If+a+1.10+cm+thick+piece+of+lead+can+absorb+90.0%+of+the++rays+from+a+radioactive+source,+how+many+centimeters+of+lead+are+needed+to+absorb+all+but+0.031%+of+the+'s?

Answer:

CO2 and H2O

Explanation:

Answer:

1st box: 2

2nd box: 1

3rd box: 4

4th box: 3

Explanation:

Kinetic energy the energy an object has due to its being in motion.  Potential energy is energy held by an object because of its position relative to another object.

The relationship between the force due to gravity (mg) and the normal force (n) exerted by the scale

due to upward accelaration.

N = mg + ma , here N MEANS normal force

here now, N > mg  realtionship between normal force and force

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Answer:

Newton discovered gravity and Albert Einstein is a theoretical physics

Explanation

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The chance that one, and only one, of the dice will land acer is It could boost the river's erosive force and flow rate.

When water from rain, snowmelt, and groundwater is brought to the surface, steam flow starts. Drainage systems are created in a way that effectively removes water from the land. Moving sheetwash, a thin water surface layer, is where streamflow starts. As it descends the sharpest slope, the water begins to erode the surface by forming tiny rill channels. Larger channels form as the rills merge, deepen, and downcut. Headward erosion, often known as rapid erosion, lengthens the channel upslope. Smaller tributaries join a bigger stem stream as neighboring channels merge over time.

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The calculated magnitude percentage is 125 %.

The Heisenberg Principle has a significant impact on how science is done and how experiments are created. This will transfer some of the momentum from the second particle to the electron being measured, changing it. A particle with a shorter wavelength and higher energy would be needed to measure the electron's position with more accuracy, but this particle would also change the momentum of the collision even more.

Pi is P Pf plus 50/100. P = 3/2 P

E = P2/2m describes how kinetic energy and momentum are connected.

E2 = (E2 - E 1)/E1 [E1 = E, E2 =?

100 = Pi 2/ 2m/ (Pf 2/2m - Pi 2/2m)

×100 = {(3/2) ² - 1} ×100 = (2.25-1) ×100 = 125%

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A circular loop of wire carries a constant current. If the loop is placed in a region of the uniform magnetic field, the net magnetic force on the loop is zero.

In an electric loop, the current-carrying wire creates a magnetic field that is perpendicular to the direction of the current.

Now let's suppose there are two diametrically opposite objects as shown in the figure below.

As the current is moving in the opposite direction, therefore, the effect of forces will cancel out each other due to  

dF =i( dl × B ).

It is because the magnetic field is perpendicular to the plane of the loop.

Thus, all forces will cancel out their effect and the net force on the loop will be zero.

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The amount of water (in grams) that must be added to 5.80 g of urea [(nh2)2co] in the preparation of a 6.40 percent by mass solution is 84.83g.

When the masses of a solute and a solution are provided, the concentration of the solution is expressed using the mass percent:

Mass% = Mass of Solvent 100% of Solution's Mass

The percent by mass solution = the grams of solute in 100 g. of solution.

(A) So, 6.40 g of urea are contained in 100 g of solution.

So, 93.6 water was added to make a 6.40 g solution.

Thus for, 5.80 g of urea,

(5.8*93.6)/6.4 = 84.83g

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Answer:

action and reaction forces

Explanation:

An motion pressure is a pressure that is utilized to an object. A response pressure is a outcome of an action force which is opposite in direction.

The number of water molecules which are ionized in 1L of pure water at pH 7.0 is equivalent to 6×10¹⁶ molecules.

The number as a percentage of the total water molecules is 1.8×10⁻⁷ % .

At pH 7.0, [H⁺]=10⁻⁷ M, so 10⁻⁷  moles of water molecules have ionized. This is almost equal to (10⁻⁷  mol)(6×10²³ molecules. mol⁻¹) = 6×10¹⁶ molecules.

For the second part of the question let the concentration of water be 55.5 M, then there are (55.5 mol)(6×10²³ molecules.mol⁻¹) = 3.3×10²⁵ molecules of water in 1L. The fraction of ionized molecules is 6×10¹⁶ molecules)/(3.3×10²⁵ molecules) = 1.8×10⁻⁹ or 1.8×10⁻⁷ %.

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The shape of municipal water tank has the same shape as a drop of water resting on a nonabsorbent surface, such as a wax paper.

The engineers design the tank in this manner because:

A cylindrical water tank is more economical to build than others because it requires less construction material. The main reason is that it has the smallest possible girth-to-area ratio than a box-shaped tank. Here you can save costs.

Since circular structures minimize the surface area that heat radiates from, the water temperature remains more stable than other structures such as a square or rectangle. It therefore remains less affected by changing outside temperatures and keeps the water cooler in summer and warmer in winter.

According to Monolithic, the round structure is the strongest geometric structure than the square. Thus, a cylindrical water tank can withstand all external forces, such as strong wind or heavy rain, better than a square or rectangular tank. Thanks to this, the tank lasts longer.

Cylindrical tanks are comparatively easier to clean than tanks with corners. Therefore, the water remains more hygienic in round water tanks than others.

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According to Archimedes' principle, (a) the submerged volume is 1 liter and (b) the density of object is 1102 kg/m³.

We need to know about Archimedes' principle to solve this problem. Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid is proportional to the volume and density of the fluid. It can be determined as

Fb = ρ . g . V

where Fb is buoyant force, ρ is the density of the fluid, g is the gravitational acceleration (9.8 m/s²) and V is submerged volume.

The buoyant force also can be calculated by measuring the change in weight in air and water

Fb = Wa - Ww

where Wa is weight in air and Ww is weight in water.

From the question above, we know that

Wa = 10.8 N

Ww = 1 N

ρ = 1000 kg/m³

Find the buoyant force

Fb = Wa - Ww

Fb = 10.8 - 1

Fb = 9.8 N

Determine the submerged volume

Fb = ρ . g . V

9.8 = 1000 . 9.8 . V

V = 1/1000 m³

V = 1 dm³ = 1 liter

Determine the density of the object

Wa = m . g

10.8 = m . 9.8

m = 1.102 kg

ρ = m/V

ρ = 1.102 / 1

ρ = 1.102 kg / liter

ρ = 1102 kg/m³

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Answer:

mohans face simple

if u see the drivers face in the mirror

the drive will see ur face

Answer:

In a longitudinal wave, the medium or the channel moves in the same direction with respect to the wave. Here, the movement of the particles is from left to right and forces other particles to vibrate. In a transverse wave the medium or the channel moves perpendicular to the direction of the wave.

Explanation:

The translational kinetic energy does it have  -6,528.21  joule

we have given the values of

v = 3.85m/s

m =  881 kg

kinetic energy = m[tex]v^2[/tex]/2

= 881 [tex]\times[/tex] [tex](3.85)^2[/tex]/ 2

= 881 [tex]\times[/tex]14.82/ 2

= 13,056.42

= 6,528.21  joule

Hence kinetic energy of car is 6,528.21  joule

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Answer:

The metre per second (m/s) is the unit of both speed (scalar quantity) and velocity in the International System of Units (SI).

The process of gravitational collapse does not work in the silicon-fusion cycle that produces iron. It is because the iron nuclei do not have sufficient energy and therefore will not produce the additional gas pressure to halt the collapse.

The gravitational collapse process is a process during which astronomical objects such as massive stars contract due to their own gravitational pressure.

The gravitational pull draws the matter to the core of the object thus increasing energy generation which in turn increases the temperature of the central part of the object.

Due to this fundamental process, the old structure collapse, and new structure are formed in the universe.

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A certain current produces a magnetic field be near the center of the solenoid if the current is 3B .

Thus, the magnetic field in the core of a solenoid is directly proportional to the product of the current flowing around the solenoid and the number of turns per unit length of the solenoid. This, result is exact in the limit in which the length of the solenoid is very much greater than its diameter.

Now,

Magnetic field due to solenoid

B= u0nI

where n is number of turns per unit length and I is current.

Now I is tripled, hence magnetic field

B' =μon 3I =3B.

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The wavelength of light (nm) is required to eject an electron with a speed of [tex]2.0 \times 10^{6}[/tex] m/s from a metal with threshold energy of [tex]3.4 \times 10^{-18 }[/tex]jis 0.39nm.

A periodic wave's spatial period, or the distance across which the wave's form repeats, is defined by its wavelength. It is a characteristic of both traveling and standing waves as well as other spatial wave patterns, and it is the distance between two adjacent corresponding points of the same phase on the wave.

Speed of proton =[tex]c= 2.0 \times 10^6[/tex] m/s

The threshold energy of the proton is [tex]E = 3.4 \times 10^{-18} J[/tex]

The proton's wavelength is expressed as follows:

λ=hc/E

h is the Planck constant in this situation.

Now substituting the values,

λ= [tex](6.63\times 10^{-34}J/s\times 2.0 \times 10^{6} m/s)/3.4\times 10^{-18} J[/tex]

=3.9x 10^-10 m

=0.39nm

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Answer:

650 miles

Explanation:

if car 65mph constant = 1hour = 65 mile x 10 = 650.

The change his direction from the intersection where the traffic light is located is 5m in south direction.

The displacement covered by a body per unit time is defined as its velocity. Velocity is a vector quantity that indicates the magnitude of the body's speed as well as the direction in which the body is moving. As a result, the velocity of an object can provide us with the direction of motion of the body.

Acceleration can now be defined as the rate at which an object's velocity changes per unit time. The particle's velocity rises with time in the direction of acceleration. Again, if acceleration is perpendicular to velocity direction, the body moves in a circular route. As a result, acceleration can also indicate the direction of motion of a body.

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A bat will take  3.03 s to detect a predator approaching at a distance of 1000m away

The formula and procedure we will use to solve this exercise is:

t = x/v

Where:

Information about the problem:

Applying the time formula from the uniformly rectilinear motion (URM), we have:

t = x/v

t = 1000 m / 330 m/s

t = 3.03 s

It is a physical quantity that indicates the displacement of a mobile per unit of time, it is expressed in units of distance per time, for example (miles/h, km/h).

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Answer: B. Yes; a false hypothesis gives a scientist new information to use.

Explanation:

      Let us take a look and break down all the question's answer options.

✗ A.

Yes; now he knows that the exact opposite of his hypothesis must be true.

➜ This is not the case. He must look at this data and decide what is true.

✓B.

Yes; a false hypothesis gives a scientist new information to use.

➜ Yes! We learn from our research and looking back at our hypothesis.

✗ C.

No; a false hypothesis makes a scientist look silly.

➜ This isn't true. You cannot expect to be right all the time, and scientists make incorrect hypotheses frequently.

✗ D.

No; false hypotheses are a waste of time.

➜ Tying back into B and C, this isn't true. We learn from comparing our hypotheses with our data.

The metal with a mass of 27.0 g and a volume of 10.0 cm3 has a density of: 2.70 g/cm3

The density formula and the procedure we will use is:

d = m/v

Where:

Information about the problem:

Applying the density formula, we get:

d = m/v

d = 27.0 g/ 10.0 cm3

d = 2.70 g/cm3

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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Answer:

31.38 s (2 d.p.)

Explanation:

Constant Acceleration Equations (SUVAT)

[tex]\boxed{\begin{array}{c}\begin{aligned}v&=u+at\\\\s&=ut+\dfrac{1}{2}at^2\\\\ s&=\left(\dfrac{u+v}{2}\right)t\\\\v^2&=u^2+2as\\\\s&=vt-\dfrac{1}{2}at^2\end{aligned}\end{array}} \quad \boxed{\begin{minipage}{4.6 cm}$s$ = displacement in m\\\\$u$ = initial velocity in ms$^{-1}$\\\\$v$ = final velocity in ms$^{-1}$\\\\$a$ = acceleration in ms$^{-2}$\\\\$t$ = time in s (seconds)\end{minipage}}[/tex]  

When using SUVAT, assume the object is modeled as a particle and that acceleration is constant.

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To find the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor, we to accelerate to the maximum allowed velocity as quickly as possible, maintain the maximum velocity for as long as possible, and then decelerate for the shortest period of time in order for the elevator to come to a stop after 373 m.

Therefore, the travel time from the start of the elevator trip to the end will have three phases:

Given information:

The time it takes to accelerate from rest to the maximum allowed velocity, where the elevator accelerates at the maximum allowed acceleration:

[tex]\begin{aligned}v & = u+at\\\implies 14.3 & = 0+2.7t\\t & = \dfrac{14.3}{2.7}\\t & = 5.296296296\;\sf s\end{aligned}[/tex]

The distance covered in this time is:

[tex]\begin{aligned}v^2 & = u^2 + 2as\\\implies 14.3^2 & = 0^2 + 2(2.7)s\\204.49 & =5.4s\\s & = \dfrac{204.49}{5.4}\\s & = 37.86851852\; \sf m\end{aligned}[/tex]

Given information:

When the elevator is decelerating from the maximum velocity to being at rest, it will take the same amount of time and cover the same distance as its acceleration phase:

[tex]\begin{aligned}v & = u+at\\\implies 0& = 14.3+(-2.7)t\\2.7t&=14.3\\t & = \dfrac{14.3}{2.7}\\t & = 5.296296296\;\sf s\end{aligned}[/tex]

[tex]\begin{aligned}v^2 & = u^2 + 2as\\\implies 0^2 & = 14.3^2 + 2(-2.7)s\\0 & = 204.49 -5.4s\\5.4s&=204.49\\s & = \dfrac{204.49}{5.4}\\s & = 37.86851852\; \sf m\end{aligned}[/tex]

The total distance the elevator travels is 373 m.  

Therefore, the distance it travels during phase 2 when it is traveling at a constant (maximum) velocity is the total distance less the distance traveled in phases 1 and 3:

[tex]\begin{aligned}\implies s & =373-2(37.86851852)\\s& = 297.262963\;\sf m\end{aligned}[/tex]

Given information:

Therefore, the time is takes to travel this distance when it is traveling at a constant (maximum) velocity is:

[tex]\begin{aligned}s&=\left(\dfrac{u+v}{2}\right)t\\\implies 297.262963 & = \left(\dfrac{14.3+14.3}{2}\right)t\\297.262963 & = 14.3t\\t & = \dfrac{297.262963}{14.3}\\t & = 20.78761979 \; \sf s\\\end{aligned}[/tex]

Therefore, the minimum time is the sum of the time calculated for the three phases:

[tex]\begin{aligned}\sf Minimum \: time& = \sf Phase \: 1 + Phase \: 2 + Phase \: 3\\& = 5.296296...+5.296296...+20.78761...\\& = 31.38021...\\& = 31.38\; \sf s\end{aligned}[/tex]

Answer:

A mercury-used clinical thermometer has a kink near its bulb because

Explanation:

it helps to slow mercury going back to the bulb and get the accurate temperature.

Sending the SIGTSTP signal will halt or suspend a running process. kill -TSTP 342; is the command.

What is linux machine?

The local system's distinctive machine ID, which is specified at installation or boot, is stored in the /etc/machine-id file. The machine ID is a single, 32-character, lowercase, hexadecimal ID that ends with a newline. This is equivalent to a 16-byte/128-bit value when decoded from hexadecimal.

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During stage 3 of star formation, the dense, opaque region at the center of the cloud is named a:Herbig-Haro object.

Bright nebulosity patches known as Herbig-Haro (HH) objects are linked to young stars. They are created when fast-moving, nearby clouds of gas and dust meet with narrow jets of partly ionized gas released by stars. Typical Herbig-Haro objects can contain up to 20 Earth masses of material and have temperatures of about 10,000 Kelvin.

They also have densities of a few thousand to a few hundred thousand particles per cubic centimeter. Over 600 have been discovered so far, all in star-forming regions and typically connected to Bok globules. They were once extremely rare. A brilliant cloud that stretches away from a star in the process of formation is known as a Herbig-Haro object (or HH object). The gravitational agglomeration of clouds produces protos tars.

Hence, During stage 3 of star formation, the dense, opaque region at the center of the cloud is named a:Herbig-Haro object.

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A. A constant acceleration means that the speed of the object is constant.

Constant acceleration is defined as a change in velocity that does not vary over time.

During constant acceleration of an object, the change in velocity of the object with time is the same or constant for all points of the object's motion.

a = Δv/Δt

where;

During constant acceleration, the variable change in velocity (Δv) will be constant with change in time.

Thus, a constant acceleration means that the speed of the object is constant.

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