It takes 35 J to push a large box 5 m across a floor.
Assuming the push is in the same direction as the
move, what is the magnitude of the force on the
box?
a. 5N b. 7N c. 35 N d. 175 N e. none of
the above

Answer:

To send a pulse of different speed, change the tension or stretch on the spring

Explanation:

A pulse is a single disturbance of a particle is a medium. The pulse has an amplitude or and a pulse length in the medium. The speed of the pulse is dependent on the amount of strain or tension ( stretch) applied to the medium. The speed also determines the length of the pulse but is unaffected by the or amplitude of the pulse.  

The minimum number of lines needed in a grating to resolve a doublet of 597.5 nm and 598.0 nm in the second-order spectrum is approximately 3,000 lines.

The formula for resolving power in a grating is given by:

Resolving Power (R) = N * λ / Δλ,

where R is the resolving power, N is the number of lines on the grating, λ is the wavelength of light, and Δλ is the separation between the two wavelengths to be resolved.

In the second-order spectrum, the effective wavelength for the doublet is λ_eff = λ / 2. Therefore, the separation between the two wavelengths to be resolved is Δλ = 598.0 nm - 597.5 nm = 0.5 nm.

Assuming we want a minimum resolving power of 1000, we can rearrange the formula to solve for N:

N = R * Δλ / λ.

Substituting the values, we have N = 1000 * 0.5 nm / 598 nm ≈ 0.837.

Since the number of lines must be an integer, we round up to the nearest whole number, resulting in N ≈ 1. Thus, we need approximately 3,000 lines to resolve the doublet.

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Explanation:

key to this problem is the impulse-momentum theorem which states that the change in the momentum of an object is equal to the impulse applied into it.

J

=

Δ

p

,

where

J

is the impulse and

Δ

p

is the change in momentum. Basically, the impulse is the product of force and time duration, that is,

J

=

F

Δ

t

In this problem, the impulse would be the product of the force stopping the rock and

0.7

s

.

On the other hand, momentum

p

is the product of the mass

m

and velocity

v

. Therefore, the change in momentum is given by

Δ

p

=

m

2

v

2

−

m

1

v

1

.

Starting with the impulse-momentum equation, we have

J

=

Δ

p

F

Δ

t

=

m

2

v

2

−

m

1

v

1

Divide both sides by

Δ

t

,

we get

F

Δ

t

Δ

t

=

m

2

v

2

−

m

1

v

1

Δ

t

F

=

m

2

v

2

−

m

1

v

1

Δ

t

Finally, substitute the values and we get

F

=

(

2

kg

)

(

0

)

−

(

2

kg

)

(

6

m

s

)

(

0.7

s

)

F

≈

−

20

kg

m

s

2

Since

1

N

=

1

kg

m

s

2

,

then

F

≈

−

20

N

Therefore, using the correct significant figures (in this case, we need one significant figure since 2 kg, 6 m/s and 0.7 s all have one) in the final answer, we would need to have approximately

20

N

force to stop the rock in

0.7

s

.

Note: The negative sign is referring to the direction of the force opposite of the direction of the velocity

v

1

.

The speed of sound follows the order: solids > liquids > gases due to differences in particle arrangement and density within each medium.

Depending on the medium it passes through, sound travels at varying speeds. In general, sound travels more quickly through solids, next through liquids, and last through gases. This is because solids' tightly packed particles make it possible for sound waves to efficiently pass through the material's thick structure. As a result of the less tightly packed particles in liquids compared to solids, sound waves move through them more slowly. In comparison to both solids and liquids, gases have the least dense arrangement of particles, which causes their sound speed to be slower. The density and elasticity of the medium, among other things, affect the particular speed of sound in each material.

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The question is -

What is the order of the speed of sound in liquids, gases, and solids from highest to lowest?

The speed of sound is fastest in solids, followed by liquids, and then gases.

The speed of sound refers to how quickly sound waves travel through a medium. It varies depending on the state of matter of the medium. In general, sound travels fastest through solids, followed by liquids, and then gases.

When sound waves pass through a solid, such as a metal rod, the particles in the solid are closely packed together. This allows the sound waves to propagate more efficiently, resulting in a higher speed of sound. For example, in steel, the speed of sound is approximately 5,960 meters per second.

In liquids, the particles are still relatively close together, but not as tightly packed as in solids. This leads to a slower speed of sound compared to solids. For instance, in water, the speed of sound is about 1,482 meters per second.

Gases have particles that are much more spread out, resulting in a slower speed of sound. The speed of sound in gases is influenced by factors such as temperature and composition. For example, at room temperature, the speed of sound in air is approximately 343 meters per second.

It is important to note that the speed of sound can vary within each state of matter depending on factors like temperature and density. However, the general trend is that sound travels fastest through solids, followed by liquids, and then gases.

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Answer:

A Child has a fast metabolism since it is growing fast it needs Food, Liquids, Sleep.

Explanation:

A father has already Grown and is only gaining age.

So we can Conclude that A child needs more body building food.

The distance from crest to crest or from trough to trough of a wave is called the wavelength.

A wavelength is the distance between two consecutive points on a wave that are in phase with each other, such as two adjacent crests or two adjacent troughs. In other words, it is the distance between any two points on a wave that are at the same point in their cycle of motion.

Wavelength is an important characteristic of any wave, including electromagnetic waves (such as light and radio waves), sound waves, and water waves. It is usually denoted by the Greek letter lambda (λ) and is expressed in units of length, such as meters (m), centimeters (cm), or nanometers (nm).

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Answer:

39.2m/s

Explanation:

gravitational force= 9.8m/s

9.8x4.0=39.2m/s

Answer:

controlled variable

Explanation:

here you go

A control variable refers to a variable that is not allowed to change during an experiment​.

A control variable or scientific constant can be described as an experimental element that is constant and unchanged throughout the course of the investigation in scientific experimentation.

Control variables can strongly affect experimental results where they are not held constant during the experiment in order to test the relative relationship between the dependent and independent variables.

A variable is held constant in order to assess the relationship between multiple variables in an experiment and is a control variable. A control variable is not changed throughout an experiment because its constant state allows the relationship between the other variables. A control variable is what is kept constant throughout the entire experiment.

Therefore,  a variable that is not allowed to change during an experiment​ is a controlled variable or scientific constant.

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Answer:

wait what do you mean? And why is this in physics?

Is this about the iron dome or something biblical?

Explanation:

Answer:

the story of Israel is part of the Bible that's what what you're your lesson is

Explanation:

The star's (u-b) color can be calculated by taking the logarithm base 2.80 of the ratio of the brightness measured using the u filter to the brightness measured using the b filter.

Logarithm is the type or capacity to which a base should be raised to yield a given number. Communicated numerically, x is the logarithm of n to the base b if bx = n, in which case one composes x = logb n. For instance, 23 = 8; Consequently, 3 is the logarithm of base 2 divided by 8, or 3 = log2 8.

The quotient's log is the difference between the logs. There is no way to simplify the log of a difference. The log coefficient is not the same as an exponent on the log. The exponent can only be transformed into the coefficient when the argument is extended to a power.

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Answer:  t = 10 s , s = 2,5 m

Explanation:   (1) Speed v = v0 + at and (2) distance s = v0t + ½at².

Now  v0 = 0.5 m/s , v = 0 and a = -0.05 m/s²

Solve from equation (1)   t = -v0 / a = - 0.5 m/s / -0.05 m/s² =   10 s

Add t = 10 s to equation (2 )   s = 0.5 m/s · 10 s + 0.5· (-0.05 m/s²)· (10 s)²

= 5 m - 2,5 m = 2,5 m

Answer:

\(1.2\; {\rm N}\), assuming that all other forces on this crab were balanced.

Explanation:

The impulse \(J\) on an object is equal to the change in momentum \(\Delta p\). In other words:

\(J = \Delta p\).

If the mass \(m\) of the object stays the same (as in the case of this question), the change in momentum can be rewritten as:

\(J = \Delta p = m\, \Delta v\), where \(\Delta v\) is the change in velocity.

Impulse is also equal to the net force on the object \(F_{\text{net}}\) times the duration \(\Delta t\) over which the force is applied:

\(J = F_{\text{net}}\, \Delta t\).

Equate the two expressions for \(J\) to obtain:

\(F_{\text{net}}\, \Delta t = m\, \Delta v\).

In this question:

Rearrange \(F_{\text{net}}\, \Delta t = m\, \Delta v\) and solve for the net force \(F_{\text{net}}\):

\(\begin{aligned}F_{\text{net}} &= \frac{m\, \Delta v}{\Delta t} \\ &= \frac{(3\; {\rm kg})\, (2\; {\rm m\cdot s^{-1}})}{5\; {\rm s}} \\ &= 1.2\; {\rm kg \cdot m\cdot s^{-2}} \\ &= 1.2\; {\rm N}\end{aligned}\).

Assuming that all other forces on this crab are balanced, the net force on the crab would be equal to the force from the tide. Hence, the tide would have pushed the crab with a force of \(1.2\; {\rm N}\).

Answer:

b 15

Explanation:

the atomic number is the number of the element

A person whose lens focuses light from distant objects in front of (rather than on) the retina has a condition called myopia.

What is Myopia ? Myopia is also known as nearsightedness. It is a refractive error that affects the eyes. A refractive error is an eye disorder that occurs when the eyes fail to focus light properly. As a result, the patient may see blurred images of objects located at a distance but can see nearby objects without difficulty.

People with myopia are unable to see distant objects clearly because the image is focused in front of the retina instead of directly on it. In most cases, myopia occurs when the eyeball is too long or the cornea is too curved. Myopia symptoms can start as early as childhood. It may progress with time if it is not treated.

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Answer:

Mass=3,time=15,height=50,g=10,Power=?.

Power=mgh/t.....3×10×15=1500/15=100Watts.

Answer:

\(\huge \boxed{\mathrm{100 \ Watts}}\)

Explanation:

\(\sf \displaystyle P=\frac{mgh }{t} \\\\\\ P=power \ (W) \\\\ m=mass \ (kg) \\\\ g=gravity \ acceleration \ (m/s^2) \\\\ h=height \ (m) \\\\ t=time \ taken \ (s)\)

\(\sf \displaystyle P=\frac{3 \times 10 \times 50 }{15}\)

\(\sf \displaystyle P=\frac{1500 }{15}\)

\(\sf \displaystyle P=100\)

i don't Know

Explanation:

learn from yourself.

Answer:

3

Explanation:

the image of your face you are looking will be 2 m behind you

The distance between the face and the front mirror is 0.5  m which results in making of image 0.5 meters behind the front mirror which makes 1 meter from you. Now that one meter in front and 1 meter in the back will add up to make it 2 meters away from you.

As shown in the image the distance between your face and the front mirror will add up twice as it will travel back to the face from its image behind the mirror.

Reflection in a plane mirror makes the image equally behind the mirror.

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Answer and Explanation in one:

In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors. So basically, you could possibly demonstrate with a variety of examples. One example may be just sitting on a table, waiting to get rolled off. I know it sounds silly, so here's another example. You are holding a bow and arrow, you pull back the arrow, aiming at the target. You are holding the arrow, filling it with potential energy. When it is let go, it is kinetic energy, the act of an object in motion, slowly riding of it's potential energy.

a. The force experienced by the dummy with a seatbelt is 11,000 Newton.

b. The force experienced by the dummy without a seatbelt is 4,400 Newton.

Given the following data:

a. To calculate the force experienced by the dummy with a seatbelt:

In order to solve for the force acting on the dummy, we would apply Newton's Second Law of Motion.

Note: The acceleration of an object is equal to the rate of change in velocity with respect to time.

Mathematically, Newton's Second Law of Motion is given by this formula;

\(F = \frac{M(v\;-\;u)}{t}\)

Substituting the given parameters into the formula, we have;

\(F = \frac{55(40\;-\;0)}{0.2}\\\\F = \frac{55\times 40}{0.2}\\\\F = \frac{2200}{0.2}\)

Force = 11,000 Newton.

b. To calculate the force experienced by the dummy without a seatbelt:

\(F = \frac{55(40\;-\;0)}{0.5}\\\\F = \frac{55\times 40}{0.5}\\\\F = \frac{2200}{0.5}\)

Force = 4,400 Newton.

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The drop in pressure is greater at Fairbanks than at Key West between 2 km and 4 km. This can be explained by the relationship between temperature and density.

The relationship between temperature and density can be described as follows: as temperature increases, the density of a substance decreases. The same is true in reverse: as temperature decreases, the density of a substance increases. This relationship between temperature and density helps to explain why the drop in pressure between 2 km and 4 km was greater at Fairbanks than at Key West.

This is because Fairbanks is located in a colder climate than Key West. Therefore, the air is colder in Fairbanks than in Key West. Since the air in Fairbanks is colder, it is denser than the air in Key West. As a result, when the air in Fairbanks rises to a higher altitude, it expands and cools, causing it to become even denser. This increase in density results in a greater drop in pressure between 2 km and 4 km at Fairbanks than at Key West.

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The binding energy is 49K MeV.

To calculate the binding energy of an atom of 49K, we first need to find the mass defect. The mass defect is the difference between the sum of the masses of individual protons and neutrons and the actual mass of the nucleus (the given mass of 49K).

49K has 19 protons and 30 neutrons (49 - 19). We'll use the given masses to find the mass defect:

mass_protons = 19 * 1.007825 amu
mass_neutrons = 30 * 1.008665 amu
mass_nucleons = mass_protons + mass_neutrons

mass_defect = mass_nucleons - 48.965514 amu

Now, we'll convert the mass defect to MeV using the given conversion factor:

binding_energy = mass_defect * 931.5 MeV/amu

This will give you the binding energy in MeV per atom for 49K.

About -420.97 MeV is the binding energy per atom for the element 49K. It should be noted that the negative sign signifies that energy is released as the nucleus forms, indicating a stable nucleus.

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The total mechanical energy of the bicyclist is 1400 J, obtained by adding her potential energy of 720 J and kinetic energy of 680 J. The correct answer is option B.

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Answer:

Approximately \(2.69\; {\rm A}\).

Explanation:

Ensure that all values are measured in standard units. Charge should be measured in coulombs, while time should be measured in seconds:

\(\begin{aligned}t &= 3.0\; {\rm hr} \times \frac{3600\; {\rm s}}{1\; {\rm hr}} = 10800\; {\rm s}\end{aligned}\).

Electric current \(I\) is the rate of flow of electric charge.

In order to find the electric current, divide electric charge \(q\) by the time \(t\) required to transfer these charge. If charge \(q\!\) is measured in coulombs and time \(t\!\) is measured in seconds, the unit of current \(I\)would be amperes:

\(\begin{aligned}I & = \frac{q}{t} \\ &= \frac{29000\; {\rm C}}{10800\; {\rm s}} \approx 2.69\; {\rm A}\end{aligned}\).

Answer:

Explanation:

To determine the height of the building, we can use the kinematic equation for vertical motion:

h = v₀t + (1/2)gt²

Where:

h is the height of the building

v₀ is the initial velocity of the ball (25 m/s)

t is the time taken for the ball to reach the ground (10 seconds)

g is the acceleration due to gravity (approximately 9.8 m/s²)

Plugging in the values:

h = (25 m/s)(10 s) + (1/2)(9.8 m/s²)(10 s)²

h = 250 m + (1/2)(9.8 m/s²)(100 s²)

h = 250 m + 490 m

h = 740 m

Therefore, the height of the building is approximately 740 meters.

Hope it helps!! :))

Answer:

L = L0 (1 - v^2 / c^2)^1/2

L0 is the proper length and L the distance measured by the space traveler

L = L0 (1 - .92^2)^1/2

L = L0 * .39 = 8.6 L-y * .39 = 3.4 L-y     as measured by space traveler

An object travelling in a circular path will experience centripetal acceleration.

It is directed towards the centre of the circle and allows the object to continually change its direction without changing its speed. The direction of centripetal acceleration is always perpendicular to the object's velocity.

The formula to calculate the centripetal acceleration of an orbiting object is:

ac = v² / r

Where:

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When a sound enters a new medium where the sound travels faster, it means the vibration of particles is high, and the wavelength of the waves increases which means the speed of the wave has increased. The frequency on the other hand will remain constant.

At 900 rpm, a fan spins. angular speed of the any point on a fan blade and tangential speed of a blade's tip if there is a 20 cm gap between the centre and the tip. 9.4 rads and 18.8 m/s.

Correct option is, C.

A amount or angle rotated (and angular displacement) by a rotating body in a given length of time is known as the angular velocity of the body. The symbol for it is omega (). The formula for angular velocity is rad/s = dtd. Radian per second serves as its SI unit.

The product of a moment of inertia (I) as well as the angular velocity () of the an object in rotation is the angular momentum. A vector quantity is angular momentum. Kg. m2 is the SI unit for angular momentum.

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