Can someone help me on no. 6

Answers

Answer 1

Answer:
Efficiency = (energy that does the job) / (total energy used)

= (45 J) / (120J)

I think you can handle the division.

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An airplane is flying at a constant velocity through the air. What is the relationship between the magnitudes of the four forces shown in the diagram? A. L = W; F < D
B. L = W; F = D
C. L = W = F = D
D. L = W; F > D

Answers

Answer:

(B) L=W; F=D

Explanation:

Since the airplane's velocity is constant, the airplane is not accelerating in any direction. In absence of acceleration, all forces acting on the plane are balanced so that the net forces in the horizontal and the vertical directions are zero. Given the drawing, this implies that

Forward force = Drag force (F=D)

Weight = Lift (W=L)

which corresponds to option (B)

(it is not C because nothing in the text says that the vertical and horizontal components have to have same magnitude)

Final answer:

The relationship between the magnitudes of the forces is that lift force is equal to weight force, and drag force is equal to thrust force.

Explanation:

In this scenario, the airplane is flying at a constant velocity, which means that its acceleration is zero. According to Newton's first law of motion, if an object is moving with a constant velocity, the net force acting on it is zero.

Therefore, the relationship between the magnitudes of the four forces shown in the diagram is that the lift force (L) is equal to the weight force (W), and the drag force (D) is equal to the thrust force (F).

So, the correct answer is C. L = W = F = D.

Learn more about Forces here:

brainly.com/question/13191643

#SPJ3

Answer this please. thanks in advance!! please tel me a christmas tree lights are set up in series1. a set of lights has 50 bulbs what will be the voltage across each bulb?
show your working out.

Answers

If 50 identical light bulbs are connected in series across
a single power source, then the voltage across each bulb
is ( 1/50 ) of the voltage delivered by the power source.

Presuming that this tree is connected into a mains power source in the UK. The total output of the UK mains source is 230V. So if we share this voltage equally between 50 bulbs:
$230V / 50 = 4.6V$

I'm not 100 per cent sure this is correct though and different countries may have different mains power supplies. Hope it helps anyway.

EDIT: This also does not take into account resistance in the bulbs and wires but is all I can tell you from the information provided in the question.

Please explain as if I am a 6 year old; why is time travel theoretically impossible?

Answers

Why exactly do you mean

Time travel would create paradoxes and history could be altered, resulting in something called the "butterfly effect". This means that even the smallest of changes can result in a HUGE difference. If you traveled back in time, you would interact with people and things. This would alter history, creating massive ripples in time. The movie "Back to the Future" and the new Harry Potter book have great examples of this. Hope I answered your question!

At sea level, water boils at 100 degrees celcius and methane boiled at -161 degrees celcius. Which of these substances has a stronger force of attraction between its particles? Explain your answer

Answers

Water has stronger force of attraction between its particles because methane is gas and its particles are further from itself.

I hope I helped

Answer:

Explanation:

How can working together help scientist achieve their goals?

Answers

When scientists work together it helps them achieve their goals when they share different ideas with eachother

The electromagnetic wave shown above is made of vibrating

Answers

The electromagnetic wave shown above is made up of vibrating Electric fields.

I assume this is why electromagnetic waves can travel through a vacuum, due to lack of matter.

Answer:

Electromagnetic waves are transverse waves that consist of a combined magnetic and electric effect.

Explanation:

wth :^)

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