Styrofoam holds onto its electrons because is has a high _____ for them.

a
polarization
b
affinity
c
insulator
d
conductor

Answer:

sorry im not good at math so sorry i cant help

Explanation:

The new efficiency of the ideal engine rated at 50% is : 59%

Given data :

Inital exhaust temperature = 20ºC

Final exhaust temperature = - 30 ºC

The efficiency of an ideal engine can be calculated with the formula below

η = 1 - Texhaust / Tinput

Therefore :

Tinput = Texhaust / 1 - η ---- ( 2 )

where : Texhaust = 293 k ,   η = 0.50 ,

insert values into equation ( 2 )

Tinput = 293 / 1 - 0.50

           = 586 k

The new efficiency of the ideal engine ;

η = 1 - T'exhaust / Tinput

  = 1 - 243 / 586

  = 1 - 0.41 = 59%

Hence we can conclude that the new efficieny is 59%

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Answer:

refraction

Explanation:

Answer:

False - Electromagnetic waves are transverse waves - they do not need a particular medium for transmission - as sound waves in air (longitudinal waves)

The rms current, in amperes, in the secondary winding is 0.5 A and the rms current, in milliamperes, in the primary winding is 31.25 mA.

The rms current, in amperes, in the secondary winding is calculated as follows;

V = IR

I = V/R

I = 7.5 / 15

I = 0.5 A

The rms current, in milliamperes, in the primary winding is calculated as follows;

[tex]\frac{I_p}{I_s} = \frac{V_s}{V_p} \\\\I_p = \frac{V_sI_s}{V_p}\\\\I_p = \frac{7.5 \times 0.5}{120} \\\\I_p = 0.03125\\\\I_p = 31.25 \ mA[/tex]

Thus, the rms current, in amperes, in the secondary winding is 0.5 A and the rms current, in milliamperes, in the primary winding is 31.25 mA.

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Answer:

Work = Force * Distance        definition of work

W = F * d

If one uses 1/2 the force to move an object, then he must move the force thru twice the distance to get the same work output.

Answer:

18.60  m/s

Explanation:

Original momentum = mv = 4000        with m = 115    

after collision   m = 115 + 100 = 215 kg

  but the total momentum is still the same (conserved)

          4000 = 215 v      shows v = 18.60 m/s

Answer:

18.60

Explanation:

For a system released from rest at θ = 0° when a constant couple moment M = 100 N.m is applied,  the speed of the 10-kg block is mathematically given as

V=4.33m/s

Generally, the equation for the workdone  is mathematically given as

W=T tehta<dtheta

W=100(90*\pi/180)

W=1.5707*100

W=1.57Nm

The change in potential energy across the pulley

dP=mgh

dp=10*9.81*111.8

dp=10.97J

For the thrid position, potential energy is

dP=mg(0.3)

dP=17.658J

dP'=17.658J-13.125

dP'=-4.532J

For 2nd position dP=0

The change in Kinectic energy across the pulley\

dK.E=0.5mv^2

For 1st

dk.E=0.5m(10)^2

2nd

dK.E=0.5Iw^2

dK.E=0.5(7.5*10^-3)(v^2/0.05)^2

3rd

2nd=3rd

In conclusion,

157.07=dKE+dP.E

157.07=5v^2+ (7.5*10^-3)(v^2/0.05)^2+10.97-4.53

V=4.33m/s

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The work done to pull the object 7.0 m is the total area under the graph from 0.0 m to 7.0 m, determined as 245 J.

The area under force versus displacement graph is work done.

The total work done by pulling the object 7 m, can be grouped into two areas;

A1 = ¹/₂ bh

A1 = ¹/₂ x (2) x (20)

A1 = 20 J

A2 = ¹/₂(large base + small base) x height

A2  = ¹/₂[(7 - 2) + (7-3)] x 50

A2 = ¹/₂(5 + 4) x 50

A2 = 225 J

W = A1 + A2

W = 20 J + 225 J

W = 245 J

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The planets orbit the sun due to gravitational force of the sun on them which keep it in their orbits.

The first law of motion is also called Law of Inertia, the second law of motion is the Law of Mass and Acceleration, and the Third Law of Motion that have action and reaction forces.

The gravity of the Sun keeps the planets in their orbits. They stay and revolve in their orbits because there is no other force in the Solar System which can put pressure on them.

So we can conclude that planets orbit the sun due to gravitational force of the sun on them which keep it in their orbits.

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Answer: Okay so I don't know much but from what I do know

Ultrasound emits sound waves into the body and what bounces back is what they can see the grey shape is what is closest. It's all micro sound waves and cannot hurt an unborn baby.

Explanation:

Not sure if this is correct but it is what I remember being told.

Hope this helps!

Answer:

ivory. ..................

Answer:

A burning candle emits radiation in the form of heat and light. The Sun emits radiation in the form of light, heat, and particles. Uranium-238 decaying into Thorium-234 emits radiation in the form ofalpha particles.

Answer:

the sun

Explanation:

the sun emits radiation

Answer:

B according to the picture

Explanation:

Star of 3 stellar masses => red supergiant=>supernova=>neutron star

Star of three stellar masses, red supergiant, supernova, neutron star are the star life cycle that is accurate. Therefore, the correct option is option B.

A star's life cycle is as follows: star formation inside a nebula, evolution into a sequence star, sustained nuclear fusion for a long time, exhaustion of fuel at some point, and gravitational core collapse with resulting high pressures and temperatures.

They typically consist of heated plasma held together by a strong gravitational force and are self-luminous. The thermonuclear process between helium and hydrogen that takes place in a star's core causes it to glow brilliantly. Star of three stellar masses, red supergiant, supernova, neutron star are the star life cycle that is accurate.

Therefore, the correct option is option B.

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friction is the force that resists the sliding or rolling of an object over another.

Answer: Simple Machines are useful and important because they reduce effort or extend the ability of people to form tasks beyond their normal capabilities . So they help us in our daily lives by reducing the amount of effort it takes for humans to perform certain tasks .

HOPE IT HELPS YOU .PLEASE GIVE BRAINLIEST .THANKS .

Answer:

The car and the road have kinetic friction.

Explanation:

Because the car is getting a force of friction because of the kinetic energy caused by the engine.

Answer: You take the biggest number and subtract it from the smallest number.

Explanation: Hope this helps.

Answer:

Subtract the minimum data value from the maximum data value to find the data range.

Explanation:

[tex]Hope[/tex] [tex]this[/tex] [tex]helps![/tex]

For a particle that has a velocity that is 70 % of the speed of light and weighs 206.8 times the mass of an electron, the wavelength of this particle is mathematically given as

W= 739.47

Generally, the equation for the 70 % of the speed of light  is mathematically given as

70% of 3x10^8 = 2.1x10^8 m/s

Therefore

206.8*9.11x10^-31 = 1.88x10^-28 kg

In conclusion, The wavelength equation isTThe

wavelength= plancks constant / (mass*velocity)

Where

Plancks constant = 6.62x10^-34 m^2 kg/s

W=6.62x10^-34 / (1.88x10^-28/2.1x10^8)

W= 739.47

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Answer:

Black holes:

A are the brightest objects in space.

B are the most well understood objects in space.

C pulse in a regular pattern.

D None of the choices are correct.

Explanation:

A black hole is a region of space where the pull of gravity is so strong that nothing can escape. It's a "hole" in the sense that things can fall in, but not out of it. It is "black" in the sense that not even light can escape.

I hope I helped you! :)

Answer:

[tex]7.2 \times 10 {}^{11} newton[/tex]

Explanation:

[tex]the \: magnitude \: of \: the \: forc \: e \: can \: be \: calculated \: using \: coulombs \: formular \\ f = \frac{k \times q1 \times q2}{d {}^{2} } \\ f = \frac{9 \times 10 {}^{9} \times 100 \times 20 }{5 {}^{2} } \\ f = \frac{18000 \times 10 {}^{9} }{25 } \\ f = \frac{18000000000000}{25} \\ f = 7.2 \times 10 {}^{11} newton[/tex]

The hazard from more material flows downhill are:

This is a condition which has the potential to cause damage or injury to a person or property.

Materials flowing downward means that there will erosion which may damage the roads, land for agriculture and utility poles.

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Hi there!

Recall Faraday's Law:

[tex]\epsilon = N\frac{d\Phi_B}{dt}[/tex]

ε = Induced emf (V)

N = Number of Loops

φ = Magnetic Flux (Wb)
t = time (s)

Thus, the induced emf is equivalent to the number of loops of the coil times the rate of change of the magnetic flux bounded by the area of the coil, so:

[tex]\epsilon = 2 \cdot \frac{47 - (-65)}{0.38} = 2 \cdot \frac{112}{0.38} = 589.47V =\boxed{ 5.9 \times 10^2 V}}[/tex]

**This is the magnitude of the induced emf. With Lenz's Law, however, the answer would be negative, which just indicates it is a resistive emf.

Answer:

9 x 10^1  km/hr  

Explanation:

25 m/s   x  3600 sec / hr   x  1km / 1000 m = 90 km/hr

For  the potential energy is converted to kinetic energy is mathematically given as

n=24.44%

Generally, the equation for the  potential energy  is mathematically given as

Ei=mgh

Ei=49.0\*9.81* 1.8

Ei=865.24J

Final total energy

K.E=0.5mv^2

K.E=0.5*49.0* (3.00)^2

K.E=211.5J

In conclusion, efficiency

n=Ef/Ei*100
n=211.5*865.24*100

n=24.44%

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Your answer will be A. Rescue breathing and chest compressions.