How long does it take to raise a drawbridge?.

The correct answer is due to Newton’s laws of motion i.e., an object at rest at rest remains at rest that’s why the crate falls back.

What governs motion, according to Newton?

Unless influenced by an imbalanced force, an item at rest stays at rest, and an object in motion keeps moving in a straight path at a constant pace. An object's acceleration is determined by its mass and the force being applied.

The crate naturally prefers to stay at rest while the truck moves ahead, so the truck will often slide beneath it and leave the crate behind.

It is all due to Newton's First Law, specifically the inertia of motion or rest.

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Answer:

a) 27 degree Celsius

b) 493.15K

c) 86 Fahrenheit

d) 126.667 degrees celsius

Explanation:

a) To convert from Kelvin scale to Celsius scale, subtract 273 from Kelvin scale

Hence, 300 - 273 = 27 degree celsius

b) The temperature T in Kelvin (K) is equal to the temperature T in degrees Celsius (°C) plus 273.15, that conversion formula:

T(K) = T(°C) + 273.15

hence, 220 + 273.15 = 493.15K

c) The formula to convert Celsius to Fahrenheit is °F = °C × (9/5) + 32

F = [ C × (9/5) + 32 ]

Given that, C = 30

F = 30 × (9/5) + 32

F = 54 + 32

F = 86

Thus, 30 °C is equivalent to 86 °F.

d) Formula

(260°F − 32) × 5/9 = 126.667°C

Answer:

1

Explanation:

The counter advances each time an ionising particle enters a GM tube.

Only one alpha particle entering the GM tube is needed to make the counter advance by one.

A Geiger counter is a tool used to find and quantify ionized gas particle concentrations. It is widely utilized in fields including experimental physics, radiation dosimetry, and radiological defence. It consists of a metallic tube that is filled with gas and to which a high voltage supplied in multiples of 100V is applied. Alpha, beta, and gamma particles are all detected.

It is crucial to ensure that the least amount of radioactive material is delivered to human subjects when using radioactive isotopes in medical research studies on people. The radioactivity of materials must be measured with an extremely sensitive device in order to accomplish this. Geiger and Muller created a "particle detector" in 1928 that they named a "Geiger Muller Counter," or simply the "GM counter," to monitor ionizing radiation.

This  Geiger-Muller (GM) tube can be used to detect ionizing radiation. Only one alpha particle entering the GM tube is needed to make the counter advance by one.

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If the wavelength of the particle is 1.5 x 10⁻¹⁵ m,  the mass of the particle will be 1.636 × 10⁻²⁷ kg

Velocity of the particle = 90.0% of c ( speed of light)

Wavelength of the particle (λ) = 1.5 × 10⁻¹⁵ m

Mass of the particle = ?

Calculate the velocity of the particle

    velocity = (90.0 / 100)(3 × 10⁸ m/s)

    velocity = (0.90)(3 × 10⁸ m/s)

    velocity = 2.70 × 10⁸ m/s

Now calculate the mass of the particle by using the following equation:

   λ = h / mv

Rearrange the equation for mass

    m = h / λv

value of h = 6.626 × 10⁻³⁴ Kg.m².s⁻¹

Put the values

    m = (6.626 × 10-34 Kg.m².s⁻¹) / (1.5 × 10⁻¹⁵ m)(2.70 × 10⁸ m/s)

    m = 1.636 × 10⁻²⁷ Kg

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Cepheid Variables stars are intrinsic variables which pulsate in a foreseeable way. In addition, a Cepheid star's phase (how often it pulsates) is directly related to its luminosity or brightness. Cepheid variable stars are good standard candles.

First, their luminosity is quite lofty (the most luminous Cepheids are 40,000 times more luminous than the Sun), so they can be noticed at large distances. Second, their luminosities can be determined from the Period-Luminosity Relation.

Through observations of Cepheid variables, astronomers have reckoned the distances to other galaxies. They compare the Cepheid variable's apparent brightness with its intrinsic brightness. The distinction between observed and actual brightness relents the distance.

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Answer:

a star whose luminosity pulses at a regular rate

Explanation:

got it on quiz right

The mass of Ashanti's book is 1.6kg if the book gains 4.7 J of gravitational potential energy.

The term mass refers to the quantity of matter that makes up something or someone. Additionally, mass can be thought of as the resistance an item has to changes in velocity and, consequently, changes in acceleration, as acceleration is the rate at which velocity changes.

Since it takes effort to lift objects out of the gravitational pull of the Earth, gravitational energy is the potential energy associated with gravitational force. Water in an elevated reservoir or kept behind a dam serves as evidence for gravitational potential energy, which is caused by elevated positions.

The formula for potential energy

PEg=mgh

PEg=4.7J

g=9.8N/kg

h=0.8m

m=?

4.7=m×9.8×0.8

4.7=7.84m

m=7.8/4.7=1.6

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The force between the spheres after each mass is doubled is 160N.

Every particle in the cosmos attracts every other particle with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers, according to Newton's law of universal gravitation.

Coulomb's law of electrical forces, which is used to determine the strength of the electrical force developing between two charged things, is similar to Newton's law of gravitation. The force is inversely proportional to the square of the distance between the bodies under both inverse-square rules.

From newtons law of gravitation, we know that

F = (Gm₁m₂)/ r²

Initially,

Given that F₁ = 40N

F₁ = (Gm₁m₂)/ r²

F₂ = (Gm₁m₂)/ r²

Now, m₁ = 2m₁

m₂ = 2m₂

Thus,

F₂ =  (G * 2m₁ * 2m₂)/ r²

F₂ = 4 F₁

F₂ =  4 * 40N

F₂ = 160 N

The force between the spheres after each mass is doubled is 160N.

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Answer:

False

Explanation:

As the mass of a neutron is slightly greater than the mass of a proton

When he is 4 m away from the building, the speed at which his shadow lengthens is -0.41 m/s.

An angle is a shape that is made up of two rays or lines that have a shared terminal. The name "angle" comes from the Latin word "angulus," which means "corner." The common terminal of the two rays—known as the vertex—is referred to as an angle's sides. The angle in the plane does not always need to be in Euclidean space.

Given,

Distance of man from building = x

∴ initially, x = 12

dx/dt = -1.1 m/s

Let,

Shadow height = y

Now,

Solve for [tex]\frac{dy}{dt}[/tex] : when x=4

From the diagram it seen similar triangles with similar base/height ratios,

[tex]\frac{2}{12-x}[/tex] = [tex]\frac{y}{12}[/tex]

y = [tex]\frac{24}{12-x}[/tex]

[tex]\frac{dy}{dt}[/tex] = [tex]\frac{24}{(12-x)^{2} }[/tex] × [tex]\frac{dx}{dt}[/tex]

At x= 4,

dy/dt becomes:

[tex]\frac{24}{(12-4)^{2} }[/tex] × (-1.1)

∴ y = -0.41 m/s

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The Scrum event that will see the Scrum master asking question such as average velocity, upcoming vacations, and those responsible for sprint tasks is Sprint planning .

Scrum events allow an organization to engage in processes where they are able to develop products and services which are then used to compete in the market and allow for the organization to meet its goals. There are five scrum activities or events and they are:

In sprint planning, the team in question tries to work such that they can figure out how they can go about the scrum activity. The scrum master will try to find out how fast the team members have been going in terms of accomplishing goals, the availability of team members, and the responsibilities of the scrum members.

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Declaring war, levying taxes, regulating commerce, minting money, and controlling immigration are five instances of implied powers.

Thus these are the five examples of implied powers.

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Using the concepts of electromagnetic waves, we got that wavelength and frequency are inversely proportional to each other for  all waves on the electromagnetic spectrum.

Electromagnetic waves are actually referred for the photons of the light.

Wavelength and frequency are inversely proportional to each other: wavelength × frequency = constant. Their product is equal to the velocity (λf = c). This relation is true of all kinds of wave motion, including sound, although for sound the velocity is about a million times less.

Hence, the relationship between wavelength and frequency of all waves on the electromagnetic spectrum is inversely proportional to each other.

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Additional time taken before the ball passes the tree branch is 1.13s.

Here we have to find the additional time.

Given data:

Initial velocity(u) = 15.8 m/s

x is the height at which the ball reaches the greatest height after the height of 6.81m.

Height =( 6.81 + x)m

Final velocity (v) = 0

Acceleration due to gravity (g) = 9.8 m/s²

Formula:

v = u + at

0 = 15.8 - 9.8t

t = 15.8/ 9.8

 = 1.66s

Now we have:

Average velocity = Average distance/ average time

0 + 15.8/ 2 = (x + 6.81)/ 1.66

7.9 × 1.66 = x + 6.81

13.114 - 6.81 = x

x = 6.30

As the distance is 6.30.

So the additional time taken is:

Average velocity = Average distance/ Average time

0+ v/ 2 = 6.30 / t

v = 12.6/t

Now we have

v = u + at

a = v-u/t

-9.8 =( 0 - 12.6/t)/ t

9.8 = 12.6/ t²

t² = 12.6/ 9.8

  = 9/ 7

t = 3/ 2.645

 = 1.13s

Therefore the time taken is 1.13s.

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Answer:

B) Age, gender, and joint structure cannot be changed.

Explanation:

gimme brainliest! :-)

28.11 u is the Average atomic mass of Silicon.

Average atomic mass of Si

= 28×92.25+29×4.65+30×3.10÷100

=28.11 u

The mass of the components that make up an element's atom is referred to as its atomic mass. One-twelfth of the mass of the carbon-12 atom, which has an assigned atomic mass of 12 units, is expressed as a multiple of 1.992646547 1023 gram, or more precisely as 1.992646547 gram. One atomic mass unit is equivalent to 1.660539040 1024 grams on this scale (amu). The atomic mass unit is occasionally referred to as the dalton in honor of English scientist John Dalton (Da).

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Answer: 100N

Explanation:

Weight on earth = 600N

Let g= 10m/s^2 on earth

Mass on earth =  600/10 =60 kg

Now, since mass is a constant quantity so, it will remain 60 kg on the moon also.

Now, weight on moon = mg

m= mass =60 kg

g′ = acc. due to gravity on moon =  1/6th  the value on earth

So, Weight on moon =  1/6th  of the weight on earth

⇒ Weight on the moon =600 × 1/6​ = 100 N

Hope it helps and good luck!

Answer:

Below

Explanation:

First of all, the horizontal speed is irrelevant to the question...not needed.

The time to hit the ground can be computed by

HEIGHT = 1/2 a t^2         where a = 32.2 ft/s^2   or 9.81 m/s^2

     solve this for 't' in seconds

as the HEIGHT was not given in the question, this cannot be answered though you can say     t =   sqrt ( 2 * height / a )

(a) The frequency of the siren's sound that the fire engine's driver hears reflected from the back of the truck is 2243.9Hz.

(b) The wavelength of the reflected sound waves by the listener is 0.143 m.

We use the principle of Doppler's effect to find the results.

The Doppler's effect is a phenomenon when the source of a wave and an observer move relative to each other, the frequency heard is not the same with the actual frequency.

The equation of the Doppler's effect is

f₀ = (v + v₀) fs / (v + vs)

Where

Note:

There are a truck and a fire engine emitting a siren sound moving in the same direction.

Determine the frequency and the wavelength of the sound waves heard by the listener in the front!

We have the truck is in front of the fire engine. So, the sound source moves closer and the observer moves away. Then, frequency of the sound waves heard by the observer is

f₀ = (v - v₀)/(v - vs) × fs

f₀ = (340 - 19.0)/(340 - 31) × 2160

f₀ = (321/309) × 2160

f₀ = 2243.9 Hz

The wavelength of the sound waves heard by the observer is

λ₀ = (v - v₀) / f₀

λ₀ = (340 - 19) / 2243.9

λ₀ = 321 / 2243.9

λ₀ = 0.1430545

λ₀ = 0.143 m

Hence,

(a) The observer frequency of sound is 2243.9Hz.

(b) The wavelength of the reflected sound waves by the observer is 0.143 m.

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The magnitude of the average contact force exerted on the leg by the person is 2238.8N.

A person slaps her leg with her hand which results her hand to come to rest in a time interval of 2.25 millisecond from an initial speed of 3.25m/s.

According to second law of motion of Newton,

The average force applied by a body can be given by the change in momentum per unit time of the body.

So, we can write,

F = M∆V/t

Putting values,

F = 1.55 x 3.25 x 10³/2.25

F = 2238.8 N.

So, the magnitude of the average contact force exerted on the leg is 2238.8N.

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Answer:

Explanation:

Given:

h = 60 cm

H = 189 cm

_________

K - ?

The magnification:

K = H / h

K = 189 / 60 ≈ 3.15

The toy percentage efficiency is 23%.

Solution:

The kinetic energy is:

KE = [tex]\frac{1}{2} mv^{2}[/tex]

KE = [tex]\frac{1}{2} *(150)(0.25)^2[/tex]

KE = 4.6875 J

The elastic potential energy is:

E = 0.5 x 4 x 10 = 20

E = 100 J

The percentage efficiency of the toy is found as:

%n = [tex]\frac{4.6875*100}{20}[/tex]

%n = 23%

The more the elastic material is stretched the greater the potential for elastic energy storage. The amount of elastic potential energy stored in a stretched spring can be calculated using the formula: Work is done when the spring expands and contracts.

Springs store elastic potential energy. If no inelastic deformation has occurred, the work done is equal to the stored elastic potential energy. As the spring constant increases for a constant applied force, the spring deflection decreases as the spring stiffness increases.

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The center of mass of the lamina would be in the middle of the axis and the mass of the lamina is 25.

For this, we will use the polar coordinates. According to the change of coordinates, where r and theta are the new parameters. Given a point (x,y) in the plane, r is the distance from (x,y) to the origin and theta is the angle formed between the line that joins the origin and the point, and the x-axis.

        We need to describe the region D in terms of the new parameters. Replacing the values of x,y in the given inequality, we get that . Since and r>0 we get that r<=5. On the other side, in order to describe the whole region of the first quadrant, we need to sweep the angle theta from 0 to. With that, we can calculate the mass of the lamina as follows here, the extra r appears as the Jacobian coordinates.

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Internal organs unconsciously react to environmental changes as a result of reflexes, particularly autonomic reflexes, which help control homeostasis.

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Answer: i got 0.4s

Explanation:

As the object is moving under constant force,we can apply the equation,

v=u+at where, v is the velocity attained after time t which had an initial velocity of u.

a=F/m=50/4=12.5ms^-2

Given, u=0

So, if v=5 then, t = 512.5 = 0.4s

An observer in one of those galaxies sees the other galaxy moving away at a velocity of 400000 Km/s.

When an object has a particular velocity, then this velocity is w.r.t. frame which is known as the reference frame. When we determine the velocity of an object, the ground is considered the reference frame.

The motion of an object can be observed by the observer depending on the frame of the observer and this type of motion is relative motion.

When the two galaxies on opposite ends are moving away in opposite directions with a velocity of 200000 Km/s

The relative velocity of these two galaxies = 200000 + 200000

Relative velocity = 400000 Km/s

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To find the massive stars known the luminous first.

What is luminous?

Luminous objects are those that produce their own light. Sun, candle flame, among other examples Non-luminous items are those that are unable to produce light on their own. These objects reflect light from their luminous bodies.

What is main sequence star?

Any star that is fusing hydrogen in its core and has a stable equilibrium between the inward pressure from gravity forces and the outward pressure from core nuclear fusion is considered to be in the main sequence.

Therefore, we can conclude that star A is more massive because the luminous stars are massive.

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Let the initial velocity be u And the angle of projection is e Then, the distance between the person and the ball where it lands is called range.

If the angle with the horizontal increases Distance between the person and the ball where it lands decreases which means the ball lands closer to the person if the angle of projection increases, the range decreases.

Maximum altitude is determined by initial vertical velocity. A steeper launch angle increases the vertical velocity component, so increasing the launch angle increases the maximum altitude. The higher the degree of release, the longer the flight distance. Projectiles are launched higher, so they stay in the air longer. A horizontal component acts long on the projectile.

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The speed increases but acceleration decreases.

In mechanics, acceleration is the price of change of the velocity of an object with respect to time. Accelerations are vector quantities. The orientation of an item's acceleration is given by means of the orientation of the net force performing on that object.

Acceleration is, rate at which pace modifications with time, in phrases of each speed and direction. A point or an item transferring in a direct line is increased if it hurries up or slows down. motion on a circle is multiplied even supposing the speed is regular, due to the fact the path is constantly changing.

Acceleration. pace is the fee of alternate of displacement. Acceleration is the charge of change of pace. speed is a vector quantity as it includes both value and course. Acceleration is also a vector amount as it's far simply the rate of trade of velocity.

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The pressure decreases when the speed increases then internal pressure in a fluid flowing in a horizontal pipe its speed decreases The pressure increases when the speed decreases.

What is Pressure?

However, 101325 Pa is what it is at sea level.

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Because they can't move water very far, plants without vascular tissue can't get very tall. A cell wouldn't be able to bring in the materials it need if it got too big.

Vascular tissue is a multicellular conducting tissue that is intricate in structure and is present in vascular plants. Vascular tissue is primarily composed of xylem and phloem. These two tissues absorb water and nutrients inside. Two other meristems connected to vascular tissue are the vascular cambium and the cork cambium. The vascular tissue system of a particular plant consists of all of its vascular tissues.

Typically, vascular tissue has long, slender cells. Given that they act as pathways for the transportation of water, minerals, and nutrients throughout the plant, it is not unexpected that the xylem and phloem resemble pipes. Phloem's individual cells are connected end to end like the sections of a pipe.

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