 = 900 kg/m^3

Therefore, subtracting term by term the two equations:

325 N -275 N = mg - mg - V (do) g + V (dw) g

50 N = V g  (dw - do)

50 N = V g (1000 - 900)

50 N = V g (100)

solving for V (which will result in units of m^3):

V = 50 / 981   m^3

V = 0.05 m^3

Energy flows from the Sun to producers, then to primary consumers, secondary consumers, and potentially to tertiary consumers, forming a pyramid-shaped structure that represents the transfer of energy through different trophic levels in an ecosystem.

Energy flows in a specific order through various components of an ecosystem, starting with the Sun and progressing through producers and consumers. This flow of energy is known as the energy pyramid or trophic levels.

At the base of the energy pyramid is the Sun, which is the ultimate source of energy for most ecosystems on Earth. Sunlight provides the energy needed for photosynthesis, a process carried out by plants, algae, and some bacteria, collectively known as producers. These organisms convert solar energy into chemical energy through photosynthesis, using carbon dioxide and water to produce glucose and oxygen. This process captures and stores energy in the form of organic compounds.

The next level in the energy pyramid consists of primary consumers, also known as herbivores. These are animals that feed directly on producers, such as grazing animals or insects that consume plants. Herbivores obtain energy by consuming plant material and breaking down the organic compounds present in the plants into simpler forms, such as sugars and amino acids, through digestion.

Above the primary consumers are the secondary consumers, which are carnivores or omnivores that feed on herbivores. They obtain energy by consuming primary consumers and breaking down the organic compounds in their prey through digestion. This energy transfer continues up the trophic levels, with each level consuming the one below it.

At the top of the energy pyramid are tertiary consumers, which are typically apex predators. They are carnivores that consume other carnivores. Tertiary consumers obtain energy by consuming secondary consumers and breaking down the organic compounds in their prey.

It's important to note that energy is not efficiently transferred between trophic levels. Only a fraction of the energy consumed at each level is converted into biomass and passed on to the next level. This inefficiency is due to processes such as respiration, heat loss, and incomplete digestion.

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Answer:

Data

Explanation:

Data is factual information not subject to bias.

This ultimately implies that, data connotes fact, thus, it is an information that is credible, accurate, a statement of truth, evidential and proven.

In Computer programming, a data dictionary can be defined as a centralized collection of information on a specific data such as attributes, names, fields and definitions that are being used in a computer database system.

In a data dictionary, data elements are combined into records, which are meaningful combinations of data elements that are included in data flows or retained in data stores.

This ultimately implies that, a data dictionary found in a computer database system typically contains the records about all the data elements (objects) such as data relationships with other elements, ownership, type, size, primary keys etc. This records are stored and communicated to other data when required or needed.

The second lowest frequency where the constructive interference occurs is \($254.074 \mathrm{~Hz}$\).

Given data

- The distance of person from one speaker is: \($d_1=5.70 \mathrm{~m}$\).

- The distance of person from other speaker is: \($d_2=3.00 \mathrm{~m}$\).

- The speed of sound is: \($v_{\text {sound }}=343 \mathrm{~m} / \mathrm{s}$\).

It is provided that the constructive frequency occurs at the second lowest frequency.

Thus, \($N=2$\).

The expression for the wavelength for this constructive interference is,

\($$\lambda=\frac{d_2-d_1}{N}$$\)

Substitute the values.

\($$\begin{aligned}\lambda & =\frac{5.70 \mathrm{~m}-3.00 \mathrm{~m}}{2} \\& =1.35 \mathrm{~m}\end{aligned}$$\)

The expression for the second lowest frequency is,

\($$f_{\text {second_lowest }}=\frac{v_{\text {sound }}}{\lambda}$$\)

Substitute the values.

\($$\begin{aligned}f_{\text {second_lowest }} & =\frac{343 \mathrm{~m} / \mathrm{s}}{1.35 \mathrm{~m}} \\& =254.074 \mathrm{~s}^{-1}\left(\frac{1 \mathrm{~Hz}}{1 \mathrm{~s}^{-1}}\right) \\& =254.074 \mathrm{~Hz}\end{aligned}$$\)

Thus, the second lowest frequency where the constructive interference occurs is \($254.074 \mathrm{~Hz}$\).

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Answer:

The difference between them is that the velocity-time graph reveals the speed of an object (and whether it is slowing down or speeding up), while the position-time graph describes the motion of an object over a period of time.

Explanation:

The mass spectrometer separates ions of different masses by utilizing the relationship between the strength of the magnetic field, the accelerating voltage, the charge-to-mass ratio of the ions, and the resulting radius of the circular path

From the formula in the question;

B is a symbol for the magnetic field's intensity as it is applied to the mass spectrometer.

The accelerating voltage used to move the ions is called Vaccelm.

The charge of the ion, specifically its charge-to-mass ratio (q/m), is represented by the letter q.

The mass spectrometer may selectively alter the radius of the circular route for various ions by varying the magnetic field's intensity (B). This makes it possible to spatially segregate ions with various masses based on their various radii. The ions' locations and masses can then be measured using detectors placed along the journey.

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