with detailed explaniation

Answer:

893.8 [kJ].

Explanation:

1) the total heat can be calculated as

E=Q₁+Q₂+Q₃, where Q₁ - energy to heat the ice from -4 to 0; Q₂ - energy to melt the ice; Q₃ - to heat the water at 0 °C to 25 °C;

2) Q₁=λ*m*Δt₁, ⇒ Q₁=2100*2*4=16800 [J];

3) Q₂=c₂*m; ⇒ Q₂=333500*2=667000 [J];

3) Q₃=c₃*m*Δt₂; ⇒ Q₃=4200*2*25=210000 [j];

4) finally, the required heat is

E=16800+667000+210000=893800 [J]=893.8 [kJ].

a) The magnitude will be 0.838m

b) The displacement will be -17.35°

The path covered by an object from its initial point to final point.

Forces acting on the duck

x-axis:    0.13 + 0.16*cos(-56°) = 2.7 * ax  

ax = 0.0813 m/s^2

y-axis:    0.13*sin(-56°) = 2.7 * ay  

ay = -0.0491 m/s^2

The displacement on the x-axis

X = Vox * t + ax/2 * t²

X = 0.12* 3.2 + 0.0813/2*3.2²

X = 0.8

The displacement on the y-axis:

Y = Voy * t + ay/2 * t²

X = 0 - 0.0491/2*3.2²

Y=-0.25m

So, the magnitude and angle of this displacement [0.8,-0.25] is:

0.838m  at an angle of -17.35°

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Answer:

a its final velocity

Explanation:

Answer:

6.9m/s^2

Explanation:

100m/3.8=26.3m/s^2

Answer:

People used wind energy to propel boats along the Nile River as early as 5,000 BC. By 200 BC, simple wind-powered water pumps were used in China, and windmills with woven-reed blades were grinding grain in Persia and the Middle East.

Explanation:

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answer : input voltage = 377.143

steps:

Vout/Vin = Ns/Np

p = primary

s = secondary

primary and secondary voltages

are the same as

induced EMF

V is voltage

N is number of turns

output voltage / input voltage = secondary turns / primary turns

220/input voltage = 70 / 120

input voltage * 70 = 220 * 120

input voltage = (220 * 120)/70

input voltage = 377.143

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Socratic

quizlet

Answer:

Real images are obtained using a converging lens or a concave mirror. The size of the real image depends upon the placement of the object. A virtual image is an upright image that is achieved where the rays seem to diverge. A virtual image is produced with the help of a diverging lens or a convex mirror.

Answer:

Light rays actually pass through a real image.

Explanation:

Option C is somehow correct but the hurdle is that it's only for convex mirror

The concave mirror always produce a virtual image larger than object

So option D is correct

Answer:

1.21 or 1.2 acceleration

Explanation:

i think it is 50.0/41.0

which would equal 1.21(depending on if you round it)

Answer:

Thread

Explanation:

I made a powerpoint all about tools and things to use in woodwork.

Answer:

Friction is the resistance of motion when two objects rub against each other.

Explanation:

Hope this helps.

Answer:

B. A sharp

Explanation:

Answer:  S =  850 km/h = 235.11 m/s

Explanation:

average speed  = total distance : total time elapsed

           distance = 3400 km

           total time = 4 hours

average speed = D : T =  3400 km : 4 h = 850 km/h

[ 850 km /h = 850 000 m : 3600 s = 236.11 m/s ]

The resulting wave will have zero amplitude, thus it will form a straight line.

A crest is an upward displacement of a progressive wave.

A trough is a downward displacement of a progressive wave.

When the two waves meet each other at point X, they will superimpose and cancel out since they have equal amplitude and are in opposite direction.

The resulting wave will have zero amplitude, thus it will form a straight line.

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The net force acting on a box of mass 8.0kg that experiences an acceleration of 4.0m/s² is 32N. Details about net force can be found below.

The net force of a body can be calculated by multiplying the mass of the body by its acceleration as follows:

Force = mass × acceleration

According to this question, a box with a mass of 8.0 kg is sitting on a frictionless surface and experiences an acceleration of 4.0 m/s2 to the right.

Net force = 8kg × 4m/s²

Net force = 32N

Therefore, the net force acting on a box of mass 8.0kg that experiences an acceleration of 4.0m/s² is 32N.

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Answer: 32N

Explanation: Force= Mass*Acceleration

Force=8*4= 32N

Answer:

The kinetic energy is proportional to the square of the speed, so doubling the speed increases the kinetic energy by a factor of 4.

Strong nuclear and weak nuclear forces act only over short range distances.

Forces are agents which bring about a change in the state or motion of an object.

Forces can be described as pull or push agents.

Forces can either be contact or non-contact forces.

Some non-contact forces are gravitational forces and nuclear forces.

Nuclear forces act only over short range distances. Example are the strong and weak nuclear forces.

Therefore, strong nuclear and weak nuclear forces act only over short range distances.

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To push a box up an inclined plane, the force required is smaller if you push parallel to the incline.

This is also referred to as a ramp and is a flat surface which is tilted at an angle.

Pushing parallel to the plane doesn't generate friction which means a smaller amount of force will be required.

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We know By Einstein's Photoelectric Equation:

[tex]{:\implies \quad \sf h\nu =h\nu_{0}+\dfrac{1}{2}m{v^{2}}_{max}}[/tex]

[tex]{:\implies \quad \sf h\nu =h\nu_{0}+eV_{0}}[/tex]

[tex]{:\implies \quad \sf eV_{0}=h\nu -h\nu_{0}}[/tex]

[tex]{:\implies \quad \sf V_{0}=\dfrac{h\nu}{e}-\dfrac{h\nu_{0}}{e}}[/tex]

Since [tex]{\nu}[/tex] is plotted along X-axis and [tex]{V_0}[/tex] along Y-axis, it represents a straight line

(i) The slope of [tex]{V_{0}}[/tex] versus [tex]{\nu}[/tex] graph= (h/e) i.e it is a constant quantity and does not depend on the nature of the metal surface

(ii) The intercept on the [tex]{\nu}[/tex]-axis = [tex]{(h\nu_{0}/e)}[/tex] i.e it depends on the work function of the metal surface

Refer to the attachment for the graph

From the calculations, the acceleration of the elevator is obtained as 1.5m/s^2

The term acceleration has to do with the rate of change of velocity with time.

Given that;

u =  9.2 m/s

v = 15.8 m/s

t = 3.8

a = ?

The v = u + at

a = v - u/t

a = 15 - 9.2/3.8

a = 1.5m/s^2

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The most cited reason for the use of restraints on children that had the potential for fatality is: the prevention of of volatile or disturbing behavior that had the potential to cause injury.

The above research speaks to the use of restraints on children and seeks to highlight the fact that restraining children no matter the cause had, and continues to lead to the death of children numbered in their dozens.


The solution to this phenomena was that the sate of New York operates a service that caters to family and children and that over a space of five years, they were properly funded to train people on how to handle children.

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Angular speed

f is frequency

Area=36cm²=0.0036m²

Now

[tex]\\ \rm\Rrightarrow emf=nAB\omega[/tex]

[tex]\\ \rm\Rrightarrow 2.8=25\times 36\times 10^{-4}\times 376.8B[/tex]

[tex]\\ \rm\Rrightarrow 2.8=33.84B[/tex]

[tex]\\ \rm\Rrightarrow B=0.0827T[/tex]

[tex]\\ \rm\Rrightarrow 8.3\times 10^{-3}T[/tex]

The magnitude of acceleration of the elevator is 0.46m/s². Details on how to calculate magnitude of acceleration can be found below.

The magnitude of acceleration of the accelerator can be calculated by dividing the difference in force by the mass of the accelerator.

According to this question, a 5.0 kg box is sitting on a scale in an elevator. Before the elevator moves, the scale reads 49.05 N, however, when the elevator accelerates into motion, the scale momentarily reads 46.75 N.

Magnitude of acceleration = (49.05 - 46.75)/5

Magnitude of acceleration = 2.3/5

Magnitude of acceleration = 0.46m/s²

Therefore, the magnitude of acceleration of the elevator is 0.46m/s².

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Answer:

What interference occurs when two waves are out of phase?

Image result for ______ interference occurs when two waves are out of phase.

Destructive interference

Destructive interference occurs when the maxima of two waves are 180 degrees out of phase: a positive displacement of one wave is canceled exactly by a negative displacement of the other wave. The amplitude of the resulting wave is zero.

According to Newton's first law of motion, what happens to the ball is  the ball rolls backward.

This means that an object at rest or in motion will remain uniformly rectilinear and tend to be in that state if the net force on it is zero.

In this case, we have to think that the ball is at rest and the train is moving with a velocity that way, the reaction of the ball will be to go in the opposite direction to the motion.

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Answer:

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The coefficient of kinetic friction between the block and the incline is 0.168.

The coefficient of kinetic friction is determined from the principle of conservation of energy as follows;

distance traveled on the incline = L

L = h/sin35

L = 1.743 h

Since it takes twice the time travel down,

velocity to slide = 1.743 h/2t = 0.871 v

K.E of the block when it slides = ¹/₂mv₁²  = ¹/₂m(0.871v)² = 0.871²(K.E to fall) = 0.758K.E to fall straight down

1 - 0.758 = 0.24

μmgcos(35) = 0.24(mgsin(35)

μcos(35) = 0.24(sin(35)

μ = 0.168

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The apparatus consists of a hollow metal tube through which first tap water and then steam is passed. This process is accurate because it gives a result close to the required value. This is further explained below.

Generally, An experiment's accuracy is simply defined as the degree to which the final result is within the bounds of what is considered to be the accurate or approved value. As the distance decreases, so does the precision of the experiment.

In conclusion, Metal tubing, first filled with tap water, and subsequently steam, is used to create the device's steam. This method is accurate since it returns a value that is near to what is needed.

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Answer:

m³ is a derived unit because it is a product of three basic units. ( meters*meters*meters)